OVERVIEW: clang LLVM compiler
USAGE: clang-23 [options] file...
OPTIONS:
-### Print (but do not run) the commands to run for this compilation
--analyzer-output <value>
Static analyzer report output format (html|plist|plist-multi-file|plist-html|sarif|sarif-html|text).
--analyze Run the static analyzer
-B <prefix> Search $prefix$file for executables, libraries, and data files. If $prefix is a directory, search $prefix/$file
-b <arg> Pass -b <arg> to the linker on AIX
-CC Include comments from within macros in preprocessed output
-cl-denorms-are-zero OpenCL only. Allow denormals to be flushed to zero.
-cl-ext=<value> OpenCL only. Enable or disable OpenCL extensions/optional features. The argument is a comma-separated sequence of one or more extension names, each prefixed by '+' or '-'.
-cl-fast-relaxed-math OpenCL only. Sets -cl-finite-math-only and -cl-unsafe-math-optimizations, and defines __FAST_RELAXED_MATH__.
-cl-finite-math-only OpenCL only. Allow floating-point optimizations that assume arguments and results are not NaNs or +-Inf.
-cl-fp32-correctly-rounded-divide-sqrt
OpenCL only. Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded.
-cl-kernel-arg-info OpenCL only. Generate kernel argument metadata.
-cl-mad-enable OpenCL only. Allow use of less precise MAD computations in the generated binary.
-cl-no-signed-zeros OpenCL only. Allow use of less precise no signed zeros computations in the generated binary.
-cl-no-stdinc OpenCL only. Disables all standard includes containing non-native compiler types and functions.
-cl-opt-disable OpenCL only. This option disables all optimizations. By default optimizations are enabled.
-cl-single-precision-constant
OpenCL only. Treat double precision floating-point constant as single precision constant.
-cl-std=<value> OpenCL language standard to compile for.
-cl-strict-aliasing OpenCL only. This option is added for compatibility with OpenCL 1.0.
-cl-uniform-work-group-size
OpenCL only. Defines that the global work-size be a multiple of the work-group size specified to clEnqueueNDRangeKernel
-cl-unsafe-math-optimizations
OpenCL only. Allow unsafe floating-point optimizations. Also implies -cl-no-signed-zeros and -cl-mad-enable.
-clangir-disable-passes Disable CIR transformations pipeline
-clangir-disable-verifier
ClangIR: Disable MLIR module verifier
-clangir-enable-idiom-recognizer
ClangIR: Enable Idiom Recognizer pass
-clangir-lib-opt=<value>
Enable C/C++ library based optimizations (with options)
-clangir-lib-opt Enable C/C++ library based optimizations
--config=<file> Specify configuration file
--cstdlib=<value> C standard library to use
--cuda-compile-host-device
Compile CUDA code for both host and device (default). Has no effect on non-CUDA compilations.
--cuda-device-only Compile CUDA code for device only
--cuda-feature=<value> Manually specify the CUDA feature to use
--cuda-host-only Compile CUDA code for host only. Has no effect on non-CUDA compilations.
--cuda-include-ptx=<value>
Include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once.
--cuda-noopt-device-debug
Enable device-side debug info generation. Disables ptxas optimizations.
--cuda-path-ignore-env Ignore environment variables to detect CUDA installation
--cuda-path=<value> CUDA installation path
-cuid=<value> An ID for compilation unit, which should be the same for the same compilation unit but different for different compilation units. It is used to externalize device-side static variables for single source offloading languages CUDA and HIP so that they can be accessed by the host code of the same compilation unit.
-cxx-isystem <directory>
Add directory to the C++ SYSTEM include search path
-C Include comments in preprocessed output
-c Only run preprocess, compile, and assemble steps
-darwin-target-variant-triple <value>
Specify the darwin target variant triple
-darwin-target-variant <value>
Generate code for an additional runtime variant of the deployment target
-dD Print macro definitions in -E mode in addition to normal output
-dependency-dot <value> Filename to write DOT-formatted header dependencies to
-dependency-file <value>
Filename (or -) to write dependency output to
-dI Print include directives in -E mode in addition to normal output
-dM Print macro definitions in -E mode instead of normal output
-dsym-dir <dir> Directory to output dSYM's (if any) to
-dumpdir <dumppfx> Use <dumpfpx> as a prefix to form auxiliary and dump file names
-dumpmachine Display the compiler's target processor
-dumpversion Display the version of the compiler
-D <macro>=<value> Define <macro> to <value> (or 1 if <value> omitted)
--embed-dir=<dir> Add directory to embed search path
-emit-ast Emit Clang AST files for source inputs
-emit-cir Build ASTs and then lower to ClangIR
--emit-extension-symbol-graphs
Generate additional symbol graphs for extended modules.
-emit-interface-stubs Generate Interface Stub Files.
-emit-llvm Use the LLVM representation for assembler and object files
-emit-merged-ifs Generate Interface Stub Files, emit merged text not binary.
--emit-static-lib Enable linker job to emit a static library.
-emit-symbol-graph Generate Extract API information as a side effect of compilation.
--end-no-unused-arguments
Start emitting warnings for unused driver arguments
--extract-api-ignores=<value>
Comma separated list of files containing a new line separated list of API symbols to ignore when extracting API information.
-extract-api Extract API information
-E Only run the preprocessor
-faapcs-bitfield-load Follows the AAPCS standard that all volatile bit-field write generates at least one load. (ARM only).
-faapcs-bitfield-width Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only).
-faarch64-jump-table-hardening
Use hardened lowering for jump-table dispatch
-faddrsig Emit an address-significance table
-falign-loops=<N> N must be a power of two. Align loops to the boundary
-faligned-allocation Enable C++17 aligned allocation functions
-falloc-token-max=<N> Limit to maximum N allocation tokens (0 = target SIZE_MAX)
-fallow-editor-placeholders
Treat editor placeholders as valid source code
-fallow-runtime-check-skip-hot-cutoff=<value>
Exclude __builtin_allow_runtime_check for the top hottest code responsible for the given fraction of PGO counters (0.0 [default] = skip none; 1.0 = skip all). Argument format: <value>
-faltivec-src-compat=<value>
Source-level compatibility for Altivec vectors (for PowerPC targets). This includes results of vector comparison (scalar for 'xl', vector for 'gcc') as well as behavior when initializing with a scalar (splatting for 'xl', element zero only for 'gcc'). For 'mixed', the compatibility is as 'gcc' for 'vector bool/vector pixel' and as 'xl' for other types. Current default is 'mixed'.
-fansi-escape-codes Use ANSI escape codes for diagnostics
-fapinotes-modules Enable module-based external API notes support
-fapinotes-swift-version=<version>
Specify the Swift version to use when filtering API notes
-fapinotes Enable external API notes support
-fapple-kext Use Apple's kernel extensions ABI
-fapple-link-rtlib Force linking the clang builtins runtime library
-fapple-pragma-pack Enable Apple gcc-compatible #pragma pack handling
-fapplication-extension Restrict code to those available for App Extensions
-fapprox-func Allow certain math function calls to be replaced with an approximately equivalent calculation
-fassume-nothrow-exception-dtor
Assume that exception objects' destructors are non-throwing
-fasync-exceptions Enable EH Asynchronous exceptions
-fatomic-fine-grained-memory
May have atomic operations on fine-grained memory
-fatomic-ignore-denormal-mode
Allow atomic operations to ignore denormal mode
-fatomic-remote-memory May have atomic operations on remote memory
-fauto-import MinGW specific. Enable code generation support for automatic dllimport, and enable support for it in the linker. Enabled by default.
-fbasic-block-address-map
Emit the basic block address map section.
-fbasic-block-sections=<value>
Place each function's basic blocks in unique sections (ELF Only)
-fbinutils-version=<major.minor>
Produced object files can use all ELF features supported by this binutils version and newer. If -fno-integrated-as is specified, the generated assembly will consider GNU as support. 'none' means that all ELF features can be used, regardless of binutils support. Defaults to 2.26.
-fblocks Enable the 'blocks' language feature
-fborland-extensions Accept non-standard constructs supported by the Borland compiler
-fbuild-session-file=<file>
Use the last modification time of <file> as the build session timestamp
-fbuild-session-timestamp=<time since Epoch in seconds>
Time when the current build session started
-fbuiltin-module-map Load the clang builtins module map file.
-fc++-abi=<value> C++ ABI to use. This will override the target C++ ABI.
-fc++-static-destructors=<value>
Controls which variables C++ static destructors are registered for
-fcall-saved-x10 Make the x10 register call-saved (AArch64 only)
-fcall-saved-x11 Make the x11 register call-saved (AArch64 only)
-fcall-saved-x12 Make the x12 register call-saved (AArch64 only)
-fcall-saved-x13 Make the x13 register call-saved (AArch64 only)
-fcall-saved-x14 Make the x14 register call-saved (AArch64 only)
-fcall-saved-x15 Make the x15 register call-saved (AArch64 only)
-fcall-saved-x18 Make the x18 register call-saved (AArch64 only)
-fcall-saved-x8 Make the x8 register call-saved (AArch64 only)
-fcall-saved-x9 Make the x9 register call-saved (AArch64 only)
-fcaret-diagnostics-max-lines=<value>
Set the maximum number of source lines to show in a caret diagnostic (0 = no limit).
-fcf-protection=<value> Instrument control-flow architecture protection
-fcf-protection Enable cf-protection in 'full' mode
-fchar8_t Enable C++ builtin type char8_t
-fcheck-new Do not assume C++ operator new may not return NULL
-fclang-abi-compat=<version>
Attempt to match the ABI of Clang <version>
-fclangir Use the ClangIR pipeline to compile
-fcodegen-data-generate=<path>
Emit codegen data into the object file. LLD for MachO (currently) merges them into the specified <path>.
-fcodegen-data-generate Emit codegen data into the object file. LLD for MachO (currently) merges them into default.cgdata.
-fcodegen-data-use=<path>
Use codegen data read from the specified <path>.
-fcodegen-data-use Use codegen data read from default.cgdata to optimize the binary
-fcolor-diagnostics Enable colors in diagnostics
-fcomment-block-commands=<arg>
Treat each comma separated argument in <arg> as a documentation comment block command
-fcommon Place uninitialized global variables in a common block
-fcomplete-member-pointers
Require member pointer base types to be complete if they would be significant under the Microsoft ABI
-fcomplex-arithmetic=<value>
Controls the calculation methods of complex number multiplication and division.
-fconstant-nsarray-literals
Enable compile-time constant NSArray literals
-fconstant-nsdictionary-literals
Enable compile-time constant NSDictionary literals
-fconstant-nsnumber-literals
Enable compile-time constant NSNumber literals
-fconstexpr-backtrace-limit=<value>
Set the maximum number of entries to print in a constexpr evaluation backtrace (0 = no limit)
-fconstexpr-depth=<value>
Set the maximum depth of recursive constexpr function calls
-fconstexpr-steps=<value>
Set the maximum number of steps in constexpr function evaluation (0 = no limit)
-fconvergent-functions Assume all functions may be convergent.
-fcoro-aligned-allocation
Prefer aligned allocation for C++ Coroutines
-fcoroutines Enable support for the C++ Coroutines
-fcoverage-compilation-dir=<value>
The compilation directory to embed in the coverage mapping.
-fcoverage-mapping Generate coverage mapping to enable code coverage analysis
-fcoverage-mcdc Enable MC/DC criteria when generating code coverage
-fcoverage-prefix-map=<old>=<new>
remap file source paths <old> to <new> in coverage mapping. If there are multiple options, prefix replacement is applied in reverse order starting from the last one
-fcrash-diagnostics-dir=<dir>
Put crash-report files in <dir>
-fcrash-diagnostics-tar=<path>
Put crash-report tarball at <path>
-fcrash-diagnostics=<value>
Set level of crash diagnostic reporting, (option: off, compiler, all)
-fcrash-diagnostics Enable crash diagnostic reporting (default)
-fcs-profile-generate=<directory>
Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fcs-profile-generate Generate instrumented code to collect context sensitive execution counts into default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fcuda-short-ptr Use 32-bit pointers for accessing const/local/shared address spaces
-fcx-fortran-rules Range reduction is enabled for complex arithmetic operations.
-fcx-limited-range Basic algebraic expansions of complex arithmetic operations involving are enabled.
-fcxx-exceptions Enable C++ exceptions
-fcxx-modules Enable modules for C++
-fdata-sections Place each data in its own section
-fdebug-compilation-dir=<value>
The compilation directory to embed in the debug info
-fdebug-default-version=<value>
Default DWARF version to use, if a -g option caused DWARF debug info to be produced
-fdebug-info-for-profiling
Emit extra debug info to make sample profile more accurate
-fdebug-macro Emit macro debug information
-fdebug-prefix-map=<old>=<new>
For paths in debug info, remap directory <old> to <new>. If multiple options match a path, the last option wins
-fdebug-ranges-base-address
Use DWARF base address selection entries in .debug_ranges
-fdebug-record-sysroot Record the sysroot path in debug info as DW_AT_LLVM_sysroot and in DW_AT_LLVM_include_path (used by LLDB to locate the SDK for Clang module imports).
-fdebug-types-section Place debug types in their own section (ELF Only)
-fdeclspec Allow __declspec as a keyword
-fdefer-ts Enable support for the C '_Defer' Technical Specification
-fdefine-target-os-macros
Enable predefined target OS macros
-fdelayed-template-parsing
Parse templated function definitions at the end of the translation unit
-fdelete-null-pointer-checks
Treat usage of null pointers as undefined behavior (default)
-fdevirtualize-speculatively
Enables speculative devirtualization optimization.
-fdiagnostics-absolute-paths
Print absolute paths in diagnostics
-fdiagnostics-color=<value>
When to use colors in diagnostics
-fdiagnostics-hotness-threshold=<value>
Prevent optimization remarks from being output if they do not have at least this profile count. Use 'auto' to apply the threshold from profile summary
-fdiagnostics-misexpect-tolerance=<value>
Prevent misexpect diagnostics from being output if the profile counts are within N% of the expected.
-fdiagnostics-parseable-fixits
Print fix-its in machine parseable form
-fdiagnostics-print-source-range-info
Print source range spans in numeric form
-fdiagnostics-show-hotness
Enable profile hotness information in diagnostic line
-fdiagnostics-show-inlining-chain
Show inlining chain notes for [[gnu::warning/error]] diagnostics
-fdiagnostics-show-note-include-stack
Display include stacks for diagnostic notes
-fdiagnostics-show-option
Print option name with mappable diagnostics
-fdiagnostics-show-template-tree
Print a template comparison tree for differing templates
-fdigraphs Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default)
-fdirect-access-external-data
Don't use GOT indirection to reference external data symbols
-fdisable-block-signature-string
Disable block signature string)
-fdiscard-value-names Discard value names in LLVM IR
-fdollars-in-identifiers
Allow '$' in identifiers
-fdriver-only Only run the driver.
-fdwarf-exceptions Use DWARF style exceptions
-feliminate-unused-debug-types
Do not emit debug info for defined but unused types
-fembed-bitcode-marker Embed placeholder LLVM IR data as a marker
-fembed-bitcode=<option>
Embed LLVM bitcode
-fembed-bitcode Embed LLVM IR bitcode as data
-fembed-offload-object=<value>
Embed Offloading device-side binary into host object file as a section.
-femit-all-decls Emit all declarations, even if unused
-femit-compact-unwind-non-canonical
Try emitting Compact-Unwind for non-canonical entries. Maybe overridden by other constraints
-femit-dwarf-unwind=<value>
When to emit DWARF unwind (EH frame) info
-femulated-tls Use emutls functions to access thread_local variables
-fenable-matrix Enable matrix data type and related builtin functions
-fenable-new-pm-codegen Use the NewPM for the Codegen Pipeline
-fexceptions Enable support for exception handling
-fexcess-precision=<value>
Allows control over excess precision on targets where native support for the precision types is not available. By default, excess precision is used to calculate intermediate results following the rules specified in ISO C99.
-fexperimental-allow-pointer-field-protection-attr
Allow the use of the [[clang::pointer_field_protection]] attribute
-fexperimental-call-graph-section
Emit a call graph section
-fexperimental-late-parse-attributes
Enable experimental late parsing of attributes
-fexperimental-library Control whether unstable and experimental library features are enabled. This option enables various library features that are either experimental (also known as TSes), or have been but are not stable yet in the selected Standard Library implementation. It is not recommended to use this option in production code, since neither ABI nor API stability are guaranteed. This is intended to provide a preview of features that will ship in the future for experimentation purposes
-fexperimental-loop-fusion
EnableEnable the loop fusion pass
-fexperimental-openacc-macro-override <value>
Overrides the _OPENACC macro value for experimental testing during OpenACC support development
-fexperimental-pointer-field-protection-abi
Enable pointer field protection on all non-standard layout struct types
-fexperimental-pointer-field-protection-tagged
Use pointer identity (tag) to discriminate pointers of non-trivially-copyable types
-fexperimental-relative-c++-abi-vtables
Use the experimental C++ class ABI for classes with virtual tables
-fexperimental-sanitize-metadata-ignorelist=<value>
Disable sanitizer metadata for modules and functions that match the provided special case list
-fexperimental-sanitize-metadata=<value>
Specify the type of metadata to emit for binary analysis sanitizers
-fexperimental-strict-floating-point
Enables the use of non-default rounding modes and non-default exception handling on targets that are not currently ready.
-fextend-arguments=<value>
Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions
-fextend-variable-liveness=<value>
Extend the liveness of user variables through optimizations to prevent stale or optimized-out variable values when debugging.
-fextend-variable-liveness
Alias for -fextend-variable-liveness=all.
-ffast-math Allow aggressive, lossy floating-point optimizations
-ffat-lto-objects Enable fat LTO object support
-ffile-compilation-dir=<value>
The compilation directory to embed in the debug info and coverage mapping.
-ffile-prefix-map=<value>
remap file source paths in debug info, coverage mapping, predefined preprocessor macros and __builtin_FILE(). Implies -ffile-reproducible.
-ffile-reproducible Use the target's platform-specific path separator character when expanding the __FILE__ macro
-ffine-grained-bitfield-accesses
Use separate accesses for consecutive bitfield runs with legal widths and alignments.
-ffinite-loops Assume all non-trivial loops are finite.
-ffinite-math-only Allow floating-point optimizations that assume arguments and results are not NaNs or +-inf. This defines the \_\_FINITE\_MATH\_ONLY\_\_ preprocessor macro.
-ffixed-a0 Reserve the a0 register (M68k only)
-ffixed-a1 Reserve the a1 register (M68k only)
-ffixed-a2 Reserve the a2 register (M68k only)
-ffixed-a3 Reserve the a3 register (M68k only)
-ffixed-a4 Reserve the a4 register (M68k only)
-ffixed-a5 Reserve the a5 register (M68k only)
-ffixed-a6 Reserve the a6 register (M68k only)
-ffixed-d0 Reserve the d0 register (M68k only)
-ffixed-d1 Reserve the d1 register (M68k only)
-ffixed-d2 Reserve the d2 register (M68k only)
-ffixed-d3 Reserve the d3 register (M68k only)
-ffixed-d4 Reserve the d4 register (M68k only)
-ffixed-d5 Reserve the d5 register (M68k only)
-ffixed-d6 Reserve the d6 register (M68k only)
-ffixed-d7 Reserve the d7 register (M68k only)
-ffixed-edi Reserve the edi register (x86 only)
-ffixed-g1 Reserve the G1 register (SPARC only)
-ffixed-g2 Reserve the G2 register (SPARC only)
-ffixed-g3 Reserve the G3 register (SPARC only)
-ffixed-g4 Reserve the G4 register (SPARC only)
-ffixed-g5 Reserve the G5 register (SPARC only)
-ffixed-g6 Reserve the G6 register (SPARC only)
-ffixed-g7 Reserve the G7 register (SPARC only)
-ffixed-i0 Reserve the I0 register (SPARC only)
-ffixed-i1 Reserve the I1 register (SPARC only)
-ffixed-i2 Reserve the I2 register (SPARC only)
-ffixed-i3 Reserve the I3 register (SPARC only)
-ffixed-i4 Reserve the I4 register (SPARC only)
-ffixed-i5 Reserve the I5 register (SPARC only)
-ffixed-l0 Reserve the L0 register (SPARC only)
-ffixed-l1 Reserve the L1 register (SPARC only)
-ffixed-l2 Reserve the L2 register (SPARC only)
-ffixed-l3 Reserve the L3 register (SPARC only)
-ffixed-l4 Reserve the L4 register (SPARC only)
-ffixed-l5 Reserve the L5 register (SPARC only)
-ffixed-l6 Reserve the L6 register (SPARC only)
-ffixed-l7 Reserve the L7 register (SPARC only)
-ffixed-o0 Reserve the O0 register (SPARC only)
-ffixed-o1 Reserve the O1 register (SPARC only)
-ffixed-o2 Reserve the O2 register (SPARC only)
-ffixed-o3 Reserve the O3 register (SPARC only)
-ffixed-o4 Reserve the O4 register (SPARC only)
-ffixed-o5 Reserve the O5 register (SPARC only)
-ffixed-point Enable fixed point types
-ffixed-r10 Reserve the r10 register (Hexagon/x86_64 only)
-ffixed-r11 Reserve the r11 register (Hexagon/x86_64 only)
-ffixed-r12 Reserve the r12 register (Hexagon/x86_64 only)
-ffixed-r13 Reserve the r13 register (Hexagon/x86_64 only)
-ffixed-r14 Reserve the r14 register (Hexagon/x86_64 only)
-ffixed-r15 Reserve the r15 register (Hexagon/x86_64 only)
-ffixed-r16 Reserve the r16 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r17 Reserve the r17 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r18 Reserve the r18 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r19 Reserve register r19 (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r20 Reserve the r20 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r21 Reserve the r21 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r22 Reserve the r22 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r23 Reserve the r23 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r24 Reserve the r24 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r25 Reserve the r25 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r26 Reserve the r26 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r27 Reserve the r27 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r28 Reserve the r28 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r29 Reserve the r29 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r30 Reserve the r30 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r31 Reserve the r31 register (Hexagon/x86_64 only; x86_64 requires APX EGPR)
-ffixed-r6 Reserve register r6 (Hexagon only)
-ffixed-r7 Reserve register r7 (Hexagon only)
-ffixed-r8 Reserve the r8 register (Hexagon/x86_64 only)
-ffixed-r9 Reserve the r9 register (ARM/Hexagon/x86_64 only)
-ffixed-x10 Reserve the x10 register (AArch64/RISC-V only)
-ffixed-x11 Reserve the x11 register (AArch64/RISC-V only)
-ffixed-x12 Reserve the x12 register (AArch64/RISC-V only)
-ffixed-x13 Reserve the x13 register (AArch64/RISC-V only)
-ffixed-x14 Reserve the x14 register (AArch64/RISC-V only)
-ffixed-x15 Reserve the x15 register (AArch64/RISC-V only)
-ffixed-x16 Reserve the x16 register (RISC-V only)
-ffixed-x17 Reserve the x17 register (RISC-V only)
-ffixed-x18 Reserve the x18 register (AArch64/RISC-V only)
-ffixed-x19 Reserve the x19 register (RISC-V only)
-ffixed-x1 Reserve the x1 register (AArch64/RISC-V only)
-ffixed-x20 Reserve the x20 register (AArch64/RISC-V only)
-ffixed-x21 Reserve the x21 register (AArch64/RISC-V only)
-ffixed-x22 Reserve the x22 register (AArch64/RISC-V only)
-ffixed-x23 Reserve the x23 register (AArch64/RISC-V only)
-ffixed-x24 Reserve the x24 register (AArch64/RISC-V only)
-ffixed-x25 Reserve the x25 register (AArch64/RISC-V only)
-ffixed-x26 Reserve the x26 register (AArch64/RISC-V only)
-ffixed-x27 Reserve the x27 register (AArch64/RISC-V only)
-ffixed-x28 Reserve the x28 register (AArch64/RISC-V only)
-ffixed-x29 Reserve the x29 register (RISC-V only)
-ffixed-x2 Reserve the x2 register (AArch64/RISC-V only)
-ffixed-x30 Reserve the x30 register (RISC-V only)
-ffixed-x31 Reserve the x31 register (RISC-V only)
-ffixed-x3 Reserve the x3 register (AArch64/RISC-V only)
-ffixed-x4 Reserve the x4 register (AArch64/RISC-V only)
-ffixed-x5 Reserve the x5 register (AArch64/RISC-V only)
-ffixed-x6 Reserve the x6 register (AArch64/RISC-V only)
-ffixed-x7 Reserve the x7 register (AArch64/RISC-V only)
-ffixed-x8 Reserve the x8 register (RISC-V only)
-ffixed-x9 Reserve the x9 register (AArch64/RISC-V only)
-fforce-check-cxx20-modules-input-files
Check the input source files from C++20 modules explicitly
-fforce-dwarf-frame Always emit a debug frame section
-fforce-emit-vtables Emits more virtual tables to improve devirtualization
-fforce-enable-int128 Enable support for int128_t type
-ffp-contract=<value> Form fused FP ops (e.g. FMAs)
-ffp-eval-method=<value>
Specifies the evaluation method to use for floating-point arithmetic.
-ffp-exception-behavior=<value>
Specifies the exception behavior of floating-point operations.
-ffp-model=<value> Controls the semantics of floating-point calculations.
-ffreestanding Assert that the compilation takes place in a freestanding environment
-ffuchsia-api-level=<value>
Set Fuchsia API level
-ffunction-sections Place each function in its own section
-fglobal-isel Enables the global instruction selector
-fgnu-keywords Allow GNU-extension keywords regardless of language standard
-fgnu-runtime Generate output compatible with the standard GNU Objective-C runtime
-fgnu89-inline Use the gnu89 inline semantics
-fgnuc-version=<value> Sets various macros to claim compatibility with the given GCC version (default is 4.2.1)
-fgpu-allow-device-init Allow device side init function in HIP (experimental)
-fgpu-approx-transcendentals
Use approximate transcendental functions
-fgpu-default-stream=<value>
Specify default stream. The default value is 'legacy'. (CUDA/HIP only)
-fgpu-defer-diag Defer host/device related diagnostic messages for CUDA/HIP
-fgpu-flush-denormals-to-zero
Flush denormal floating point values to zero in CUDA/HIP device mode.
-fgpu-rdc Generate relocatable device code, also known as separate compilation mode
-fgpu-sanitize Enable sanitizer for supported offloading devices
-fheinous-gnu-extensions
(Deprecated) Controls whether '-Winvalid-gnu-asm-cast' defaults to an error or a warning
-fhip-emit-relocatable Compile HIP source to relocatable
-fhip-fp32-correctly-rounded-divide-sqrt
Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only)
-fhip-kernel-arg-name Specify that kernel argument names are preserved (HIP only)
-fhip-new-launch-api Use new kernel launching API for HIP
-fhlsl-strict-availability
Enables strict availability diagnostic mode for HLSL built-in functions.
-fhonor-infinities Specify that floating-point optimizations are not allowed that assume arguments and results are not +-inf.
-fhonor-nans Specify that floating-point optimizations are not allowed that assume arguments and results are not NANs.
-fignore-exceptions Enable support for ignoring exception handling constructs
-fimplicit-module-maps Implicitly search the file system for module map files.
-fimplicit-modules-lock-timeout=<seconds>
Time to wait on an implicit module lock before timing out
-fincremental-extensions
Enable incremental processing extensions such as processing statements on the global scope.
-finline-functions Inline suitable functions
-finline-hint-functions Inline functions which are (explicitly or implicitly) marked inline
-finline-max-stacksize=<value>
Suppress inlining of functions whose stack size exceeds the given value
-finput-charset=<value> Specify the default character set for source files
-finstrument-function-entry-bare
Instrument function entry only, after inlining, without arguments to the instrumentation call
-finstrument-functions-after-inlining
Like -finstrument-functions, but insert the calls after inlining
-finstrument-functions Generate calls to instrument function entry and exit
-fintegrated-as Enable the integrated assembler
-fintegrated-cc1 Run cc1 in-process
-fintegrated-objemitter Use internal machine object code emitter.
-fjmc Enable just-my-code debugging
-fjump-tables Use jump tables for lowering switches
-fkeep-persistent-storage-variables
Enable keeping all variables that have a persistent storage duration, including global, static and thread-local variables, to guarantee that they can be directly addressed
-fkeep-static-consts Keep static const variables even if unused
-fkeep-system-includes Instead of expanding system headers when emitting preprocessor output, preserve the #include directive. Useful when producing preprocessed output for test case reduction. May produce incorrect output if preprocessor symbols that control the included content (e.g. _XOPEN_SOURCE) are defined in the including source file. The portability of the resulting source to other compilation environments is not guaranteed.
Only valid with -E.
-flax-vector-conversions=<value>
Enable implicit vector bit-casts
-flifetime-dse Aggressively delete stores after the end of an object's lifetime
-floop-interchange Enable the loop interchange pass
-flto-jobs=<value> Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected)
-flto-partitions=<value>
Number of partitions to use for parallel full LTO codegen, ld.lld only.
-flto=auto Enable LTO in 'full' mode
-flto=jobserver Enable LTO in 'full' mode
-flto=<value> Set LTO mode
-flto Enable LTO in 'full' mode
-fmacro-backtrace-limit=<value>
Set the maximum number of entries to print in a macro expansion backtrace (0 = no limit)
-fmacro-prefix-map=<value>
remap file source paths in predefined preprocessor macros and __builtin_FILE(). Implies -ffile-reproducible.
-fmath-errno Require math functions to indicate errors by setting errno
-fmatrix-memory-layout=<value>
Sets the matrix memory layout (row-major or column-major)
-fmax-tokens=<value> Max total number of preprocessed tokens for -Wmax-tokens.
-fmax-type-align=<value>
Specify the maximum alignment to enforce on pointers lacking an explicit alignment
-fmemory-profile-use=<pathname>
Use memory profile for profile-guided memory optimization
-fmemory-profile=<directory>
Enable heap memory profiling and dump results into <directory>
-fmemory-profile Enable heap memory profiling
-fmerge-all-constants Allow merging of constants
-fmessage-length=<value>
Format message diagnostics so that they fit within N columns
-fminimize-whitespace Ignore the whitespace from the input file when emitting preprocessor output. It will only contain whitespace when necessary, e.g. to keep two minus signs from merging into to an increment operator. Useful with the -P option to normalize whitespace such that two files with only formatting changes are equal.
Only valid with -E on C-like inputs and incompatible with -traditional-cpp.
-fmodule-file-deps=<value>
Include module files in dependency output
-fmodule-file=[<name>=]<file>
Specify the mapping of module name to precompiled module file, or load a module file if name is omitted.
-fmodule-header=<kind> Build a C++20 Header Unit from a header that should be found in the user (fmodule-header=user) or system (fmodule-header=system) search path.
-fmodule-header Build a C++20 Header Unit from a header
-fmodule-map-file=<file>
Load this module map file
-fmodule-name=<name> Specify the name of the module to build
-fmodule-output=<value> Save intermediate module file results when compiling a standard C++ module unit.
-fmodule-output Save intermediate module file results when compiling a standard C++ module unit.
-fmodulemap-allow-subdirectory-search
Allow to search for module maps in subdirectories of search paths
-fmodules-cache-path=<directory>
Specify the module cache path
-fmodules-decluse Require declaration of modules used within a module
-fmodules-disable-diagnostic-validation
Disable validation of the diagnostic options when loading the module
-fmodules-driver Enable support for driver managed module builds (experimental)
-fmodules-embed-all-files<value>
Embed the contents of all files read by this compilation into the produced module file.
-fmodules-force-validate-user-headers
Force validation of user headers when repeatedly loading a module file within single build session
-fmodules-ignore-macro=<value>
Ignore the definition of the given macro when building and loading modules
-fmodules-prune-after=<seconds>
Specify the interval (in seconds) after which a module file will be considered unused
-fmodules-prune-interval=<seconds>
Specify the interval (in seconds) between attempts to prune the module cache
-fmodules-reduced-bmi Generate the reduced BMI
-fmodules-search-all Search even non-imported modules to resolve references
-fmodules-strict-decluse
Like -fmodules-decluse but requires all headers to be in modules
-fmodules-user-build-path <directory>
Specify the module user build path
-fmodules-validate-input-files-content
Validate PCM input files based on content if mtime differs
-fmodules-validate-once-per-build-session
Don't verify input files for the modules if the module has been successfully validated or loaded during this build session
-fmodules-validate-system-headers
Validate the system headers that a module depends on when loading the module
-fmodules Enable the 'modules' language feature
-fms-anonymous-structs Enable Microsoft anonymous struct/union extension.
-fms-compatibility-version=<value>
Dot-separated value representing the Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-fms-compatibility Enable full Microsoft Visual C++ compatibility
-fms-define-stdc Define '__STDC__' to '1' in MSVC Compatibility mode
-fms-extensions Accept some non-standard constructs supported by the Microsoft compiler
-fms-hotpatch Ensure that all functions can be hotpatched at runtime
-fms-runtime-lib=<value>
Select Windows run-time library
-fms-secure-hotpatch-functions-file=<value>
Path to a file that contains a list of mangled names of functions that should be hot-patched for Windows Secure Hot-Patching
-fms-secure-hotpatch-functions-list=<value>
List of mangled symbol names of functions that should be hot-patched for Windows Secure Hot-Patching
-fms-volatile Volatile loads and stores have acquire and release semantics
-fmsc-version=<value> Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-fnamed-loops Enable support for named loops
-fnew-alignment=<align> Specifies the largest alignment guaranteed by '::operator new(size_t)'
-fnew-infallible Enable treating throwing global C++ operator new as always returning valid memory (annotates with __attribute__((returns_nonnull)) and throw()). This is detectable in source.
-fno-aapcs-bitfield-width
Do not follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. (ARM only).
-fno-access-control Disable C++ access control
-fno-addrsig Don't emit an address-significance table
-fno-apinotes-modules Disable module-based external API notes support
-fno-apinotes Disable external API notes support
-fno-assume-sane-operator-new
Don't assume that C++'s global operator new can't alias any pointer
-fno-assume-unique-vtables
Disable optimizations based on vtable pointer identity
-fno-assumptions Disable codegen and compile-time checks for C++23's [[assume]] attribute
-fno-atomic-fine-grained-memory
Assume no atomic operations on fine-grained memory
-fno-atomic-ignore-denormal-mode
Disallow atomic operations to ignore denormal mode
-fno-atomic-remote-memory
Assume no atomic operations on remote memory
-fno-auto-import MinGW specific. Disable support for automatic dllimport in code generation and linking
-fno-autolink Disable generation of linker directives for automatic library linking
-fno-builtin-<value> Disable implicit builtin knowledge of a specific function
-fno-builtin Disable implicit builtin knowledge of functions
-fno-c++-static-destructors
Disable C++ static destructor registration
-fno-char8_t Disable C++ builtin type char8_t
-fno-clangir Use the AST -> LLVM pipeline to compile
-fno-color-diagnostics Disable colors in diagnostics
-fno-common Compile common globals like normal definitions
-fno-complete-member-pointers
Do not require member pointer base types to be complete if they would be significant under the Microsoft ABI
-fno-constant-cfstrings Disable creation of CodeFoundation-type constant strings
-fno-constant-nsarray-literals
Disable compile-time constant NSArray literals
-fno-constant-nsdictionary-literals
Disable compile-time constant NSDictionary literals
-fno-constant-nsnumber-literals
Disable compile-time constant NSNumber literals
-fno-coverage-mapping Disable code coverage analysis
-fno-coverage-mcdc Disable MC/DC coverage criteria
-fno-crash-diagnostics Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash
-fno-cx-fortran-rules Range reduction is disabled for complex arithmetic operations
-fno-cx-limited-range Basic algebraic expansions of complex arithmetic operations involving are disabled.
-fno-cxx-modules Disable modules for C++
-fno-debug-macro Do not emit macro debug information
-fno-debug-record-sysroot
Scrub the sysroot path from debug info.
-fno-declspec Disallow __declspec as a keyword
-fno-define-target-os-macros
Disable predefined target OS macros
-fno-delayed-template-parsing
Disable delayed template parsing
-fno-delete-null-pointer-checks
Do not treat usage of null pointers as undefined behavior
-fno-diagnostics-fixit-info
Do not include fixit information in diagnostics
-fno-diagnostics-show-line-numbers
Show line numbers in diagnostic code snippets
-fno-digraphs Disallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:'
-fno-direct-access-external-data
Use GOT indirection to reference external data symbols
-fno-disable-block-signature-string
Don't disable block signature string)
-fno-discard-value-names
Do not discard value names in LLVM IR
-fno-dollars-in-identifiers
Disallow '$' in identifiers
-fno-elide-constructors Disable C++ copy constructor elision
-fno-elide-type Do not elide types when printing diagnostics
-fno-eliminate-unused-debug-types
Emit debug info for defined but unused types
-fno-enable-new-pm-codegen
Do not use the NewPM for the Codegen Pipeline
-fno-exceptions Disable support for exception handling
-fno-experimental-allow-pointer-field-protection-attr
Disallow the use of the [[clang::pointer_field_protection]] attribute
-fno-experimental-late-parse-attributes
Disable experimental late parsing of attributes
-fno-experimental-loop-fusion
DisableEnable the loop fusion pass
-fno-experimental-pointer-field-protection-abi
Do not enable pointer field protection on all non-standard layout struct types
-fno-experimental-pointer-field-protection-tagged
Do not use pointer identity (tag) to discriminate pointers of non-trivially-copyable types
-fno-experimental-relative-c++-abi-vtables
Do not use the experimental C++ class ABI for classes with virtual tables
-fno-experimental-sanitize-metadata=<value>
Disable emitting metadata for binary analysis sanitizers
-fno-fat-lto-objects Disable fat LTO object support
-fno-file-reproducible Use the host's platform-specific path separator character when expanding the __FILE__ macro
-fno-fine-grained-bitfield-accesses
Use large-integer access for consecutive bitfield runs.
-fno-finite-loops Do not assume that any loop is finite.
-fno-fixed-point Disable fixed point types
-fno-force-enable-int128
Disable support for int128_t type
-fno-global-isel Disables the global instruction selector
-fno-gnu-inline-asm Disable GNU style inline asm
-fno-gpu-allow-device-init
Don't allow device side init function in HIP (experimental)
-fno-gpu-approx-transcendentals
Don't use approximate transcendental functions
-fno-gpu-defer-diag Don't defer host/device related diagnostic messages for CUDA/HIP
-fno-hip-emit-relocatable
Do not override toolchain to compile HIP source to relocatable
-fno-hip-fp32-correctly-rounded-divide-sqrt
Don't specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only)
-fno-hip-kernel-arg-name
Don't specify that kernel argument names are preserved (HIP only)
-fno-hip-new-launch-api Don't use new kernel launching API for HIP
-fno-integrated-as Disable the integrated assembler
-fno-integrated-cc1 Spawn a separate process for each cc1
-fno-integrated-objemitter
Use external machine object code emitter.
-fno-jump-tables Do not use jump tables for lowering switches
-fno-keep-persistent-storage-variables
Disable keeping all variables that have a persistent storage duration, including global, static and thread-local variables, to guarantee that they can be directly addressed
-fno-keep-static-consts Don't keep static const variables even if unused
-fno-knr-functions Disable support for K&R C function declarations
-fno-lifetime-dse Do not aggressively delete stores after the end of an object's lifetime
-fno-loop-interchange Disable the loop interchange pass
-fno-lto Disable LTO mode (default)
-fno-memory-profile Disable heap memory profiling
-fno-merge-all-constants
Disallow merging of constants
-fno-modules-driver Disable support for driver managed module builds (experimental)
-fno-modules-force-validate-user-headers
Do not force validation of user headers when repeatedly loading a module file within single build session
-fno-modules-validate-textual-header-includes
Do not enforce -fmodules-decluse and private header restrictions for textual headers. This flag will be removed in a future Clang release.
-fno-ms-anonymous-structs
Disable Microsoft anonymous struct/union extension.
-fno-ms-tls-guards Do not emit code to perform on-demand initialization of thread-local variables
-fno-new-infallible Disable treating throwing global C++ operator new as always returning valid memory (annotates with __attribute__((returns_nonnull)) and throw()). This is detectable in source.
-fno-objc-avoid-heapify-local-blocks
Don't try to avoid heapifying local blocks
-fno-objc-constant-literals
Disable compile-time constant ObjC literals
-fno-objc-infer-related-result-type
do not infer Objective-C related result type based on method family
-fno-offload-lto Disable LTO mode (default) for offload compilation
-fno-offload-uniform-block
Don't assume that kernels are launched with uniform block sizes (default true for CUDA/HIP and false otherwise)
-fno-offload-via-llvm Don't use LLVM/Offload as portable offloading runtime.
-fno-openmp-extensions Disable all Clang extensions for OpenMP directives and clauses
-fno-openmp-simd Do not emit code for any OpenMP constructs.
-fno-operator-names Do not treat C++ operator name keywords as synonyms for operators
-fno-optimize-sibling-calls
Disable tail call optimization, keeping the call stack accurate
-fno-partition-static-data-sections
Disable partition static data sections using PGO profile information and MemProf (x86 and aarch64 ELF). See LLVM MemProf doc for usage.
-fno-pch-codegen Do not generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
-fno-pch-debuginfo Do not generate debug info for types in an object file built from this PCH and do not generate them elsewhere
-fno-plt Use GOT indirection instead of PLT to make external function calls (x86 only)
-fno-preserve-as-comments
Do not preserve comments in inline assembly
-fno-profile-generate Disable generation of profile instrumentation.
-fno-profile-instr-generate
Disable generation of profile instrumentation.
-fno-profile-instr-use Disable using instrumentation data for profile-guided optimization
-fno-pseudo-probe-for-profiling
Do not emit pseudo probes for sample profiling
-fno-raw-string-literals
Disable raw string literals
-fno-register-global-dtors-with-atexit
Don't use atexit or __cxa_atexit to register global destructors
-fno-rtlib-add-rpath Do not add -rpath with architecture-specific resource directory to the linker flags. When --hip-link is specified, do not add -rpath with HIP runtime library directory to the linker flags
-fno-rtlib-defaultlib On Windows, do not emit /defaultlib: directives to link compiler-rt libraries
-fno-rtti-data Disable generation of RTTI data
-fno-rtti Disable generation of rtti information
-fno-sanitize-address-globals-dead-stripping
Disable linker dead stripping of globals in AddressSanitizer
-fno-sanitize-address-outline-instrumentation
Use default code inlining logic for the address sanitizer
-fno-sanitize-address-poison-custom-array-cookie
Disable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fno-sanitize-address-use-after-scope
Disable use-after-scope detection in AddressSanitizer
-fno-sanitize-address-use-odr-indicator
Disable ODR indicator globals
-fno-sanitize-alloc-token-extended
Disable extended coverage to custom allocation functions
-fno-sanitize-alloc-token-fast-abi
Use the default AllocToken ABI
-fno-sanitize-annotate-debug-info=<value>
Do not allow compiler to annotate sanitizer instrumentation with extra debug info for the specified sanitizers
-fno-sanitize-annotate-debug-info
Do not allow compiler to annotate sanitizer instrumentation with extra debug info for any sanitizers
-fno-sanitize-cfi-canonical-jump-tables
Do not make the jump table addresses canonical in the symbol table
-fno-sanitize-cfi-cross-dso
Disable control flow integrity (CFI) checks for cross-DSO calls.
-fno-sanitize-coverage=<value>
Disable features of coverage instrumentation for Sanitizers
-fno-sanitize-debug-trap-reasons
Alias for -fsanitize-debug-trap-reasons=none
-fno-sanitize-handler-preserve-all-regs
Disable handlers with preserve_all calling convention
-fno-sanitize-hwaddress-experimental-aliasing
Disable aliasing mode in HWAddressSanitizer
-fno-sanitize-ignorelist
Don't use ignorelist file for sanitizers
-fno-sanitize-memory-param-retval
Disable detection of uninitialized parameters and return values
-fno-sanitize-memory-track-origins
Disable origins tracking in MemorySanitizer
-fno-sanitize-memory-use-after-dtor
Disable use-after-destroy detection in MemorySanitizer
-fno-sanitize-merge=<value>
Do not allow compiler to merge handlers for specified sanitizers
-fno-sanitize-merge Do not allow compiler to merge handlers for any sanitizers
-fno-sanitize-recover=<value>
Disable recovery for specified sanitizers
-fno-sanitize-stable-abi
Conventional ABI instrumentation for sanitizer runtime. Default: Conventional
-fno-sanitize-stats Disable sanitizer statistics gathering.
-fno-sanitize-thread-atomics
Disable atomic operations instrumentation in ThreadSanitizer
-fno-sanitize-thread-func-entry-exit
Disable function entry/exit instrumentation in ThreadSanitizer
-fno-sanitize-thread-memory-access
Disable memory access instrumentation in ThreadSanitizer
-fno-sanitize-trap-loop Do not use infinite loops in trapping mode
-fno-sanitize-trap=<value>
Disable trapping for specified sanitizers
-fno-sanitize-trap Disable trapping for all sanitizers
-fno-sanitize-type-outline-instrumentation
Use code inlining logic for the type sanitizer
-fno-short-wchar Force wchar_t to be an unsigned int
-fno-show-column Do not include column number on diagnostics
-fno-show-source-location
Do not include source location information with diagnostics
-fno-signed-char char is unsigned
-fno-signed-zeros Allow optimizations that ignore the sign of floating point zeros
-fno-skip-odr-check-in-gmf
Perform ODR checks for decls in the global module fragment.
-fno-spell-checking Disable spell-checking
-fno-split-machine-functions
Disable late function splitting using profile information (x86 and aarch64 ELF)
-fno-split-stack Wouldn't use segmented stack
-fno-stack-clash-protection
Disable stack clash protection
-fno-stack-protector Disable the use of stack protectors
-fno-standalone-debug Limit debug information produced to reduce size of debug binary
-fno-strict-aliasing Disable optimizations based on strict aliasing rules
-fno-strict-bool=<value>
Disable optimizations based on bool bit patterns never being anything other than 0 or 1, specifying a conversion behavior.
-fno-strict-bool Disable optimizations based on bool bit patterns never being anything other than 0 or 1
-fno-strict-float-cast-overflow
Relax language rules and try to match the behavior of the target's native float-to-int conversion instructions
-fno-strict-return Don't treat control flow paths that fall off the end of a non-void function as unreachable
-fno-swift-version-independent-apinotes
Disable version-independent external API notes support
-fno-sycl Disable SYCL C++ extensions
-fno-temp-file Directly create compilation output files. This may lead to incorrect incremental builds if the compiler crashes
-fno-threadsafe-statics Do not emit code to make initialization of local statics thread safe
-fno-trigraphs Do not process trigraph sequences
-fno-unified-lto Use distinct LTO pipelines
-fno-unique-section-names
Don't use unique names for text and data sections
-fno-unroll-loops Turn off loop unroller
-fno-use-cxa-atexit Don't use __cxa_atexit for calling destructors
-fno-use-init-array Use .ctors/.dtors instead of .init_array/.fini_array
-fno-verify-intermediate-code
Disable verification of LLVM IR
-fno-visibility-inlines-hidden-static-local-var
Disables -fvisibility-inlines-hidden-static-local-var (this is the default on non-darwin targets)
-fno-xray-function-index
Omit function index section at the expense of single-function patching performance
-fno-zero-initialized-in-bss
Don't place zero initialized data in BSS
-fno-zos-extensions Do not accept non-standard constructs supported by the z/OS compiler
-fobjc-arc-exceptions Use EH-safe code when synthesizing retains and releases in -fobjc-arc
-fobjc-arc Synthesize retain and release calls for Objective-C pointers
-fobjc-avoid-heapify-local-blocks
Try to avoid heapifying local blocks
-fobjc-constant-literals
Enable compile-time constant ObjC literals
-fobjc-direct-precondition-thunk
Move precondition checks for direct methods into thunks
-fobjc-disable-direct-methods-for-testing
Ignore attribute objc_direct so that direct methods can be tested
-fobjc-encode-cxx-class-template-spec
Fully encode c++ class template specialization
-fobjc-exceptions Enable Objective-C exceptions
-fobjc-runtime=<value> Specify the target Objective-C runtime kind and version
-fobjc-weak Enable ARC-style weak references in Objective-C
-foffload-implicit-host-device-templates
Template functions or specializations without host, device and global attributes have implicit host device attributes (CUDA/HIP only)
-foffload-lto=<value> Set LTO mode for offload compilation
-foffload-lto Enable LTO in 'full' mode for offload compilation
-foffload-uniform-block Assume that kernels are launched with uniform block sizes (default true for CUDA/HIP and false otherwise)
-foffload-via-llvm Use LLVM/Offload as portable offloading runtime.
-fomit-frame-pointer Omit the frame pointer from functions that don't need it. Some stack unwinding cases, such as profilers and sanitizers, may prefer specifying -fno-omit-frame-pointer. On many targets, -O1 and higher omit the frame pointer by default. -m[no-]omit-leaf-frame-pointer takes precedence for leaf functions
-fopenacc Enable OpenACC
-fopenmp-extensions Enable all Clang extensions for OpenMP directives and clauses
-fopenmp-force-usm Force behavior as if the user specified pragma omp requires unified_shared_memory.
-fopenmp-offload-mandatory
Do not create a host fallback if offloading to the device fails.
-fopenmp-simd Emit OpenMP code only for SIMD-based constructs.
-fopenmp-target-debug Enable debugging in the OpenMP offloading device RTL
-fopenmp-target-jit Emit code that can be JIT compiled for OpenMP offloading. Implies -foffload-lto=full
-fopenmp-targets=<value>
Specify comma-separated list of triples OpenMP offloading targets to be supported
-fopenmp-version=<value>
Set OpenMP version (e.g. 45 for OpenMP 4.5, 51 for OpenMP 5.1). Default value is 51 for Clang
-fopenmp Parse OpenMP pragmas and generate parallel code.
-foperator-arrow-depth=<value>
Maximum number of 'operator->'s to call for a member access
-foptimization-record-file=<file>
Specify the output name of the file containing the optimization remarks. Implies -fsave-optimization-record. On Darwin platforms, this cannot be used with multiple -arch <arch> options.
-foptimization-record-passes=<regex>
Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes)
-fpack-struct=<value> Specify the default maximum struct packing alignment
-fpartition-static-data-sections
Enable partition static data sections using PGO profile information and MemProf (x86 and aarch64 ELF). See LLVM MemProf doc for usage.
-fpascal-strings Recognize and construct Pascal-style string literals
-fpass-plugin=<dsopath> Load pass plugin from a dynamic shared object file (only with new pass manager).
-fpatchable-function-entry=<N,M,Section>
Generate M NOPs before function entry and N-M NOPs after function entry. If section is specified, use it instead of __patchable_function_entries.
-fpcc-struct-return Override the default ABI to return all structs on the stack
-fpch-codegen Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH
-fpch-debuginfo Generate debug info for types in an object file built from this PCH and do not generate them elsewhere
-fpch-instantiate-templates
Instantiate templates already while building a PCH
-fpch-validate-input-files-content
Validate PCH input files based on content if mtime differs
-fplugin-arg-<name>-<arg>
Pass <arg> to plugin <name>
-fplugin=<dsopath> Load the named plugin (dynamic shared object)
-fprebuilt-implicit-modules
Look up implicit modules in the prebuilt module path
-fprebuilt-module-path=<directory>
Specify the prebuilt module path
-fpreferred-function-alignment=<value>
preferred alignment for functions
-fproc-stat-report=<value>
Save subprocess statistics to the given file
-fproc-stat-report<value>
Print subprocess statistics
-fprofile-arcs Instrument code to produce gcov data files (*.gcda)
-fprofile-continuous Enable continuous instrumentation profiling mode
-fprofile-exclude-files=<value>
Instrument only functions from files where names don't match all the regexes separated by a semi-colon
-fprofile-filter-files=<value>
Instrument only functions from files where names match any regex separated by a semi-colon
-fprofile-function-groups=<N>
Partition functions into N groups and select only functions in group i to be instrumented using -fprofile-selected-function-group
-fprofile-generate-cold-function-coverage=<directory>
Generate instrumented code to collect coverage info for cold functions into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fprofile-generate-cold-function-coverage
Generate instrumented code to collect coverage info for cold functions into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
-fprofile-generate=<directory>
Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fprofile-generate Generate instrumented code to collect execution counts into default.profraw (overridden by LLVM_PROFILE_FILE env var)
-fprofile-instr-generate=<file>
Generate instrumented code to collect execution counts into <file> (overridden by LLVM_PROFILE_FILE env var)
-fprofile-instr-generate
Generate instrumented code to collect execution counts into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
-fprofile-instr-use=<value>
Use instrumentation data for profile-guided optimization
-fprofile-list=<value> Filename defining the list of functions/files to instrument. The file uses the sanitizer special case list format.
-fprofile-remapping-file=<file>
Use the remappings described in <file> to match the profile data against names in the program
-fprofile-sample-accurate
Specifies that the sample profile is accurate
-fprofile-sample-use=<value>
Enable sample-based profile guided optimizations
-fprofile-selected-function-group=<i>
Partition functions into N groups using -fprofile-function-groups and select only functions in group i to be instrumented. The valid range is 0 to N-1 inclusive
-fprofile-update=<method>
Set update method of profile counters
-fprofile-use=<pathname>
Use instrumentation data for profile-guided optimization. If pathname is a directory, it reads from <pathname>/default.profdata. Otherwise, it reads from file <pathname>.
-fprotect-parens Determines whether the optimizer honors parentheses when floating-point expressions are evaluated
-fpseudo-probe-for-profiling
Emit pseudo probes for sample profiling
-fptrauth-auth-traps Enable traps on authentication failures
-fptrauth-block-descriptor-pointers
Enable signing and authentication of block descriptors
-fptrauth-calls Enable signing and authentication of all indirect calls
-fptrauth-elf-got Enable authentication of pointers from GOT (ELF only)
-fptrauth-function-pointer-type-discrimination
Enable type discrimination on C function pointers
-fptrauth-indirect-gotos
Enable signing and authentication of indirect goto targets
-fptrauth-init-fini-address-discrimination
Enable address discrimination of function pointers in init/fini arrays
-fptrauth-init-fini Enable signing of function pointers in init/fini arrays
-fptrauth-intrinsics Enable pointer authentication intrinsics
-fptrauth-objc-class-ro Enable signing and authentication for ObjC class_ro pointers
-fptrauth-objc-interface-sel
Enable signing and authentication of Objective-C object's 'SEL' fields
-fptrauth-objc-isa Enable signing and authentication of Objective-C object's 'isa' field
-fptrauth-returns Enable signing and authentication of return addresses
-fptrauth-type-info-vtable-pointer-discrimination
Enable type and address discrimination of vtable pointer of std::type_info
-fptrauth-vtable-pointer-address-discrimination
Enable address discrimination of vtable pointers
-fptrauth-vtable-pointer-type-discrimination
Enable type discrimination of vtable pointers
-frandomize-layout-seed-file=<file>
File holding the seed used by the randomize structure layout feature
-frandomize-layout-seed=<seed>
The seed used by the randomize structure layout feature
-fraw-string-literals Enable raw string literals
-freciprocal-math Allow division operations to be reassociated
-freflection Enable C++26 reflection
-freg-struct-return Override the default ABI to return small structs in registers
-fregister-global-dtors-with-atexit
Use atexit or __cxa_atexit to register global destructors
-fropi Generate read-only position independent code (ARM only)
-frtlib-add-rpath Add -rpath with architecture-specific resource directory to the linker flags. When --hip-link is specified, also add -rpath with HIP runtime library directory to the linker flags
-frtlib-defaultlib On Windows, emit /defaultlib: directives to link compiler-rt libraries (default)
-frwpi Generate read-write position independent code (ARM only)
-fsafe-buffer-usage-suggestions
Display suggestions to update code associated with -Wunsafe-buffer-usage warnings
-fsample-profile-use-profi
Use profi to infer block and edge counts
-fsanitize-address-destructor=<value>
Set the kind of module destructors emitted by AddressSanitizer instrumentation. These destructors are emitted to unregister instrumented global variables when code is unloaded (e.g. via `dlclose()`).
-fsanitize-address-field-padding=<value>
Level of field padding for AddressSanitizer
-fsanitize-address-globals-dead-stripping
Enable linker dead stripping of globals in AddressSanitizer
-fsanitize-address-outline-instrumentation
Always generate function calls for address sanitizer instrumentation
-fsanitize-address-poison-custom-array-cookie
Enable poisoning array cookies when using custom operator new[] in AddressSanitizer
-fsanitize-address-use-after-return=<mode>
Select the mode of detecting stack use-after-return in AddressSanitizer
-fsanitize-address-use-after-scope
Enable use-after-scope detection in AddressSanitizer
-fsanitize-address-use-odr-indicator
Enable ODR indicator globals to avoid false ODR violation reports in partially sanitized programs at the cost of an increase in binary size
-fsanitize-alloc-token-extended
Enable extended coverage to custom allocation functions
-fsanitize-alloc-token-fast-abi
Use the AllocToken fast ABI
-fsanitize-annotate-debug-info=<value>
Annotate sanitizer instrumentation with extra debug info for the specified sanitizers, if supported
-fsanitize-annotate-debug-info
Allow compiler to annotate sanitizer instrumentation with extra debug info for all sanitizers, where supported
-fsanitize-cfi-canonical-jump-tables
Make the jump table addresses canonical in the symbol table
-fsanitize-cfi-cross-dso
Enable control flow integrity (CFI) checks for cross-DSO calls.
-fsanitize-cfi-icall-experimental-normalize-integers
Normalize integers in CFI indirect call type signature checks
-fsanitize-cfi-icall-generalize-pointers
Generalize pointers in CFI indirect call type signature checks
-fsanitize-coverage-allowlist=<value>
Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones
-fsanitize-coverage-ignorelist=<value>
Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones
-fsanitize-coverage-stack-depth-callback-min=<M>
Use callback for max stack depth tracing with minimum stack depth M
-fsanitize-coverage=<value>
Specify the type of coverage instrumentation for Sanitizers
-fsanitize-debug-trap-reasons=<value>
Set how trap reasons are emitted. `none` - Not emitted. This gives the smallest debug info; `basic` - Emit a fixed trap message per check type. This increases the debug info size but not as much as `detailed`; `detailed` - Emit a more detailed trap message. This increases the debug info size the most. Default is `detailed`.
-fsanitize-debug-trap-reasons
Alias for -fsanitize-debug-trap-reasons=detailed
-fsanitize-handler-preserve-all-regs
Enable handlers with preserve_all calling convention
-fsanitize-hwaddress-abi=<value>
Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). This option is currently unused.
-fsanitize-hwaddress-experimental-aliasing
Enable aliasing mode in HWAddressSanitizer
-fsanitize-ignore-for-ubsan-feature=<check>
Prevents `__has_feature(undefined_behavior_sanitizer)` from evaluating true for these UBSan checks. See user manual for available UBSan checks
-fsanitize-ignorelist=<value>
Path to ignorelist file for sanitizers
-fsanitize-kcfi-arity Embed function arity information into the KCFI patchable function prefix
-fsanitize-kcfi-hash=<value>
Select hash algorithm for KCFI type IDs (xxHash64, FNV-1a)
-fsanitize-memory-param-retval
Enable detection of uninitialized parameters and return values
-fsanitize-memory-track-origins=<value>
Enable origins tracking in MemorySanitizer
-fsanitize-memory-track-origins
Enable origins tracking in MemorySanitizer
-fsanitize-memory-use-after-dtor
Enable use-after-destroy detection in MemorySanitizer
-fsanitize-memtag-mode=<value>
Set default MTE mode to 'sync' (default) or 'async'
-fsanitize-merge=<value>
Allow compiler to merge handlers for specified sanitizers
-fsanitize-merge Allow compiler to merge handlers for all sanitizers
-fsanitize-recover=<value>
Enable recovery for specified sanitizers
-fsanitize-skip-hot-cutoff=<value>
Exclude sanitization for the top hottest code responsible for the given fraction of PGO counters (0.0 [default] = skip none; 1.0 = skip all). Argument format: <sanitizer1>=<value1>,<sanitizer2>=<value2>,...
-fsanitize-stable-abi Stable ABI instrumentation for sanitizer runtime. Default: Conventional
-fsanitize-stats Enable sanitizer statistics gathering.
-fsanitize-system-ignorelist=<value>
Path to system ignorelist file for sanitizers
-fsanitize-thread-atomics
Enable atomic operations instrumentation in ThreadSanitizer (default)
-fsanitize-thread-func-entry-exit
Enable function entry/exit instrumentation in ThreadSanitizer (default)
-fsanitize-thread-memory-access
Enable memory access instrumentation in ThreadSanitizer (default)
-fsanitize-trap-loop Use infinite loops in trapping mode
-fsanitize-trap=<value> Enable trapping for specified sanitizers
-fsanitize-trap Enable trapping for all sanitizers
-fsanitize-type-outline-instrumentation
Always generate function calls for type sanitizer instrumentation
-fsanitize-undefined-ignore-overflow-pattern=<value>
Specify the overflow patterns to exclude from arithmetic sanitizer instrumentation
-fsanitize-undefined-strip-path-components=<number>
Strip (or keep only, if negative) a given number of path components when emitting check metadata.
-fsanitize=<check> Turn on runtime checks for various forms of undefined or suspicious behavior. See user manual for available checks
-fsave-optimization-record=<format>
Generate an optimization record file in a specific format
-fsave-optimization-record
Generate a YAML optimization record file
-fseh-exceptions Use SEH style exceptions
-fseparate-named-sections
Use separate unique sections for named sections (ELF Only)
-fshort-enums Allocate to an enum type only as many bytes as it needs for the declared range of possible values
-fshort-wchar Force wchar_t to be a short unsigned int
-fshow-overloads=<value>
Which overload candidates to show when overload resolution fails. Defaults to 'all'
-fshow-skipped-includes Show skipped includes in -H output.
-fsigned-char char is signed
-fsized-deallocation Enable C++14 sized global deallocation functions
-fsjlj-exceptions Use SjLj style exceptions
-fskip-odr-check-in-gmf Skip ODR checks for decls in the global module fragment.
-fslp-vectorize Enable the superword-level parallelism vectorization passes
-fspell-checking-limit=<value>
Set the maximum number of times to perform spell checking on unrecognized identifiers (0 = no limit)
-fsplit-dwarf-inlining Provide minimal debug info in the object/executable to facilitate online symbolication/stack traces in the absence of .dwo/.dwp files when using Split DWARF
-fsplit-lto-unit Enables splitting of the LTO unit
-fsplit-machine-functions
Enable late function splitting using profile information (x86 and aarch64 ELF)
-fsplit-stack Use segmented stack
-fstack-clash-protection
Enable stack clash protection
-fstack-protector-all Enable stack protectors for all functions
-fstack-protector-strong
Enable stack protectors for some functions vulnerable to stack smashing. Compared to -fstack-protector, this uses a stronger heuristic that includes functions containing arrays of any size (and any type), as well as any calls to alloca or the taking of an address from a local variable
-fstack-protector Enable stack protectors for some functions vulnerable to stack smashing. This uses a loose heuristic which considers functions vulnerable if they contain a char (or 8bit integer) array or constant sized calls to alloca , which are of greater size than ssp-buffer-size (default: 8 bytes). All variable sized calls to alloca are considered vulnerable. A function with a stack protector has a guard value added to the stack frame that is checked on function exit. The guard value must be positioned in the stack frame such that a buffer overflow from a vulnerable variable will overwrite the guard value before overwriting the function's return address. The reference stack guard value is stored in a global variable.
-fstack-size-section Emit section containing metadata on function stack sizes
-fstack-usage Emit .su file containing information on function stack sizes
-fstandalone-debug Emit full debug info for all types used by the program
-fstrict-aliasing Enable optimizations based on strict aliasing rules
-fstrict-bool Enable optimizations based on bool bit patterns never being anything other than 0 or 1
-fstrict-enums Enable optimizations based on the strict definition of an enum's value range
-fstrict-flex-arrays=<n>
Enable optimizations based on the strict definition of flexible arrays.
-fstrict-float-cast-overflow
Assume that overflowing float-to-int casts are undefined (default)
-fstrict-vtable-pointers
Enable optimizations based on the strict rules for overwriting polymorphic C++ objects
-fswift-async-fp=<option>
Control emission of Swift async extended frame info
-fswift-version-independent-apinotes
Enable version-independent external API notes support
-fsycl-device-image-split=<value>
Select the granularity at which SYCL device code is grouped into device images: kernel (one device image per kernel) | translation_unit (one device image per translation unit) | link_unit (one device image per linking unit). Default is 'translation_unit'.
-fsycl-device-image-split
Group SYCL device code into device images: one per 'translation_unit'.
-fsycl-device-only Compile SYCL code for device only
-fsycl-host-only Compile SYCL code for host only. Has no effect on non-SYCL compilations
-fsycl Enable SYCL C++ extensions
-fsyntax-only Run the preprocessor, parser and semantic analysis stages
-fsystem-module Build this module as a system module. Only used with -emit-module
-ftemplate-backtrace-limit=<value>
Set the maximum number of entries to print in a template instantiation backtrace (0 = no limit)
-ftemplate-depth=<value>
Set the maximum depth of recursive template instantiation
-ftemporal-profile Generate instrumented code to collect temporal information
-ftest-coverage Produce gcov notes files (*.gcno)
-fthin-link-bitcode=<value>
Write minimized bitcode to <file> for the ThinLTO thin link only
-fthinlto-distributor=<path>
Path to the ThinLTO distributor process. If specified, ThinLTO backend compilations will be distributed by LLD
-fthinlto-index=<value> Perform ThinLTO importing using provided function summary index
-ftime-report=<value> (For new pass manager) 'per-pass': one report for each pass; 'per-pass-run': one report for each pass invocation
-ftime-trace-granularity=<value>
Minimum time granularity (in microseconds) traced by time profiler
-ftime-trace-verbose<value>
Make time trace capture verbose event details (e.g. source filenames). This can increase the size of the output by 2-3 times
-ftime-trace=<value> Similar to -ftime-trace. Specify the JSON file or a directory which will contain the JSON file
-ftime-trace Turn on time profiler. Generates JSON file based on output filename.
-ftrap-function=<value> Issue call to specified function rather than a trap instruction
-ftrapv-handler=<function name>
Specify the function to be called on overflow
-ftrapv Trap on integer overflow
-ftrigraphs Process trigraph sequences
-ftrivial-auto-var-init-max-size=<value>
Stop initializing trivial automatic stack variables if var size exceeds the specified number of instances (in bytes)
-ftrivial-auto-var-init-stop-after=<value>
Stop initializing trivial automatic stack variables after the specified number of instances
-ftrivial-auto-var-init=<value>
Initialize trivial automatic stack variables. Defaults to 'uninitialized'
-funified-lto Use the unified LTO pipeline
-funique-basic-block-section-names
Use unique names for basic block sections (ELF Only)
-funique-internal-linkage-names
Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path
-funique-source-file-identifier=<value>
Specify the source file identifier for -funique-source-file-names; uses the source file path if not specified
-funique-source-file-names
Allow the compiler to assume that each translation unit has a unique source file identifier (see -funique-source-file-identifier) at link time
-funroll-loops Turn on loop unroller
-funsafe-math-optimizations
Allow unsafe floating-point math optimizations which may decrease precision
-fuse-cuid=<value> Method to generate ID's for compilation units for single source offloading languages CUDA and HIP: 'hash' (ID's generated by hashing file path and command line options) | 'random' (ID's generated as random numbers) | 'none' (disabled). Default is 'hash'. This option will be overridden by option '-cuid=[ID]' if it is specified.
-fuse-line-directives Use #line in preprocessed output
-fvalidate-ast-input-files-content
Compute and store the hash of input files used to build an AST. Files with mismatching mtime's are considered valid if both contents is identical
-fveclib=<value> Use the given vector functions library.
Note: -fveclib={ArmPL,SLEEF,libmvec} implies -fno-math-errno.
Note: -fveclib=libmvec on AArch64 requires GLIBC 2.40 or newer.
-fvectorize Enable the loop vectorization passes
-fverbose-asm Generate verbose assembly output
-fverify-intermediate-code
Enable verification of LLVM IR
-fvirtual-function-elimination
Enables dead virtual function elimination optimization. Requires -flto=full
-fvisibility-dllexport=<value>
The visibility for dllexport definitions. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility-externs-dllimport=<value>
The visibility for dllimport external declarations. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility-externs-nodllstorageclass=<value>
The visibility for external declarations without an explicit DLL storage class. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility-from-dllstorageclass
Override the visibility of globals based on their final DLL storage class.
-fvisibility-global-new-delete-hidden
Give global C++ operator new and delete declarations hidden visibility
-fvisibility-global-new-delete=<value>
The visibility for global C++ operator new and delete declarations. If 'source' is specified the visibility is not adjusted
-fvisibility-inlines-hidden-static-local-var
When -fvisibility-inlines-hidden is enabled, static variables in inline C++ member functions will also be given hidden visibility by default
-fvisibility-inlines-hidden
Give inline C++ member functions hidden visibility by default
-fvisibility-ms-compat Give global types 'default' visibility and global functions and variables 'hidden' visibility by default
-fvisibility-nodllstorageclass=<value>
The visibility for definitions without an explicit DLL storage class. If Keep is specified the visibility is not adjusted [-fvisibility-from-dllstorageclass]
-fvisibility=<value> Set the default symbol visibility for all global definitions
-fwasm-exceptions Use WebAssembly style exceptions
-fwhole-program-vtables Enables whole-program vtable optimization. Requires -flto
-fwin-cfg-mechanism=<value>
Sets the mechanism to use for Control Flow Guard on Windows
-fwinx64-eh-unwind=<value>
Set x64 Windows unwind info version
-fwinx64-eh-unwindv2=<value>
(Legacy) Generate unwind v2 (epilog) information for x64 Windows
-fwrapv-pointer Treat pointer overflow as two's complement
-fwrapv Treat signed integer overflow as two's complement
-fwritable-strings Store string literals as writable data
-fxl-pragma-pack Enable IBM XL #pragma pack handling
-fxray-always-emit-customevents
Always emit __xray_customevent(...) calls even if the containing function is not always instrumented
-fxray-always-emit-typedevents
Always emit __xray_typedevent(...) calls even if the containing function is not always instrumented
-fxray-always-instrument=<value>
DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute.
-fxray-attr-list=<value>
Filename defining the list of functions/types for imbuing XRay attributes.
-fxray-function-groups=<value>
Only instrument 1 of N groups
-fxray-ignore-loops Don't instrument functions with loops unless they also meet the minimum function size
-fxray-instruction-threshold=<value>
Sets the minimum function size to instrument with XRay
-fxray-instrumentation-bundle=<value>
Select which XRay instrumentation points to emit. Options: all, none, function-entry, function-exit, function, custom. Default is 'all'. 'function' includes both 'function-entry' and 'function-exit'.
-fxray-instrument Generate XRay instrumentation sleds on function entry and exit
-fxray-link-deps Link XRay runtime library when -fxray-instrument is specified (default)
-fxray-modes=<value> List of modes to link in by default into XRay instrumented binaries.
-fxray-never-instrument=<value>
DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute.
-fxray-selected-function-group=<value>
When using -fxray-function-groups, select which group of functions to instrument. Valid range is 0 to fxray-function-groups - 1
-fxray-shared Enable shared library instrumentation with XRay
-fzero-call-used-regs=<value>
Clear call-used registers upon function return (AArch64/RISC-V/x86 only)
-fzos-extensions Accept some non-standard constructs supported by the z/OS compiler
-fzvector Enable System z vector language extension
-F <value> Add directory to framework include search path
-gcall-site-info Enable call site debug info
--gcc-install-dir=<value>
Use GCC installation in the specified directory. The directory ends with path components like 'lib{,32,64}/gcc{,-cross}/$triple/$version'. Note: executables (e.g. ld) used by the compiler are not overridden by the selected GCC installation
--gcc-toolchain=<value> Specify a directory where Clang can find 'include' and 'lib{,32,64}/gcc{,-cross}/$triple/$version'. Clang will use the GCC installation with the largest version
--gcc-triple=<value> Search for the GCC installation with the specified triple.
-gcodeview-command-line Emit compiler path and command line into CodeView debug information
-gcodeview-ghash Emit type record hashes in a .debug$H section
-gcodeview Generate CodeView debug information
-gdwarf-2 Generate source-level debug information with DWARF version 2
-gdwarf-3 Generate source-level debug information with DWARF version 3
-gdwarf-4 Generate source-level debug information with DWARF version 4
-gdwarf-5 Generate source-level debug information with DWARF version 5
-gdwarf-6 Generate source-level debug information with DWARF version 6
-gdwarf32 Enables DWARF32 format for ELF binaries, if debug information emission is enabled.
-gdwarf64 Enables DWARF64 format for ELF binaries, if debug information emission is enabled.
-gdwarf Generate source-level debug information with the default DWARF version
-gembed-source Embed source text in DWARF debug sections
-gen-reproducer=<value> Emit reproducer on (option: off, crash (default), error, always)
-gkey-instructions Enable Key Instructions, which reduces the jumpiness of debug stepping in optimized C/C++ code in some debuggers. DWARF only.
-gline-directives-only Emit debug line info directives only
-gline-tables-only Emit debug line number tables only
-gmodules Generate debug info with external references to clang modules or precompiled headers
-gno-call-site-info Disable call site debug info
-gno-codeview-command-line
Don't emit compiler path and command line into CodeView debug information
-gno-embed-source Restore the default behavior of not embedding source text in DWARF debug sections
-gno-inline-line-tables Don't emit inline line tables.
--gpu-bundle-output Bundle output files of HIP device compilation
--gpu-instrument-lib=<value>
Instrument device library for HIP, which is a LLVM bitcode containing __cyg_profile_func_enter and __cyg_profile_func_exit
--gpu-max-threads-per-block=<value>
Default max threads per block for kernel launch bounds for HIP
-gpulibc Link the LLVM C Library for GPUs
-gsplit-dwarf=<value> Set DWARF fission mode
-gstrict-dwarf Restrict DWARF features to those defined in the specified version, avoiding features from later versions.
-gstructor-decl-linkage-names
Attach linkage names to C++ constructor/destructor declarations in DWARF.
-gz=<value> DWARF debug sections compression type
-G <size> Put objects of at most <size> bytes into small data section (MIPS / Hexagon)
-g Generate source-level debug information
--help-hidden Display help for hidden options
-help Display available options
--hip-device-lib=<value>
HIP device library
--hip-link Link clang-offload-bundler bundles for HIP
--hip-path=<value> HIP runtime installation path, used for finding HIP version and adding HIP include path.
--hip-version=<value> HIP version in the format of major.minor.patch
--hipspv-pass-plugin=<dsopath>
path to a pass plugin for HIP to SPIR-V passes.
--hipstdpar-interpose-alloc
Replace all memory allocation / deallocation calls with hipManagedMalloc / hipFree equivalents
--hipstdpar-path=<value>
HIP Standard Parallel Algorithm Acceleration library path, used for finding and implicitly including the library header
--hipstdpar-prim-path=<value>
rocPrim path, required by the HIP Standard Parallel Algorithm Acceleration library, used to implicitly include the rocPrim library
--hipstdpar-thrust-path=<value>
rocThrust path, required by the HIP Standard Parallel Algorithm Acceleration library, used to implicitly include the rocThrust library
--hipstdpar Enable HIP acceleration for standard parallel algorithms
-H Show header includes and nesting depth
-iapinotes-modules <directory>
Add directory to the API notes search path referenced by module name
-ibuiltininc Enable builtin #include directories even when -nostdinc is used before or after -ibuiltininc. Using -nobuiltininc after the option disables it
-idirafter <value> Add directory to AFTER include search path
-iframeworkwithsysroot <directory>
Add directory to SYSTEM framework search path, absolute paths are relative to -isysroot
-iframework <value> Add directory to SYSTEM framework search path
-ignore-pch Disable precompiled headers, overrides -emit-pch and -include-pch
-imacros <file> Include macros from file before parsing
-include-pch <file> Include precompiled header file
-include <file> Include file before parsing
-iprefix <dir> Set the -iwithprefix/-iwithprefixbefore prefix
-iquote <directory> Add directory to QUOTE include search path
-isysroot <dir> Set the system root directory (usually /)
-isystem-after <directory>
Add directory to end of the SYSTEM include search path
-isystem <directory> Add directory to SYSTEM include search path
-ivfsoverlay <value> Overlay the virtual filesystem described by file over the real file system
-iwithprefixbefore <dir>
Set directory to include search path with prefix
-iwithprefix <dir> Set directory to SYSTEM include search path with prefix
-iwithsysroot <directory>
Add directory to SYSTEM include search path, absolute paths are relative to -isysroot
-I <dir> Add directory to the end of the list of include search paths
--libclc-lib=<value> Namespec of libclc OpenCL bitcode library to link
--libomptarget-amdgcn-bc-path=<value>
Path to libomptarget-amdgcn bitcode library
--libomptarget-amdgpu-bc-path=<value>
Path to libomptarget-amdgcn bitcode library
--libomptarget-nvptx-bc-path=<value>
Path to libomptarget-nvptx bitcode library
--libomptarget-spirv-bc-path=<value>
Path to libomptarget-spirv bitcode library
-lifetime-safety-lifetimebound-macro=<macro>
Use the given macro name when suggesting lifetimebound attributes
-lifetime-safety-max-cfg-blocks=<value>
Skip LifetimeSafety analysis for functions with CFG block count exceeding this threshold. Specify 0 for no limit.
-L <dir> Add directory to library search path
-mabi=quadword-atomics Enable quadword atomics ABI on AIX (AIX PPC64 only). Uses lqarx/stqcx. instructions.
-mabicalls Enable SVR4-style position-independent code (Mips only)
-maix-shared-lib-tls-model-opt
For shared library loaded with the main program, change local-dynamic access(es) to initial-exec access(es) at the function level (AIX 64-bit only).
-maix-small-local-dynamic-tls
Produce a faster access sequence for local-dynamic TLS variables where the offset from the TLS base is encoded as an immediate operand (AIX 64-bit only). This access sequence is not used for variables larger than 32KB.
-maix-small-local-exec-tls
Produce a faster access sequence for local-exec TLS variables where the offset from the TLS base is encoded as an immediate operand (AIX 64-bit only). This access sequence is not used for variables larger than 32KB.
-maix-struct-return Return all structs in memory (PPC32 only)
-maix-use-ptrgl Use ._ptrgl routine for indirect calls (AIX only)
-malign-branch-boundary=<value>
Specify the boundary's size to align branches
-malign-branch=<value> Specify types of branches to align
-malign-double Align doubles to two words in structs (x86 only)
-maltivec Enable AltiVec vector initializer syntax
-mamdgpu-expand-waitcnt-profiling
Expand s_waitcnt instructions to help PC-sampling profilers identify memory stalls. Instead of a single waitcnt(target), emits waitcnt(N-1), waitcnt(N-2), ..., waitcnt(target). (AMDGPU only)
-mamdgpu-ieee Sets the IEEE bit in the expected default floating point mode register. Floating point opcodes that support exception flag gathering quiet and propagate signaling NaN inputs per IEEE 754-2008. This option changes the ABI. (AMDGPU only)
-mamdgpu-precise-memory-op
Enable precise memory mode (AMDGPU only)
-mannotate-tablejump Enable annotate table jump instruction to correlate it with the jump table.
-mapx-features=<value> Enable features of APX
-mapx-inline-asm-use-gpr32
Enable use of GPR32 in inline assembly for APX
-march=<value> For a list of available architectures for the target use '-mcpu=help'
-marm64x<value> Build as a hybrid ARM64X object/image
-mbackchain Link stack frames through backchain on System Z
-mbranch-protection=<value>
Enforce targets of indirect branches and function returns
-mbranches-within-32B-boundaries
Align selected branches (fused, jcc, jmp) within 32-byte boundary
-mcabac Enable CABAC instructions
-mcf-branch-label-scheme=<value>
Select label scheme for branch control-flow architecture protection
-mcmse Allow use of CMSE (Armv8-M Security Extensions)
-mcode-object-version=<value>
Specify code object ABI version. Defaults to 6. (AMDGPU only)
-mconstructor-aliases Enable emitting complete constructors and destructors as aliases when possible
-mcpu=<value> For a list of available CPUs for the target use '-mcpu=help'
-mcrbits Control the CR-bit tracking feature on PowerPC. ``-mcrbits`` (the enablement of CR-bit tracking support) is the default for POWER8 and above, as well as for all other CPUs when optimization is applied (-O2 and above).
-mcrc Allow use of CRC instructions (ARM/Mips only)
-mcumode Specify CU wavefront execution mode (AMDGPU only)
-mdaz-ftz Globally set the denormals-are-zero (DAZ) and flush-to-zero (FTZ) bits in the floating-point control register on program startup
-mdefault-visibility-export-mapping=<value>
Mapping between default visibility and export
-mdiv32 Use div.w[u] and mod.w[u] instructions with input not sign-extended.
-mdouble=<n Force double to be <n> bits
-MD Write a depfile containing user and system headers
-meabi <value> Set EABI type. Default depends on triple)
-membedded-data Place constants in the .rodata section instead of the .sdata section even if they meet the -G <size> threshold (MIPS)
-menable-experimental-extensions
Enable use of experimental RISC-V extensions.
-mexec-model=<value> Execution model (WebAssembly only)
-mexecute-only Disallow generation of data access to code sections (AArch64/ARM only)
-mexperimental-mtune-syntax
Enable experimental syntax for the '-mtune' flag (RISC-V only)
-mextern-sdata Assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
-mfentry Insert calls to fentry at function entry (x86/SystemZ only)
-mfix-cmse-cve-2021-35465
Work around VLLDM erratum CVE-2021-35465 (ARM only)
-mfix-cortex-a53-835769 Work around Cortex-A53 erratum 835769 (AArch64 only)
-mfix-cortex-a53-843419 Work around Cortex-A53 erratum 843419 (AArch64 only)
-mfix-cortex-a57-aes-1742098
Work around Cortex-A57 Erratum 1742098 (ARM only)
-mfix-cortex-a72-aes-1655431
Work around Cortex-A72 Erratum 1655431 (ARM only)
-mfix-gr712rc Enable workarounds for GR712RC errata
-mfix-r5900 Enable R5900 short loop erratum fix
-mfix-ut700 Enable workarounds for UT700 errata
-mfp32 Use 32-bit floating point registers (MIPS only)
-mfp64 Use 64-bit floating point registers (MIPS only)
-mframe-chain=<value> Select the frame chain model used to emit frame records (Arm only).
-mfrecipe Enable frecipe.{s/d} and frsqrte.{s/d}
-mfunction-return=<value>
Replace returns with jumps to ``__x86_return_thunk`` (x86 only, error otherwise)
-MF <file> Write depfile output from -MMD, -MD, -MM, or -M to <file>
-mgeneral-regs-only Generate code which only uses the general purpose registers (AArch64/x86 only)
-mglobal-merge Enable merging of globals
-mgpopt Use GP relative accesses for symbols known to be in a small data section (MIPS)
-mguard=<value> Enable or disable Control Flow Guard checks and guard tables emission
-MG Add missing headers to depfile
-mharden-sls=<value> Select straight-line speculation hardening scope (ARM/AArch64/X86 only). <arg> must be: all, none, retbr(ARM/AArch64), blr(ARM/AArch64), comdat(ARM/AArch64), nocomdat(ARM/AArch64), return(X86), indirect-jmp(X86)
-mhvx-ieee-fp Enable Hexagon HVX IEEE floating-point
-mhvx-length=<value> Set Hexagon Vector Length
-mhvx-qfloat=<value> Enable Hexagon HVX QFloat instructions with mode: strict-ieee, ieee, lossy, legacy (v79+)
-mhvx-qfloat Enable Hexagon HVX QFloat instructions
-mhvx=<value> Enable Hexagon Vector eXtensions
-mhvx Enable Hexagon Vector eXtensions
-miamcu Use Intel MCU ABI
-mignore-xcoff-visibility
Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file
-mimplicit-float Generate implicit floating point or vector instructions
-mincremental-linker-compatible
(integrated-as) Emit an object file which can be used with an incremental linker
-mindirect-branch-cs-prefix
Add cs prefix to call and jmp to indirect thunk
-mindirect-jump=<value> Change indirect jump instructions to inhibit speculation
-mios-version-min=<value>
Set iOS deployment target
-MJ <value> Write a compilation database entry per input
-mlam-bh Enable amswap[_db].{b/h} and amadd[_db].{b/h}
-mlamcas Enable amcas[_db].{b/h/w/d}
-mlasx Enable Loongson Advanced SIMD Extension (LASX).
-mld-seq-sa Do not generate same-address load-load barrier instructions (dbar 0x700)
-mlink-builtin-bitcode-postopt
Link builtin bitcodes after the optimization pipeline
-mllvm=<arg> Alias for -mllvm
-mllvm <value> Additional arguments to forward to LLVM's option processing
-mlocal-sdata Extend the -G behaviour to object local data (MIPS)
-mlong-calls Generate branches with extended addressability, usually via indirect jumps.
-mlong-double-128 Force long double to be 128 bits
-mlong-double-64 Force long double to be 64 bits
-mlong-double-80 Force long double to be 80 bits, padded to 128 bits for storage
-mlr-for-calls-only Do not allocate the LR register for general purpose usage, only for calls. (AArch64 only)
-mlsx Enable Loongson SIMD Extension (LSX).
-mlvi-cfi Enable only control-flow mitigations for Load Value Injection (LVI)
-mlvi-hardening Enable all mitigations for Load Value Injection (LVI)
-mmacos-version-min=<value>
Set macOS deployment target
-mmadd4 Enable the generation of 4-operand madd.s, madd.d and related instructions.
-mmark-bti-property Add .note.gnu.property with BTI to assembly files (AArch64 only)
-MMD Write a depfile containing user headers
-mmemops Enable generation of memop instructions
-mmlir <value> Additional arguments to forward to MLIR's option processing
-mms-bitfields Set the default structure layout to be compatible with the Microsoft compiler standard
-mmsa Enable MSA ASE (MIPS only)
-mmt Enable MT ASE (MIPS only)
-MM Like -MMD, but also implies -E and writes to stdout by default
-mno-abicalls Disable SVR4-style position-independent code (Mips only)
-mno-aix-use-ptrgl Emit indirect calls inline (AIX only) (default)
-mno-amdgpu-precise-memory-op
Disable precise memory mode (AMDGPU only)
-mno-annotate-tablejump Disable annotate table jump instruction to correlate it with the jump table.
-mno-apx-features=<value>
Disable features of APX
-mno-bti-at-return-twice
Do not add a BTI instruction after a setjmp or other return-twice construct (Arm/AArch64 only)
-mno-constructor-aliases
Disable emitting complete constructors and destructors as aliases when possible
-mno-crc Disallow use of CRC instructions (Mips only)
-mno-cumode Specify WGP wavefront execution mode (AMDGPU only)
-mno-daz-ftz Do not globally set the denormals-are-zero (DAZ) and flush-to-zero (FTZ) bits in the floating-point control register on program startup
-mno-div32 Do not use div.w[u] and mod.w[u] instructions with input not sign-extended.
-mno-embedded-data Do not place constants in the .rodata section instead of the .sdata if they meet the -G <size> threshold (MIPS)
-mno-execute-only Allow generation of data access to code sections (AArch64/ARM only)
-mno-experimental-mtune-syntax
Disable experimental syntax for the '-mtune' flag (RISC-V only)
-mno-extern-sdata Do not assume that externally defined data is in the small data if it meets the -G <size> threshold (MIPS)
-mno-fix-cmse-cve-2021-35465
Don't work around VLLDM erratum CVE-2021-35465 (ARM only)
-mno-fix-cortex-a53-835769
Don't work around Cortex-A53 erratum 835769 (AArch64 only)
-mno-fix-cortex-a53-843419
Don't work around Cortex-A53 erratum 843419 (AArch64 only)
-mno-fix-cortex-a57-aes-1742098
Don't work around Cortex-A57 Erratum 1742098 (ARM only)
-mno-fix-cortex-a72-aes-1655431
Don't work around Cortex-A72 Erratum 1655431 (ARM only)
-mno-fix-r5900 Disable R5900 short loop erratum fix
-mno-fmv Disable function multiversioning
-mno-frecipe Disable frecipe.{s/d} and frsqrte.{s/d}
-mno-gather Disable generation of gather instructions in auto-vectorization(x86 only)
-mno-global-merge Disable merging of globals
-mno-gpopt Do not use GP relative accesses for symbols known to be in a small data section (MIPS)
-mno-hvx-ieee-fp Disable Hexagon HVX IEEE floating-point
-mno-hvx-qfloat Disable Hexagon HVX QFloat instructions
-mno-hvx Disable Hexagon Vector eXtensions
-mno-implicit-float Don't generate implicit floating point or vector instructions
-mno-incremental-linker-compatible
(integrated-as) Emit an object file which cannot be used with an incremental linker
-mno-lam-bh Disable amswap[_db].{b/h} and amadd[_db].{b/h}
-mno-lamcas Disable amcas[_db].{b/h/w/d}
-mno-lasx Disable Loongson Advanced SIMD Extension (LASX).
-mno-ld-seq-sa Generate same-address load-load barrier instructions (dbar 0x700)
-mno-local-sdata Do not extend the -G behaviour to object local data (MIPS)
-mno-long-calls Restore the default behaviour of not generating long calls
-mno-lsx Disable Loongson SIMD Extension (LSX).
-mno-lvi-cfi Disable control-flow mitigations for Load Value Injection (LVI)
-mno-lvi-hardening Disable mitigations for Load Value Injection (LVI)
-mno-madd4 Disable the generation of 4-operand madd.s, madd.d and related instructions.
-mno-memops Disable generation of memop instructions
-mno-movt Disallow use of movt/movw pairs (ARM only)
-mno-ms-bitfields Do not set the default structure layout to be compatible with the Microsoft compiler standard
-mno-msa Disable MSA ASE (MIPS only)
-mno-mt Disable MT ASE (MIPS only)
-mno-neg-immediates Disallow converting instructions with negative immediates to their negation or inversion.
-mno-nvj Disable generation of new-value jumps
-mno-nvs Disable generation of new-value stores
-mno-outline-atomics Don't generate local calls to out-of-line atomic operations
-mno-outline Disable function outlining (AArch64,Arm,RISC-V,X86 only)
-mno-packets Disable generation of instruction packets
-mno-pic-data-is-text-relative
Don't assume data segments are relative to text segment
-mno-regnames Use only register numbers when writing assembly output
-mno-relax Disable linker relaxation
-mno-restrict-it Allow generation of complex IT blocks.
-mno-save-restore Disable using library calls for save and restore
-mno-scalar-strict-align
Allow scalar memory accesses to be unaligned (RISC-V only)
-mno-scatter Disable generation of scatter instructions in auto-vectorization(x86 only)
-mno-scq Disable sc.q instruction.
-mno-seses Disable speculative execution side effect suppression (SESES)
-mno-sramecc Disable SRAMECC (AMDGPU only)
-mno-stack-arg-probe Disable stack probes which are enabled by default
-mno-strict-align Allow memory accesses to be unaligned (AArch64/LoongArch/RISC-V only)
-mno-tgsplit Disable threadgroup split execution mode (AMDGPU only)
-mno-tls-direct-seg-refs
Disable direct TLS access through segment registers
-mno-tocdata=<value> Specifies a list of variables to be exempt from the TOC data transformation.
-mno-tocdata This is the default. TOC data transformation is not applied to any variables. Only variables specified explicitly in -mtocdata= will have the TOC data transformation.
-mno-unaligned-access Force all memory accesses to be aligned (AArch32/MIPSr6 only)
-mno-unaligned-symbols Expect external char-aligned symbols to be without ABI alignment (SystemZ only)
-mno-v8plus Disable V8+ mode
-mno-vector-strict-align
Allow vector memory accesses to be unaligned (RISC-V only)
-mno-wavefrontsize64 Specify wavefront size 32 mode (AMDGPU only)
-mno-xnack Disable XNACK (AMDGPU only)
-mno-zos-ppa1-name Do not emit the function name in PPA1 on z/OS
-mnocrc Disallow use of CRC instructions (ARM only)
-mnop-mcount Generate mcount/__fentry__ calls as nops. To activate they need to be patched in.
-mnvj Enable generation of new-value jumps
-mnvs Enable generation of new-value stores
-module-dependency-dir <value>
Directory to dump module dependencies to
-module-file-info Provide information about a particular module file
-momit-leaf-frame-pointer
Omit frame pointer setup for leaf functions
-moutline-atomics Generate local calls to out-of-line atomic operations
-moutline Enable function outlining (AArch64,Arm,RISC-V,X86 only)
-mpacked-stack Use packed stack layout (SystemZ only).
-mpackets Enable generation of instruction packets
-mpad-max-prefix-size=<value>
Specify maximum number of prefixes to use for padding
-mpic-data-is-text-relative
Assume data segments are relative to text segment
-mprefer-vector-width=<value>
Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.
-mprintf-kind=<value> Specify the printf lowering scheme (AMDGPU only), allowed values are "hostcall"(printing happens during kernel execution, this scheme relies on hostcalls which require system to support pcie atomics) and "buffered"(printing happens after all kernel threads exit, this uses a printf buffer and does not rely on pcie atomic support)
-MP Create phony target for each dependency (other than main file)
-mqdsp6-compat Enable hexagon-qdsp6 backward compatibility
-MQ <value> Specify name of main file output to quote in depfile
-mrecip=<value> Control use of approximate reciprocal and reciprocal square root instructions followed by <n> iterations of Newton-Raphson refinement. <value> = ( ['!'] ['vec-'] ('rcp'|'sqrt') [('h'|'s'|'d')] [':'<n>] ) | 'all' | 'default' | 'none'
-mrecip Equivalent to '-mrecip=all'
-mrecord-mcount Generate a __mcount_loc section entry for each __fentry__ call.
-mregnames Use full register names when writing assembly output
-mrelax-all (integrated-as) Relax all machine instructions
-mrelax Enable linker relaxation
-mreserve-frame-pointer-reg
Reserve the frame pointer register even if the function doesn't have a frame
-mrestrict-it Disallow generation of complex IT blocks. It is off by default.
-mrtd Make StdCall calling convention the default
-mrvv-vector-bits=<value>
Specify the size in bits of an RVV vector register
-msave-reg-params Save arguments passed by registers to ABI-defined stack positions
-msave-restore Enable using library calls for save and restore
-mscalar-strict-align Force all scalar memory accesses to be aligned (RISC-V only)
-mscq Enable sc.q instruction.
-mscs-reg=<value> Register holding the shadow call stack pointer: one of the callee-saved registers r16-r27, default r18 (Hexagon only). The chosen register must also be reserved with -ffixed-<reg>.
-mseses Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations
-msign-return-address=<value>
Select return address signing scope
-msimd=<value> Select the SIMD extension(s) to be enabled in LoongArch either 'none', 'lsx', 'lasx'.
-mskip-rax-setup Skip setting up RAX register when passing variable arguments (x86 only)
-msmall-data-limit=<value>
Put global and static data smaller than the limit into a special section
-msoft-float Use software floating point
-msramecc Enable SRAMECC (AMDGPU only)
-msse2avx Specify that the assembler should encode SSE instructions with VEX prefix
-mstack-alignment=<value>
Set the stack alignment
-mstack-arg-probe Enable stack probes
-mstack-probe-size=<value>
Set the stack probe size
-mstack-protector-guard-offset=<value>
Use the given offset for addressing the stack-protector guard
-mstack-protector-guard-record
Generate a __stack_protector_loc section entry for each load of the stack-protector guard address.
-mstack-protector-guard-reg=<value>
Use the given reg for addressing the stack-protector guard
-mstack-protector-guard-symbol=<value>
Use the given symbol for addressing the stack-protector guard
-mstack-protector-guard-value-width=<value>
Use the given width for the value of the the stack-protector guard (AArch64-only)
-mstack-protector-guard=<value>
Use the given guard (global, tls) for addressing the stack-protector guard
-mstackrealign Force realign the stack at entry to every function
-mstrict-align Force all memory accesses to be aligned (AArch64/LoongArch/RISC-V only)
-msve-streaming-vector-bits=<value>
Specify the size in bits of an SVE vector register in streaming mode. Defaults to the vector length agnostic value of "scalable". (AArch64 only)
-msve-vector-bits=<value>
Specify the size in bits of an SVE vector register. Defaults to the vector length agnostic value of "scalable". (AArch64 only)
-msvr4-struct-return Return small structs in registers (PPC32 only)
-mtargetos=<value> Set the deployment target to be the specified OS and OS version
-mtgsplit Enable threadgroup split execution mode (AMDGPU only)
-mthread-model <value> The thread model to use. Defaults to 'posix')
-mtls-dialect=<value> Which thread-local storage dialect to use for dynamic accesses of TLS variables
-mtls-direct-seg-refs Enable direct TLS access through segment registers (default)
-mtls-size=<value> Specify bit size of immediate TLS offsets (AArch64 ELF only): 12 (for 4KB) | 24 (for 16MB, default) | 32 (for 4GB) | 48 (for 256TB, needs -mcmodel=large)
-mtocdata=<value> Specifies a list of variables to which the TOC data transformation will be applied.
-mtocdata All suitable variables will have the TOC data transformation applied
-mtp=<value> Thread pointer access method. For AArch32: 'soft' uses a function call, or 'tpidrurw', 'tpidruro' or 'tpidrprw' use the three CP15 registers. 'cp15' is an alias for 'tpidruro'. For AArch64: 'tpidr_el0', 'tpidr_el1', 'tpidr_el2', 'tpidr_el3' or 'tpidrro_el0' use the five system registers. 'elN' is an alias for 'tpidr_elN'.
-mtune=<value> Only supported on AArch64, PowerPC, RISC-V, SPARC, SystemZ, and X86
-MT <value> Specify name of main file output in depfile
-multi-lib-config=<file>
Path to the YAML configuration file to be used for multilib selection
-munaligned-access Allow memory accesses to be unaligned (AArch32/MIPSr6 only)
-munaligned-symbols Expect external char-aligned symbols to be without ABI alignment (SystemZ only)
-mv8plus Enable V8+ mode, allowing use of 64-bit V9 instructions in 32-bit code
-mvector-strict-align Force all vector memory accesses to be aligned (RISC-V only)
-mvevpu Emit VPU instructions for VE
-MV Use NMake/Jom format for the depfile
-mwavefrontsize64 Specify wavefront size 64 mode (AMDGPU only)
-mxcoff-build-id=<0xHEXSTRING>
On AIX, request creation of a build-id string, "0xHEXSTRING", in the string table of the loader section inside the linked binary
-mxcoff-roptr Place constant objects with relocatable address values in the RO data section and add -bforceimprw to the linker flags (AIX only)
-mxnack Enable XNACK (AMDGPU only)
-mzilsd-strict-align Force all Zilsd/Zclsd memory accesses to be 8-byte aligned (RISC-V only)
-mzilsd-word-align Allow Zilsd/Zclsd memory accesses to be 4-byte aligned (RISC-V only)
-mzos-hlq-clang=<ClangHLQ>
High level qualifier for z/OS C++RT side deck datasets
-mzos-hlq-csslib=<CsslibHLQ>
High level qualifier for z/OS CSSLIB dataset
-mzos-hlq-le=<LeHLQ> High level qualifier for z/OS Language Environment datasets
-mzos-ppa1-name Emit the function name in PPA1 on z/OS
-mzos-sys-include=<SysInclude>
Path to system headers on z/OS
-mzos-target=<value> Set the z/OS release of the runtime environment
-M Like -MD, but also implies -E and writes to stdout by default
--no-cuda-include-ptx=<value>
Do not include PTX for the following GPU architecture (e.g. sm_35) or 'all'. May be specified more than once.
--no-cuda-version-check Don't error out if the detected version of the CUDA install is too low for the requested CUDA gpu architecture.
--no-default-config Disable loading default configuration files
--no-gpu-bundle-output Do not bundle output files of HIP device compilation
-no-hip-rt Do not link against HIP runtime libraries
--no-offload-arch=<value>
Remove CUDA/HIP offloading device architecture (e.g. sm_35, gfx906) from the list of devices to compile for. 'all' resets the list to its default value.
--no-offload-inc Do not add include paths for CUDA/HIP and include the default CUDA/HIP wrapper headers
--no-offload-new-driver Don't Use the new driver for offloading compilation.
--no-offloadlib Do not link device library for CUDA/HIP/SYCL device compilation
--no-system-header-prefix=<prefix>
Treat all #include paths starting with <prefix> as not including a system header.
--no-wasm-opt Disable the wasm-opt optimizer
--no-xcselect Disable xcselect SDK injection on macOS
-nobuiltininc Disable builtin #include directories only
-nohipwrapperinc Do not include the default HIP wrapper headers and include paths
-nolibsycl Do not link the SYCL runtime library
-nostdinc++ Disable standard #include directories for the C++ standard library
-nostdinc Disable both standard system #include directories and builtin #include directories
-nostdlibinc Disable standard system #include directories only
-ObjC++ Treat source input files as Objective-C++ inputs
-ObjC Treat source input files as Objective-C inputs
-object-file-name=<file>
Set the output <file> for debug infos
-Ofast<value> Deprecated; use '-O3 -ffast-math' for the same behavior, or '-O3' to enable only conforming optimizations
--offload-arch-tool=<value>
Tool used for detecting offloading architectures in the system.
--offload-arch=<value> Specify an offloading device architecture for CUDA, HIP, or OpenMP. (e.g. sm_35). If 'native' is used the compiler will detect locally installed architectures. For HIP offloading, the device architecture can be followed by target ID features delimited by a colon (e.g. gfx908:xnack+:sramecc-). May be specified more than once.
--offload-compress Compress offload device binaries (HIP only)
--offload-device-only Only compile for the offloading device.
--offload-host-device Compile for both the offloading host and device (default).
--offload-host-only Only compile for the offloading host.
--offload-inc Add include paths for CUDA/HIP and include the default CUDA/HIP wrapper headers (default)
--offload-jobs=<value> Specify the number of threads to use for device offloading tasks during compilation. Can be a positive integer or the string 'jobserver' to use the make-style jobserver from the environment.
--offload-link Use the new offloading linker to perform the link job.
--offload-new-driver Use the new driver for offloading compilation.
--offload-targets=<value>
[truncated]
Options (600)
| Option | Description | Source |
|---|---|---|
-### | Print (but do not run) the commands to run for this compilation | help |
--analyzer-output value | Static analyzer report output format (html|plist|plist-multi-file|plist-html|sarif|sarif-html|text). | help |
--analyze | Run the static analyzer | help |
-B prefix | Search $prefix$file for executables, libraries, and data files. | help |
-b arg | Pass -b <arg> to the linker on AIX | help |
-CC | Include comments from within macros in preprocessed output | help |
-cl-denorms-are-zero | OpenCL only. | help |
-cl-ext value | OpenCL only. | help |
-cl-fast-relaxed-math | OpenCL only. | help |
-cl-finite-math-only | OpenCL only. | help |
-cl-fp32-correctly-rounded-divide-sqrt | OpenCL only. | help |
-cl-kernel-arg-info | OpenCL only. | help |
-cl-mad-enable | OpenCL only. | help |
-cl-no-signed-zeros | OpenCL only. | help |
-cl-no-stdinc | OpenCL only. | help |
-cl-opt-disable | OpenCL only. | help |
-cl-single-precision-constant | OpenCL only. | help |
-cl-std value | OpenCL language standard to compile for. | help |
-cl-strict-aliasing | OpenCL only. | help |
-cl-uniform-work-group-size | OpenCL only. | help |
-cl-unsafe-math-optimizations | OpenCL only. | help |
-clangir-disable-verifier | ClangIR: Disable MLIR module verifier | help |
-clangir-enable-idiom-recognizer | ClangIR: Enable Idiom Recognizer pass | help |
-clangir-lib-opt value | Enable C/C++ library based optimizations (with options) | help |
--config file | Specify configuration file | help |
--cstdlib value | C standard library to use | help |
--cuda-compile-host-device | Compile CUDA code for both host and device (default). | help |
--cuda-device-only | Compile CUDA code for device only | help |
--cuda-feature value | Manually specify the CUDA feature to use | help |
--cuda-host-only | Compile CUDA code for host only. | help |
--cuda-include-ptx value | Include PTX for the following GPU architecture (e.g. sm_35) or 'all'. | help |
--cuda-noopt-device-debug | Enable device-side debug info generation. | help |
--cuda-path-ignore-env | Ignore environment variables to detect CUDA installation | help |
--cuda-path value | CUDA installation path | help |
-cuid value | An ID for compilation unit, which should be the same for the same compilation unit but different for different compilation units. | help |
-cxx-isystem directory | Add directory to the C++ SYSTEM include search path | help |
-C | Include comments in preprocessed output | help |
-c | Only run preprocess, compile, and assemble steps | help |
-darwin-target-variant-triple value | Specify the darwin target variant triple | help |
-darwin-target-variant value | Generate code for an additional runtime variant of the deployment target | help |
-dD | Print macro definitions in -E mode in addition to normal output | help |
-dependency-file value | Filename (or -) to write dependency output to | help |
-dI | Print include directives in -E mode in addition to normal output | help |
-dM | Print macro definitions in -E mode instead of normal output | help |
-dsym-dir dir | Directory to output dSYM's (if any) to | help |
-dumpdir dumppfx | Use <dumpfpx> as a prefix to form auxiliary and dump file names | help |
-dumpmachine | Display the compiler's target processor | help |
-dumpversion | Display the version of the compiler | help |
-D macro>=<value | Define <macro> to <value> (or 1 if <value> omitted) | help |
--embed-dir dir | Add directory to embed search path | help |
-emit-ast | Emit Clang AST files for source inputs | help |
-emit-cir | Build ASTs and then lower to ClangIR | help |
--emit-extension-symbol-graphs | Generate additional symbol graphs for extended modules. | help |
-emit-interface-stubs | Generate Interface Stub Files. | help |
-emit-llvm | Use the LLVM representation for assembler and object files | help |
-emit-merged-ifs | Generate Interface Stub Files, emit merged text not binary. | help |
--emit-static-lib | Enable linker job to emit a static library. | help |
-emit-symbol-graph | Generate Extract API information as a side effect of compilation. | help |
--end-no-unused-arguments | Start emitting warnings for unused driver arguments | help |
--extract-api-ignores value | Comma separated list of files containing a new line separated list of API symbols to ignore when extracting API information. | help |
-extract-api | Extract API information | help |
-E | Only run the preprocessor | help |
-faapcs-bitfield-load | Follows the AAPCS standard that all volatile bit-field write generates at least one load. | help |
-faapcs-bitfield-width | Follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. | help |
-faarch64-jump-table-hardening | Use hardened lowering for jump-table dispatch | help |
-faddrsig | Emit an address-significance table | help |
-falign-loops N | N must be a power of two. | help |
-faligned-allocation | Enable C++17 aligned allocation functions | help |
-falloc-token-max N | Limit to maximum N allocation tokens (0 = target SIZE_MAX) | help |
-fallow-editor-placeholders | Treat editor placeholders as valid source code | help |
-fallow-runtime-check-skip-hot-cutoff value | Exclude __builtin_allow_runtime_check for the top hottest code responsible for the given fraction of PGO counters (0.0 [default] = skip none; | help |
-faltivec-src-compat value | Source-level compatibility for Altivec vectors (for PowerPC targets). | help |
-fansi-escape-codes | Use ANSI escape codes for diagnostics | help |
-fapinotes-modules | Enable module-based external API notes support | help |
-fapinotes-swift-version version | Specify the Swift version to use when filtering API notes | help |
-fapinotes | Enable external API notes support | help |
-fapple-kext | Use Apple's kernel extensions ABI | help |
-fapple-link-rtlib | Force linking the clang builtins runtime library | help |
-fapple-pragma-pack | Enable Apple gcc-compatible #pragma pack handling | help |
-fapprox-func | Allow certain math function calls to be replaced with an approximately equivalent calculation | help |
-fassume-nothrow-exception-dtor | Assume that exception objects' destructors are non-throwing | help |
-fasync-exceptions | Enable EH Asynchronous exceptions | help |
-fatomic-fine-grained-memory | May have atomic operations on fine-grained memory | help |
-fatomic-ignore-denormal-mode | Allow atomic operations to ignore denormal mode | help |
-fatomic-remote-memory | May have atomic operations on remote memory | help |
-fauto-import | MinGW specific. | help |
-fbasic-block-address-map | Emit the basic block address map section. | help |
-fbasic-block-sections value | Place each function's basic blocks in unique sections (ELF Only) | help |
-fbinutils-version major.minor | Produced object files can use all ELF features supported by this binutils version and newer. | help |
-fblocks | Enable the 'blocks' language feature | help |
-fborland-extensions | Accept non-standard constructs supported by the Borland compiler | help |
-fbuild-session-file file | Use the last modification time of <file> as the build session timestamp | help |
-fbuiltin-module-map | Load the clang builtins module map file. | help |
-fc++-abi value | C++ ABI to use. | help |
-fc++-static-destructors value | Controls which variables C++ static destructors are registered for | help |
-fcall-saved-x10 | Make the x10 register call-saved (AArch64 only) | help |
-fcall-saved-x11 | Make the x11 register call-saved (AArch64 only) | help |
-fcall-saved-x12 | Make the x12 register call-saved (AArch64 only) | help |
-fcall-saved-x13 | Make the x13 register call-saved (AArch64 only) | help |
-fcall-saved-x14 | Make the x14 register call-saved (AArch64 only) | help |
-fcall-saved-x15 | Make the x15 register call-saved (AArch64 only) | help |
-fcall-saved-x18 | Make the x18 register call-saved (AArch64 only) | help |
-fcall-saved-x8 | Make the x8 register call-saved (AArch64 only) | help |
-fcall-saved-x9 | Make the x9 register call-saved (AArch64 only) | help |
-fcaret-diagnostics-max-lines value | Set the maximum number of source lines to show in a caret diagnostic (0 = no limit). | help |
-fcf-protection | Enable cf-protection in 'full' mode | help |
-fchar8_t | Enable C++ builtin type char8_t | help |
-fcheck-new | Do not assume C++ operator new may not return NULL | help |
-fclang-abi-compat version | Attempt to match the ABI of Clang <version> | help |
-fclangir | Use the ClangIR pipeline to compile | help |
-fcodegen-data-generate path | Emit codegen data into the object file. | help |
-fcodegen-data-use path | Use codegen data read from the specified <path>. | help |
-fcolor-diagnostics | Enable colors in diagnostics | help |
-fcomment-block-commands arg | Treat each comma separated argument in <arg> as a documentation comment block command | help |
-fcommon | Place uninitialized global variables in a common block | help |
-fcomplete-member-pointers | Require member pointer base types to be complete if they would be significant under the Microsoft ABI | help |
-fcomplex-arithmetic value | Controls the calculation methods of complex number multiplication and division. | help |
-fconstant-nsarray-literals | Enable compile-time constant NSArray literals | help |
-fconstant-nsdictionary-literals | Enable compile-time constant NSDictionary literals | help |
-fconstant-nsnumber-literals | Enable compile-time constant NSNumber literals | help |
-fconstexpr-backtrace-limit value | Set the maximum number of entries to print in a constexpr evaluation backtrace (0 = no limit) | help |
-fconstexpr-depth value | Set the maximum depth of recursive constexpr function calls | help |
-fconstexpr-steps value | Set the maximum number of steps in constexpr function evaluation (0 = no limit) | help |
-fconvergent-functions | Assume all functions may be convergent. | help |
-fcoro-aligned-allocation | Prefer aligned allocation for C++ Coroutines | help |
-fcoroutines | Enable support for the C++ Coroutines | help |
-fcoverage-compilation-dir value | The compilation directory to embed in the coverage mapping. | help |
-fcoverage-mapping | Generate coverage mapping to enable code coverage analysis | help |
-fcoverage-mcdc | Enable MC/DC criteria when generating code coverage | help |
-fcoverage-prefix-map old>=<new | remap file source paths <old> to <new> in coverage mapping. | help |
-fcrash-diagnostics-dir dir | Put crash-report files in <dir> | help |
-fcrash-diagnostics-tar path | Put crash-report tarball at <path> | help |
-fcrash-diagnostics value | Set level of crash diagnostic reporting, (option: off, compiler, all) | help |
-fcs-profile-generate directory | Generate instrumented code to collect context sensitive execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var) | help |
-fcuda-short-ptr | Use 32-bit pointers for accessing const/local/shared address spaces | help |
-fcx-fortran-rules | Range reduction is enabled for complex arithmetic operations. | help |
-fcx-limited-range | Basic algebraic expansions of complex arithmetic operations involving are enabled. | help |
-fcxx-exceptions | Enable C++ exceptions | help |
-fcxx-modules | Enable modules for C++ | help |
-fdata-sections | Place each data in its own section | help |
-fdebug-compilation-dir value | The compilation directory to embed in the debug info | help |
-fdebug-default-version value | Default DWARF version to use, if a -g option caused DWARF debug info to be produced | help |
-fdebug-info-for-profiling | Emit extra debug info to make sample profile more accurate | help |
-fdebug-macro | Emit macro debug information | help |
-fdebug-prefix-map old>=<new | For paths in debug info, remap directory <old> to <new>. | help |
-fdebug-ranges-base-address | Use DWARF base address selection entries in .debug_ranges | help |
-fdebug-record-sysroot | Record the sysroot path in debug info as DW_AT_LLVM_sysroot and in DW_AT_LLVM_include_path (used by LLDB to locate the SDK for Clang module imports). | help |
-fdebug-types-section | Place debug types in their own section (ELF Only) | help |
-fdeclspec | Allow __declspec as a keyword | help |
-fdefer-ts | Enable support for the C '_Defer' Technical Specification | help |
-fdefine-target-os-macros | Enable predefined target OS macros | help |
-fdelayed-template-parsing | Parse templated function definitions at the end of the translation unit | help |
-fdelete-null-pointer-checks | Treat usage of null pointers as undefined behavior (default) | help |
-fdevirtualize-speculatively | Enables speculative devirtualization optimization. | help |
-fdiagnostics-absolute-paths | Print absolute paths in diagnostics | help |
-fdiagnostics-color value | When to use colors in diagnostics | help |
-fdiagnostics-hotness-threshold value | Prevent optimization remarks from being output if they do not have at least this profile count. | help |
-fdiagnostics-misexpect-tolerance value | Prevent misexpect diagnostics from being output if the profile counts are within N% of the expected. | help |
-fdiagnostics-parseable-fixits | Print fix-its in machine parseable form | help |
-fdiagnostics-print-source-range-info | Print source range spans in numeric form | help |
-fdiagnostics-show-hotness | Enable profile hotness information in diagnostic line | help |
-fdiagnostics-show-inlining-chain | Show inlining chain notes for [[gnu::warning/error]] diagnostics | help |
-fdiagnostics-show-note-include-stack | Display include stacks for diagnostic notes | help |
-fdiagnostics-show-option | Print option name with mappable diagnostics | help |
-fdiagnostics-show-template-tree | Print a template comparison tree for differing templates | help |
-fdigraphs | Enable alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' (default) | help |
-fdirect-access-external-data | Don't use GOT indirection to reference external data symbols | help |
-fdisable-block-signature-string | Disable block signature string) | help |
-fdiscard-value-names | Discard value names in LLVM IR | help |
-fdollars-in-identifiers | Allow '$' in identifiers | help |
-fdriver-only | Only run the driver. | help |
-fdwarf-exceptions | Use DWARF style exceptions | help |
-feliminate-unused-debug-types | Do not emit debug info for defined but unused types | help |
-fembed-bitcode-marker | Embed placeholder LLVM IR data as a marker | help |
-fembed-bitcode option | Embed LLVM bitcode | help |
-fembed-offload-object value | Embed Offloading device-side binary into host object file as a section. | help |
-femit-all-decls | Emit all declarations, even if unused | help |
-femit-compact-unwind-non-canonical | Try emitting Compact-Unwind for non-canonical entries. | help |
-femit-dwarf-unwind value | When to emit DWARF unwind (EH frame) info | help |
-femulated-tls | Use emutls functions to access thread_local variables | help |
-fenable-matrix | Enable matrix data type and related builtin functions | help |
-fexceptions | Enable support for exception handling | help |
-fexcess-precision value | Allows control over excess precision on targets where native support for the precision types is not available. | help |
-fexperimental-allow-pointer-field-protection-attr | Allow the use of the [[clang::pointer_field_protection]] attribute | help |
-fexperimental-call-graph-section | Emit a call graph section | help |
-fexperimental-late-parse-attributes | Enable experimental late parsing of attributes | help |
-fexperimental-library | Control whether unstable and experimental library features are enabled. | help |
-fexperimental-loop-fusion | EnableEnable the loop fusion pass | help |
-fexperimental-openacc-macro-override value | Overrides the _OPENACC macro value for experimental testing during OpenACC support development | help |
-fexperimental-pointer-field-protection-abi | Enable pointer field protection on all non-standard layout struct types | help |
-fexperimental-pointer-field-protection-tagged | Use pointer identity (tag) to discriminate pointers of non-trivially-copyable types | help |
-fexperimental-relative-c++-abi-vtables | Use the experimental C++ class ABI for classes with virtual tables | help |
-fexperimental-sanitize-metadata-ignorelist value | Disable sanitizer metadata for modules and functions that match the provided special case list | help |
-fexperimental-sanitize-metadata value | Specify the type of metadata to emit for binary analysis sanitizers | help |
-fexperimental-strict-floating-point | Enables the use of non-default rounding modes and non-default exception handling on targets that are not currently ready. | help |
-fextend-arguments value | Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions | help |
-fextend-variable-liveness value | Extend the liveness of user variables through optimizations to prevent stale or optimized-out variable values when debugging. | help |
-ffast-math | Allow aggressive, lossy floating-point optimizations | help |
-ffat-lto-objects | Enable fat LTO object support | help |
-ffile-compilation-dir value | The compilation directory to embed in the debug info and coverage mapping. | help |
-ffile-prefix-map value | remap file source paths in debug info, coverage mapping, predefined preprocessor macros and __builtin_FILE(). | help |
-ffile-reproducible | Use the target's platform-specific path separator character when expanding the __FILE__ macro | help |
-ffine-grained-bitfield-accesses | Use separate accesses for consecutive bitfield runs with legal widths and alignments. | help |
-ffinite-loops | Assume all non-trivial loops are finite. | help |
-ffinite-math-only | Allow floating-point optimizations that assume arguments and results are not NaNs or +-inf. | help |
-ffixed-a0 | Reserve the a0 register (M68k only) | help |
-ffixed-a1 | Reserve the a1 register (M68k only) | help |
-ffixed-a2 | Reserve the a2 register (M68k only) | help |
-ffixed-a3 | Reserve the a3 register (M68k only) | help |
-ffixed-a4 | Reserve the a4 register (M68k only) | help |
-ffixed-a5 | Reserve the a5 register (M68k only) | help |
-ffixed-a6 | Reserve the a6 register (M68k only) | help |
-ffixed-d0 | Reserve the d0 register (M68k only) | help |
-ffixed-d1 | Reserve the d1 register (M68k only) | help |
-ffixed-d2 | Reserve the d2 register (M68k only) | help |
-ffixed-d3 | Reserve the d3 register (M68k only) | help |
-ffixed-d4 | Reserve the d4 register (M68k only) | help |
-ffixed-d5 | Reserve the d5 register (M68k only) | help |
-ffixed-d6 | Reserve the d6 register (M68k only) | help |
-ffixed-d7 | Reserve the d7 register (M68k only) | help |
-ffixed-edi | Reserve the edi register (x86 only) | help |
-ffixed-g1 | Reserve the G1 register (SPARC only) | help |
-ffixed-g2 | Reserve the G2 register (SPARC only) | help |
-ffixed-g3 | Reserve the G3 register (SPARC only) | help |
-ffixed-g4 | Reserve the G4 register (SPARC only) | help |
-ffixed-g5 | Reserve the G5 register (SPARC only) | help |
-ffixed-g6 | Reserve the G6 register (SPARC only) | help |
-ffixed-g7 | Reserve the G7 register (SPARC only) | help |
-ffixed-i0 | Reserve the I0 register (SPARC only) | help |
-ffixed-i1 | Reserve the I1 register (SPARC only) | help |
-ffixed-i2 | Reserve the I2 register (SPARC only) | help |
-ffixed-i3 | Reserve the I3 register (SPARC only) | help |
-ffixed-i4 | Reserve the I4 register (SPARC only) | help |
-ffixed-i5 | Reserve the I5 register (SPARC only) | help |
-ffixed-l0 | Reserve the L0 register (SPARC only) | help |
-ffixed-l1 | Reserve the L1 register (SPARC only) | help |
-ffixed-l2 | Reserve the L2 register (SPARC only) | help |
-ffixed-l3 | Reserve the L3 register (SPARC only) | help |
-ffixed-l4 | Reserve the L4 register (SPARC only) | help |
-ffixed-l5 | Reserve the L5 register (SPARC only) | help |
-ffixed-l6 | Reserve the L6 register (SPARC only) | help |
-ffixed-l7 | Reserve the L7 register (SPARC only) | help |
-ffixed-o0 | Reserve the O0 register (SPARC only) | help |
-ffixed-o1 | Reserve the O1 register (SPARC only) | help |
-ffixed-o2 | Reserve the O2 register (SPARC only) | help |
-ffixed-o3 | Reserve the O3 register (SPARC only) | help |
-ffixed-o4 | Reserve the O4 register (SPARC only) | help |
-ffixed-o5 | Reserve the O5 register (SPARC only) | help |
-ffixed-point | Enable fixed point types | help |
-ffixed-r10 | Reserve the r10 register (Hexagon/x86_64 only) | help |
-ffixed-r11 | Reserve the r11 register (Hexagon/x86_64 only) | help |
-ffixed-r12 | Reserve the r12 register (Hexagon/x86_64 only) | help |
-ffixed-r13 | Reserve the r13 register (Hexagon/x86_64 only) | help |
-ffixed-r14 | Reserve the r14 register (Hexagon/x86_64 only) | help |
-ffixed-r15 | Reserve the r15 register (Hexagon/x86_64 only) | help |
-ffixed-r16 | Reserve the r16 register (Hexagon/x86_64 only; | help |
-ffixed-r17 | Reserve the r17 register (Hexagon/x86_64 only; | help |
-ffixed-r18 | Reserve the r18 register (Hexagon/x86_64 only; | help |
-ffixed-r19 | Reserve register r19 (Hexagon/x86_64 only; | help |
-ffixed-r20 | Reserve the r20 register (Hexagon/x86_64 only; | help |
-ffixed-r21 | Reserve the r21 register (Hexagon/x86_64 only; | help |
-ffixed-r22 | Reserve the r22 register (Hexagon/x86_64 only; | help |
-ffixed-r23 | Reserve the r23 register (Hexagon/x86_64 only; | help |
-ffixed-r24 | Reserve the r24 register (Hexagon/x86_64 only; | help |
-ffixed-r25 | Reserve the r25 register (Hexagon/x86_64 only; | help |
-ffixed-r26 | Reserve the r26 register (Hexagon/x86_64 only; | help |
-ffixed-r27 | Reserve the r27 register (Hexagon/x86_64 only; | help |
-ffixed-r28 | Reserve the r28 register (Hexagon/x86_64 only; | help |
-ffixed-r29 | Reserve the r29 register (Hexagon/x86_64 only; | help |
-ffixed-r30 | Reserve the r30 register (Hexagon/x86_64 only; | help |
-ffixed-r31 | Reserve the r31 register (Hexagon/x86_64 only; | help |
-ffixed-r6 | Reserve register r6 (Hexagon only) | help |
-ffixed-r7 | Reserve register r7 (Hexagon only) | help |
-ffixed-r8 | Reserve the r8 register (Hexagon/x86_64 only) | help |
-ffixed-r9 | Reserve the r9 register (ARM/Hexagon/x86_64 only) | help |
-ffixed-x10 | Reserve the x10 register (AArch64/RISC-V only) | help |
-ffixed-x11 | Reserve the x11 register (AArch64/RISC-V only) | help |
-ffixed-x12 | Reserve the x12 register (AArch64/RISC-V only) | help |
-ffixed-x13 | Reserve the x13 register (AArch64/RISC-V only) | help |
-ffixed-x14 | Reserve the x14 register (AArch64/RISC-V only) | help |
-ffixed-x15 | Reserve the x15 register (AArch64/RISC-V only) | help |
-ffixed-x16 | Reserve the x16 register (RISC-V only) | help |
-ffixed-x17 | Reserve the x17 register (RISC-V only) | help |
-ffixed-x18 | Reserve the x18 register (AArch64/RISC-V only) | help |
-ffixed-x19 | Reserve the x19 register (RISC-V only) | help |
-ffixed-x1 | Reserve the x1 register (AArch64/RISC-V only) | help |
-ffixed-x20 | Reserve the x20 register (AArch64/RISC-V only) | help |
-ffixed-x21 | Reserve the x21 register (AArch64/RISC-V only) | help |
-ffixed-x22 | Reserve the x22 register (AArch64/RISC-V only) | help |
-ffixed-x23 | Reserve the x23 register (AArch64/RISC-V only) | help |
-ffixed-x24 | Reserve the x24 register (AArch64/RISC-V only) | help |
-ffixed-x25 | Reserve the x25 register (AArch64/RISC-V only) | help |
-ffixed-x26 | Reserve the x26 register (AArch64/RISC-V only) | help |
-ffixed-x27 | Reserve the x27 register (AArch64/RISC-V only) | help |
-ffixed-x28 | Reserve the x28 register (AArch64/RISC-V only) | help |
-ffixed-x29 | Reserve the x29 register (RISC-V only) | help |
-ffixed-x2 | Reserve the x2 register (AArch64/RISC-V only) | help |
-ffixed-x30 | Reserve the x30 register (RISC-V only) | help |
-ffixed-x31 | Reserve the x31 register (RISC-V only) | help |
-ffixed-x3 | Reserve the x3 register (AArch64/RISC-V only) | help |
-ffixed-x4 | Reserve the x4 register (AArch64/RISC-V only) | help |
-ffixed-x5 | Reserve the x5 register (AArch64/RISC-V only) | help |
-ffixed-x6 | Reserve the x6 register (AArch64/RISC-V only) | help |
-ffixed-x7 | Reserve the x7 register (AArch64/RISC-V only) | help |
-ffixed-x8 | Reserve the x8 register (RISC-V only) | help |
-ffixed-x9 | Reserve the x9 register (AArch64/RISC-V only) | help |
-fforce-check-cxx20-modules-input-files | Check the input source files from C++20 modules explicitly | help |
-fforce-dwarf-frame | Always emit a debug frame section | help |
-fforce-emit-vtables | Emits more virtual tables to improve devirtualization | help |
-fforce-enable-int128 | Enable support for int128_t type | help |
-ffp-contract value | Form fused FP ops (e.g. FMAs) | help |
-ffp-eval-method value | Specifies the evaluation method to use for floating-point arithmetic. | help |
-ffp-exception-behavior value | Specifies the exception behavior of floating-point operations. | help |
-ffp-model value | Controls the semantics of floating-point calculations. | help |
-ffreestanding | Assert that the compilation takes place in a freestanding environment | help |
-ffuchsia-api-level value | Set Fuchsia API level | help |
-ffunction-sections | Place each function in its own section | help |
-fglobal-isel | Enables the global instruction selector | help |
-fgnu-keywords | Allow GNU-extension keywords regardless of language standard | help |
-fgnu-runtime | Generate output compatible with the standard GNU Objective-C runtime | help |
-fgnu89-inline | Use the gnu89 inline semantics | help |
-fgnuc-version value | Sets various macros to claim compatibility with the given GCC version (default is 4.2.1) | help |
-fgpu-approx-transcendentals | Use approximate transcendental functions | help |
-fgpu-default-stream value | Specify default stream. | help |
-fgpu-defer-diag | Defer host/device related diagnostic messages for CUDA/HIP | help |
-fgpu-flush-denormals-to-zero | Flush denormal floating point values to zero in CUDA/HIP device mode. | help |
-fgpu-rdc | Generate relocatable device code, also known as separate compilation mode | help |
-fgpu-sanitize | Enable sanitizer for supported offloading devices | help |
-fheinous-gnu-extensions | (Deprecated) Controls whether '-Winvalid-gnu-asm-cast' defaults to an error or a warning | help |
-fhip-emit-relocatable | Compile HIP source to relocatable | help |
-fhip-fp32-correctly-rounded-divide-sqrt | Specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only) | help |
-fhip-kernel-arg-name | Specify that kernel argument names are preserved (HIP only) | help |
-fhip-new-launch-api | Use new kernel launching API for HIP | help |
-fhlsl-strict-availability | Enables strict availability diagnostic mode for HLSL built-in functions. | help |
-fhonor-infinities | Specify that floating-point optimizations are not allowed that assume arguments and results are not +-inf. | help |
-fhonor-nans | Specify that floating-point optimizations are not allowed that assume arguments and results are not NANs. | help |
-fignore-exceptions | Enable support for ignoring exception handling constructs | help |
-fimplicit-module-maps | Implicitly search the file system for module map files. | help |
-fimplicit-modules-lock-timeout seconds | Time to wait on an implicit module lock before timing out | help |
-fincremental-extensions | Enable incremental processing extensions such as processing statements on the global scope. | help |
-finline-functions | Inline suitable functions | help |
-finline-max-stacksize value | Suppress inlining of functions whose stack size exceeds the given value | help |
-finstrument-function-entry-bare | Instrument function entry only, after inlining, without arguments to the instrumentation call | help |
-finstrument-functions-after-inlining | Like -finstrument-functions, but insert the calls after inlining | help |
-finstrument-functions | Generate calls to instrument function entry and exit | help |
-fintegrated-as | Enable the integrated assembler | help |
-fintegrated-cc1 | Run cc1 in-process | help |
-fjmc | Enable just-my-code debugging | help |
-fjump-tables | Use jump tables for lowering switches | help |
-fkeep-persistent-storage-variables | Enable keeping all variables that have a persistent storage duration, including global, static and thread-local variables, to guarantee that they can be directly addressed | help |
-fkeep-static-consts | Keep static const variables even if unused | help |
-fkeep-system-includes | Instead of expanding system headers when emitting preprocessor output, preserve the #include directive. | help |
-flax-vector-conversions value | Enable implicit vector bit-casts | help |
-flifetime-dse | Aggressively delete stores after the end of an object's lifetime | help |
-floop-interchange | Enable the loop interchange pass | help |
-flto-jobs value | Controls the backend parallelism of -flto=thin (default of 0 means the number of threads will be derived from the number of CPUs detected) | help |
-flto-partitions value | Number of partitions to use for parallel full LTO codegen, ld.lld only. | help |
-flto auto | Enable LTO in 'full' mode | help |
-fmacro-backtrace-limit value | Set the maximum number of entries to print in a macro expansion backtrace (0 = no limit) | help |
-fmacro-prefix-map value | remap file source paths in predefined preprocessor macros and __builtin_FILE(). | help |
-fmath-errno | Require math functions to indicate errors by setting errno | help |
-fmatrix-memory-layout value | Sets the matrix memory layout (row-major or column-major) | help |
-fmax-tokens value | Max total number of preprocessed tokens for -Wmax-tokens. | help |
-fmax-type-align value | Specify the maximum alignment to enforce on pointers lacking an explicit alignment | help |
-fmemory-profile-use pathname | Use memory profile for profile-guided memory optimization | help |
-fmemory-profile directory | Enable heap memory profiling and dump results into <directory> | help |
-fmerge-all-constants | Allow merging of constants | help |
-fmessage-length value | Format message diagnostics so that they fit within N columns | help |
-fminimize-whitespace | Ignore the whitespace from the input file when emitting preprocessor output. | help |
-fmodule-file-deps value | Include module files in dependency output | help |
-fmodule-file name>=]<file | Specify the mapping of module name to precompiled module file, or load a module file if name is omitted. | help |
-fmodule-header kind | Build a C++20 Header Unit from a header that should be found in the user (fmodule-header=user) or system (fmodule-header=system) search path. | help |
-fmodule-map-file file | Load this module map file | help |
-fmodule-name name | Specify the name of the module to build | help |
-fmodule-output | Save intermediate module file results when compiling a standard C++ module unit. | help |
-fmodulemap-allow-subdirectory-search | Allow to search for module maps in subdirectories of search paths | help |
-fmodules-cache-path directory | Specify the module cache path | help |
-fmodules-decluse | Require declaration of modules used within a module | help |
-fmodules-disable-diagnostic-validation | Disable validation of the diagnostic options when loading the module | help |
-fmodules-driver | Enable support for driver managed module builds (experimental) | help |
-fmodules-embed-all-files value | Embed the contents of all files read by this compilation into the produced module file. | help |
-fmodules-force-validate-user-headers | Force validation of user headers when repeatedly loading a module file within single build session | help |
-fmodules-ignore-macro value | Ignore the definition of the given macro when building and loading modules | help |
-fmodules-prune-after seconds | Specify the interval (in seconds) after which a module file will be considered unused | help |
-fmodules-prune-interval seconds | Specify the interval (in seconds) between attempts to prune the module cache | help |
-fmodules-reduced-bmi | Generate the reduced BMI | help |
-fmodules-search-all | Search even non-imported modules to resolve references | help |
-fmodules-strict-decluse | Like -fmodules-decluse but requires all headers to be in modules | help |
-fmodules-user-build-path directory | Specify the module user build path | help |
-fmodules-validate-input-files-content | Validate PCM input files based on content if mtime differs | help |
-fmodules-validate-once-per-build-session | Don't verify input files for the modules if the module has been successfully validated or loaded during this build session | help |
-fmodules-validate-system-headers | Validate the system headers that a module depends on when loading the module | help |
-fmodules | Enable the 'modules' language feature | help |
-fms-anonymous-structs | Enable Microsoft anonymous struct/union extension. | help |
-fms-compatibility-version value | Dot-separated value representing the Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default)) | help |
-fms-compatibility | Enable full Microsoft Visual C++ compatibility | help |
-fms-define-stdc | Define '__STDC__' to '1' in MSVC Compatibility mode | help |
-fms-extensions | Accept some non-standard constructs supported by the Microsoft compiler | help |
-fms-hotpatch | Ensure that all functions can be hotpatched at runtime | help |
-fms-runtime-lib value | Select Windows run-time library | help |
-fms-secure-hotpatch-functions-file value | Path to a file that contains a list of mangled names of functions that should be hot-patched for Windows Secure Hot-Patching | help |
-fms-secure-hotpatch-functions-list value | List of mangled symbol names of functions that should be hot-patched for Windows Secure Hot-Patching | help |
-fms-volatile | Volatile loads and stores have acquire and release semantics | help |
-fmsc-version value | Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default)) | help |
-fnamed-loops | Enable support for named loops | help |
-fnew-infallible | Enable treating throwing global C++ operator new as always returning valid memory (annotates with __attribute__((returns_nonnull)) and throw()). | help |
-fno-aapcs-bitfield-width | Do not follow the AAPCS standard requirement stating that volatile bit-field width is dictated by the field container type. | help |
-fno-access-control | Disable C++ access control | help |
-fno-addrsig | Don't emit an address-significance table | help |
-fno-apinotes-modules | Disable module-based external API notes support | help |
-fno-apinotes | Disable external API notes support | help |
-fno-assume-sane-operator-new | Don't assume that C++'s global operator new can't alias any pointer | help |
-fno-assume-unique-vtables | Disable optimizations based on vtable pointer identity | help |
-fno-assumptions | Disable codegen and compile-time checks for C++23's [[assume]] attribute | help |
-fno-atomic-fine-grained-memory | Assume no atomic operations on fine-grained memory | help |
-fno-atomic-ignore-denormal-mode | Disallow atomic operations to ignore denormal mode | help |
-fno-atomic-remote-memory | Assume no atomic operations on remote memory | help |
-fno-auto-import | MinGW specific. | help |
-fno-autolink | Disable generation of linker directives for automatic library linking | help |
-fno-builtin- value | Disable implicit builtin knowledge of a specific function | help |
-fno-builtin | Disable implicit builtin knowledge of functions | help |
-fno-c++-static-destructors | Disable C++ static destructor registration | help |
-fno-char8_t | Disable C++ builtin type char8_t | help |
-fno-clangir | Use the AST -> LLVM pipeline to compile | help |
-fno-color-diagnostics | Disable colors in diagnostics | help |
-fno-common | Compile common globals like normal definitions | help |
-fno-complete-member-pointers | Do not require member pointer base types to be complete if they would be significant under the Microsoft ABI | help |
-fno-constant-nsarray-literals | Disable compile-time constant NSArray literals | help |
-fno-constant-nsdictionary-literals | Disable compile-time constant NSDictionary literals | help |
-fno-constant-nsnumber-literals | Disable compile-time constant NSNumber literals | help |
-fno-coverage-mapping | Disable code coverage analysis | help |
-fno-coverage-mcdc | Disable MC/DC coverage criteria | help |
-fno-crash-diagnostics | Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash | help |
-fno-cx-fortran-rules | Range reduction is disabled for complex arithmetic operations | help |
-fno-cx-limited-range | Basic algebraic expansions of complex arithmetic operations involving are disabled. | help |
-fno-cxx-modules | Disable modules for C++ | help |
-fno-debug-macro | Do not emit macro debug information | help |
-fno-debug-record-sysroot | Scrub the sysroot path from debug info. | help |
-fno-declspec | Disallow __declspec as a keyword | help |
-fno-define-target-os-macros | Disable predefined target OS macros | help |
-fno-delayed-template-parsing | Disable delayed template parsing | help |
-fno-delete-null-pointer-checks | Do not treat usage of null pointers as undefined behavior | help |
-fno-diagnostics-fixit-info | Do not include fixit information in diagnostics | help |
-fno-diagnostics-show-line-numbers | Show line numbers in diagnostic code snippets | help |
-fno-digraphs | Disallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' | help |
-fno-direct-access-external-data | Use GOT indirection to reference external data symbols | help |
-fno-disable-block-signature-string | Don't disable block signature string) | help |
-fno-discard-value-names | Do not discard value names in LLVM IR | help |
-fno-dollars-in-identifiers | Disallow '$' in identifiers | help |
-fno-elide-type | Do not elide types when printing diagnostics | help |
-fno-eliminate-unused-debug-types | Emit debug info for defined but unused types | help |
-fno-enable-new-pm-codegen | Do not use the NewPM for the Codegen Pipeline | help |
-fno-exceptions | Disable support for exception handling | help |
-fno-experimental-allow-pointer-field-protection-attr | Disallow the use of the [[clang::pointer_field_protection]] attribute | help |
-fno-experimental-late-parse-attributes | Disable experimental late parsing of attributes | help |
-fno-experimental-loop-fusion | DisableEnable the loop fusion pass | help |
-fno-experimental-pointer-field-protection-abi | Do not enable pointer field protection on all non-standard layout struct types | help |
-fno-experimental-pointer-field-protection-tagged | Do not use pointer identity (tag) to discriminate pointers of non-trivially-copyable types | help |
-fno-experimental-relative-c++-abi-vtables | Do not use the experimental C++ class ABI for classes with virtual tables | help |
-fno-experimental-sanitize-metadata value | Disable emitting metadata for binary analysis sanitizers | help |
-fno-fat-lto-objects | Disable fat LTO object support | help |
-fno-file-reproducible | Use the host's platform-specific path separator character when expanding the __FILE__ macro | help |
-fno-fine-grained-bitfield-accesses | Use large-integer access for consecutive bitfield runs. | help |
-fno-finite-loops | Do not assume that any loop is finite. | help |
-fno-fixed-point | Disable fixed point types | help |
-fno-force-enable-int128 | Disable support for int128_t type | help |
-fno-global-isel | Disables the global instruction selector | help |
-fno-gnu-inline-asm | Disable GNU style inline asm | help |
-fno-gpu-allow-device-init | Don't allow device side init function in HIP (experimental) | help |
-fno-gpu-approx-transcendentals | Don't use approximate transcendental functions | help |
-fno-gpu-defer-diag | Don't defer host/device related diagnostic messages for CUDA/HIP | help |
-fno-hip-emit-relocatable | Do not override toolchain to compile HIP source to relocatable | help |
-fno-hip-fp32-correctly-rounded-divide-sqrt | Don't specify that single precision floating-point divide and sqrt used in the program source are correctly rounded (HIP device compilation only) | help |
-fno-hip-kernel-arg-name | Don't specify that kernel argument names are preserved (HIP only) | help |
-fno-integrated-as | Disable the integrated assembler | help |
-fno-integrated-cc1 | Spawn a separate process for each cc1 | help |
-fno-integrated-objemitter | Use external machine object code emitter. | help |
-fno-jump-tables | Do not use jump tables for lowering switches | help |
-fno-keep-persistent-storage-variables | Disable keeping all variables that have a persistent storage duration, including global, static and thread-local variables, to guarantee that they can be directly addressed | help |
-fno-knr-functions | Disable support for K&R C function declarations | help |
-fno-lifetime-dse | Do not aggressively delete stores after the end of an object's lifetime | help |
-fno-loop-interchange | Disable the loop interchange pass | help |
-fno-lto | Disable LTO mode (default) | help |
-fno-memory-profile | Disable heap memory profiling | help |
-fno-merge-all-constants | Disallow merging of constants | help |
-fno-modules-driver | Disable support for driver managed module builds (experimental) | help |
-fno-modules-force-validate-user-headers | Do not force validation of user headers when repeatedly loading a module file within single build session | help |
-fno-modules-validate-textual-header-includes | Do not enforce -fmodules-decluse and private header restrictions for textual headers. | help |
-fno-ms-anonymous-structs | Disable Microsoft anonymous struct/union extension. | help |
-fno-ms-tls-guards | Do not emit code to perform on-demand initialization of thread-local variables | help |
-fno-new-infallible | Disable treating throwing global C++ operator new as always returning valid memory (annotates with __attribute__((returns_nonnull)) and throw()). | help |
-fno-objc-avoid-heapify-local-blocks | Don't try to avoid heapifying local blocks | help |
-fno-objc-constant-literals | Disable compile-time constant ObjC literals | help |
-fno-objc-infer-related-result-type | do not infer Objective-C related result type based on method family | help |
-fno-offload-lto | Disable LTO mode (default) for offload compilation | help |
-fno-offload-uniform-block | Don't assume that kernels are launched with uniform block sizes (default true for CUDA/HIP and false otherwise) | help |
-fno-offload-via-llvm | Don't use LLVM/Offload as portable offloading runtime. | help |
-fno-openmp-extensions | Disable all Clang extensions for OpenMP directives and clauses | help |
-fno-openmp-simd | Do not emit code for any OpenMP constructs. | help |
-fno-operator-names | Do not treat C++ operator name keywords as synonyms for operators | help |
-fno-optimize-sibling-calls | Disable tail call optimization, keeping the call stack accurate | help |
-fno-partition-static-data-sections | Disable partition static data sections using PGO profile information and MemProf (x86 and aarch64 ELF). | help |
-fno-pch-codegen | Do not generate code for uses of this PCH that assumes an explicit object file will be built for the PCH | help |
-fno-pch-debuginfo | Do not generate debug info for types in an object file built from this PCH and do not generate them elsewhere | help |
-fno-plt | Use GOT indirection instead of PLT to make external function calls (x86 only) | help |
-fno-preserve-as-comments | Do not preserve comments in inline assembly | help |
-fno-profile-generate | Disable generation of profile instrumentation. | help |
-fno-profile-instr-generate | Disable generation of profile instrumentation. | help |
-fno-profile-instr-use | Disable using instrumentation data for profile-guided optimization | help |
-fno-pseudo-probe-for-profiling | Do not emit pseudo probes for sample profiling | help |
-fno-raw-string-literals | Disable raw string literals | help |
-fno-register-global-dtors-with-atexit | Don't use atexit or __cxa_atexit to register global destructors | help |
-fno-rtlib-add-rpath | Do not add -rpath with architecture-specific resource directory to the linker flags. | help |
-fno-rtlib-defaultlib | On Windows, do not emit /defaultlib: directives to link compiler-rt libraries | help |
-fno-rtti-data | Disable generation of RTTI data | help |
-fno-rtti | Disable generation of rtti information | help |
-fno-sanitize-address-globals-dead-stripping | Disable linker dead stripping of globals in AddressSanitizer | help |
-fno-sanitize-address-outline-instrumentation | Use default code inlining logic for the address sanitizer | help |
-fno-sanitize-address-poison-custom-array-cookie | Disable poisoning array cookies when using custom operator new[] in AddressSanitizer | help |
-fno-sanitize-address-use-after-scope | Disable use-after-scope detection in AddressSanitizer | help |
-fno-sanitize-address-use-odr-indicator | Disable ODR indicator globals | help |
-fno-sanitize-alloc-token-extended | Disable extended coverage to custom allocation functions | help |
-fno-sanitize-alloc-token-fast-abi | Use the default AllocToken ABI | help |
-fno-sanitize-annotate-debug-info value | Do not allow compiler to annotate sanitizer instrumentation with extra debug info for the specified sanitizers | help |
-fno-sanitize-cfi-canonical-jump-tables | Do not make the jump table addresses canonical in the symbol table | help |
-fno-sanitize-cfi-cross-dso | Disable control flow integrity (CFI) checks for cross-DSO calls. | help |
-fno-sanitize-coverage value | Disable features of coverage instrumentation for Sanitizers | help |
-fno-sanitize-debug-trap-reasons | Alias for -fsanitize-debug-trap-reasons=none | help |
-fno-sanitize-handler-preserve-all-regs | Disable handlers with preserve_all calling convention | help |
-fno-sanitize-hwaddress-experimental-aliasing | Disable aliasing mode in HWAddressSanitizer | help |
-fno-sanitize-ignorelist | Don't use ignorelist file for sanitizers | help |
-fno-sanitize-memory-param-retval | Disable detection of uninitialized parameters and return values | help |
-fno-sanitize-memory-track-origins | Disable origins tracking in MemorySanitizer | help |
-fno-sanitize-memory-use-after-dtor | Disable use-after-destroy detection in MemorySanitizer | help |
-fno-sanitize-merge value | Do not allow compiler to merge handlers for specified sanitizers | help |
-fno-sanitize-recover value | Disable recovery for specified sanitizers | help |
-fno-sanitize-stable-abi | Conventional ABI instrumentation for sanitizer runtime. | help |
-fno-sanitize-stats | Disable sanitizer statistics gathering. | help |
-fno-sanitize-thread-atomics | Disable atomic operations instrumentation in ThreadSanitizer | help |
-fno-sanitize-thread-func-entry-exit | Disable function entry/exit instrumentation in ThreadSanitizer | help |
-fno-sanitize-thread-memory-access | Disable memory access instrumentation in ThreadSanitizer | help |
-fno-sanitize-trap value | Disable trapping for specified sanitizers | help |
-fno-sanitize-type-outline-instrumentation | Use code inlining logic for the type sanitizer | help |
-fno-short-wchar | Force wchar_t to be an unsigned int | help |
-fno-show-column | Do not include column number on diagnostics | help |
-fno-show-source-location | Do not include source location information with diagnostics | help |
-fno-signed-char | char is unsigned | help |
-fno-signed-zeros | Allow optimizations that ignore the sign of floating point zeros | help |
-fno-skip-odr-check-in-gmf | Perform ODR checks for decls in the global module fragment. | help |
-fno-spell-checking | Disable spell-checking | help |
-fno-split-machine-functions | Disable late function splitting using profile information (x86 and aarch64 ELF) | help |
-fno-split-stack | Wouldn't use segmented stack | help |
-fno-stack-clash-protection | Disable stack clash protection | help |
-fno-stack-protector | Disable the use of stack protectors | help |
-fno-standalone-debug | Limit debug information produced to reduce size of debug binary | help |
-fno-strict-aliasing | Disable optimizations based on strict aliasing rules | help |
-fno-strict-bool value | Disable optimizations based on bool bit patterns never being anything other than 0 or 1, specifying a conversion behavior. | help |
-fno-strict-float-cast-overflow | Relax language rules and try to match the behavior of the target's native float-to-int conversion instructions | help |
-fno-strict-return | Don't treat control flow paths that fall off the end of a non-void function as unreachable | help |
-fno-swift-version-independent-apinotes | Disable version-independent external API notes support | help |
-fno-sycl | Disable SYCL C++ extensions | help |
-fno-temp-file | Directly create compilation output files. | help |
-fno-trigraphs | Do not process trigraph sequences | help |
-fno-unified-lto | Use distinct LTO pipelines | help |
-fno-unique-section-names | Don't use unique names for text and data sections | help |
-fno-unroll-loops | Turn off loop unroller | help |
-fno-use-cxa-atexit | Don't use __cxa_atexit for calling destructors | help |
-fno-use-init-array | Use .ctors/.dtors instead of .init_array/.fini_array | help |
-fno-verify-intermediate-code | Disable verification of LLVM IR | help |
-fno-visibility-inlines-hidden-static-local-var | Disables -fvisibility-inlines-hidden-static-local-var (this is the default on non-darwin targets) | help |
-fno-xray-function-index | Omit function index section at the expense of single-function patching performance | help |
-fno-zero-initialized-in-bss | Don't place zero initialized data in BSS | help |
-fno-zos-extensions | Do not accept non-standard constructs supported by the z/OS compiler | help |
-fobjc-arc-exceptions | Use EH-safe code when synthesizing retains and releases in -fobjc-arc | help |
-fobjc-arc | Synthesize retain and release calls for Objective-C pointers | help |
-fobjc-avoid-heapify-local-blocks | Try to avoid heapifying local blocks | help |
-fobjc-constant-literals | Enable compile-time constant ObjC literals | help |
-fobjc-direct-precondition-thunk | Move precondition checks for direct methods into thunks | help |
-fobjc-disable-direct-methods-for-testing | Ignore attribute objc_direct so that direct methods can be tested | help |
-fobjc-encode-cxx-class-template-spec | Fully encode c++ class template specialization | help |
-fobjc-exceptions | Enable Objective-C exceptions | help |
-fobjc-runtime value | Specify the target Objective-C runtime kind and version | help |
-fobjc-weak | Enable ARC-style weak references in Objective-C | help |
-foffload-implicit-host-device-templates | Template functions or specializations without host, device and global attributes have implicit host device attributes (CUDA/HIP only) | help |
-foffload-lto value | Set LTO mode for offload compilation | help |
-foffload-via-llvm | Use LLVM/Offload as portable offloading runtime. | help |
-fomit-frame-pointer | Omit the frame pointer from functions that don't need it. | help |
-fopenacc | Enable OpenACC | help |
-fopenmp-extensions | Enable all Clang extensions for OpenMP directives and clauses | help |
-fopenmp-force-usm | Force behavior as if the user specified pragma omp requires unified_shared_memory. | help |
-fopenmp-offload-mandatory | Do not create a host fallback if offloading to the device fails. | help |
-fopenmp-simd | Emit OpenMP code only for SIMD-based constructs. | help |
-fopenmp-target-debug | Enable debugging in the OpenMP offloading device RTL | help |
-fopenmp-target-jit | Emit code that can be JIT compiled for OpenMP offloading. | help |
-fopenmp-targets value | Specify comma-separated list of triples OpenMP offloading targets to be supported | help |
-fopenmp-version value | Set OpenMP version (e.g. 45 for OpenMP 4.5, 51 for OpenMP 5.1). | help |
-fopenmp | Parse OpenMP pragmas and generate parallel code. | help |
-foperator-arrow-depth value | Maximum number of 'operator->'s to call for a member access | help |
-foptimization-record-file file | Specify the output name of the file containing the optimization remarks. | help |
-foptimization-record-passes regex | Only include passes which match a specified regular expression in the generated optimization record (by default, include all passes) | help |