OVERVIEW: clang LLVM compiler
USAGE: clang-15 [options] file...
OPTIONS:
-### Print (but do not run) the commands to run for this compilation
--amdgpu-arch-tool=<value>
Tool used for detecting AMD GPU arch in the system.
--analyzer-output <value>
Static analyzer report output format (html|plist|plist-multi-file|plist-html|sarif|sarif-html|text).
--analyze Run the static analyzer
-arcmt-migrate-emit-errors
Emit ARC errors even if the migrator can fix them
-arcmt-migrate-report-output <value>
Output path for the plist report
-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
-cc1-args <value> pass cc1 options to depscan afterwards
-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.
--config=<file> Specify configuration file
--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
-dump-depscan-tree=<value>
emit the CAS identifier for the tree instead of the full -cc1
-D <macro>=<value> Define <macro> to <value> (or 1 if <value> omitted)
-emit-ast Emit Clang AST files for source inputs
-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.
--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).
-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
-fallow-editor-placeholders
Treat editor placeholders as valid source code
-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-cache-path=<directory>
Does nothing; API notes are no longer cached separately from modules
-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
-fasync-exceptions Enable EH Asynchronous exceptions
-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.
-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)
-fcf-protection=<value> Instrument control-flow architecture protection
-fcf-protection Enable cf-protection in 'full' mode
-fchar8_t Enable C++ builtin type char8_t
-fclang-abi-compat=<version>
Attempt to match the ABI of Clang <version>
-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
-fconvergent-functions Assume functions may be convergent
-fcoro-aligned-allocation
Prefer aligned allocation for C++ Coroutines
-fcoroutines-ts Enable support for the C++ Coroutines TS
-fcoverage-compilation-dir=<value>
The compilation directory to embed in the coverage mapping.
-fcoverage-mapping Generate coverage mapping to enable code coverage analysis
-fcoverage-prefix-map=<value>
remap file source paths in coverage mapping
-fcrash-diagnostics-dir=<dir>
Put crash-report files in <dir>
-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-approx-transcendentals
Use approximate transcendental functions
-fcuda-short-ptr Use 32-bit pointers for accessing const/local/shared address spaces
-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=<value>
remap file source paths in debug info
-fdebug-ranges-base-address
Use DWARF base address selection entries in .debug_ranges
-fdebug-types-section Place debug types in their own section (ELF Only)
-fdeclspec Allow __declspec as a keyword
-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)
-fdepscan-daemon=<value>
Specify the path to the daemon to be used. Clang will use the daemon specified, rather than try to spawn its own based on parent processes.
-fdepscan-include-tree Set dep-scanner to produce the include tree
-fdepscan-prefix-map-sdk=<new>
With -fdepscan, auto-detect the SDK path on-disk and remap it to the given path (see -fdepscan-prefix-map=).
-fdepscan-prefix-map-toolchain=<new>
With -fdepscan, auto-detect the toolchain path on-disk and remap it to the given path (see -fdepscan-prefix-map=).
-fdepscan-prefix-map=<old>=<new>
With -fdepscan, seamlessly filter the CAS filesystem to apply the given prefix, updating the command-line to match.
-fdepscan-share-identifier <value>
Share depscan daemon for Clang invocations using the same string identifier.
-fdepscan-share-parent=<value>
Share state based on the PID of the parent command if the name matches. See also -fdepscan-share-stop.
-fdepscan-share-parent Share state based on the PID of the parent command. See also -fdepscan-share-stop.
-fdepscan-share-stop=<value>
Stop looking for the command named by -fdepscan-share if a process with the name of the provided argument is found first. Also blocks -fdepscan-share=parent if the parent has this name. E.g., -fdepscan -fdepscan-share=ninja -fdepscan-share-stop=cmake looks for 'ninja' and 'cmake' in the process tree; if 'ninja' is found first, state is shared based on ninja's PID; if 'cmake' is found first, state is not shared.
-fdepscan-share=<value> If the argument is the name of a command in the process tree, share state based on its PID. E.g., -fdepscan -fdepscan-share=ninja will search for 'ninja' in the process tree and share state based on its PID if found. See also -fdepscan-share-stop.
-fdepscan=<value> Scan for dependencies ahead of compiling, generating a pruned CAS tree to send to -fcas-fs. Values are 'auto', 'daemon' (see -fdepscan-share and -fdepscan-share-parent), 'inline', or 'off' (default).
-fdepscan Turn on -fdepscan=auto.
-fdiagnostics-absolute-paths
Print absolute paths 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-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
-fdiscard-value-names Discard value names in LLVM IR
-fdollars-in-identifiers
Allow '$' in identifiers
-fdouble-square-bracket-attributes
Enable '[[]]' attributes in all C and C++ language modes
-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-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
-fexceptions Enable support for exception handling
-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-new-constant-interpreter
Enable the experimental new constant interpreter
-fexperimental-relative-c++-abi-vtables
Use the experimental C++ class ABI for classes with virtual tables
-fexperimental-sanitize-metadata=<value>
Specify the type of metadata to emit for binary analysis sanitizers
-fexperimental-strict-floating-point
Enables experimental strict floating point in LLVM.
-fextend-arguments=<value>
Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions
-ffast-math Allow aggressive, lossy floating-point optimizations
-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, 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 loops are finite.
-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-point Enable fixed point types
-ffixed-r19 Reserve register r19 (Hexagon only)
-ffixed-r9 Reserve the r9 register (ARM 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 (AArch64/RISC-V only)
-ffixed-x17 Reserve the x17 register (AArch64/RISC-V only)
-ffixed-x18 Reserve the x18 register (AArch64/RISC-V only)
-ffixed-x19 Reserve the x19 register (AArch64/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 (AArch64/RISC-V only)
-ffixed-x2 Reserve the x2 register (AArch64/RISC-V only)
-ffixed-x30 Reserve the x30 register (AArch64/RISC-V only)
-ffixed-x31 Reserve the x31 register (AArch64/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 (AArch64/RISC-V only)
-ffixed-x9 Reserve the x9 register (AArch64/RISC-V only)
-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): fast (fuses across statements disregarding pragmas) | on (only fuses in the same statement unless dictated by pragmas) | off (never fuses) | fast-honor-pragmas (fuses across statements unless diectated by pragmas). Default is 'fast' for CUDA, 'fast-honor-pragmas' for HIP, and 'on' otherwise.
-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-default-stream=<value>
Specify default stream. The default value is 'legacy'. (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 AMDGPU target
-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
-fignore-exceptions Enable support for ignoring exception handling constructs
-fimplicit-module-maps Implicitly search the file system for module map files.
-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-static-consts Keep static const variables if unused
-flax-vector-conversions=<value>
Enable implicit vector bit-casts
-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=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-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
-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=<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 Minimize whitespace when emitting preprocessor 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-related-to-pch Mark module as related to a PCH
-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-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-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-ts Enable support for the C++ Modules TS
-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-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-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
-fmsc-version=<value> Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default))
-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-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-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-coverage-mapping Disable code coverage analysis
-fno-crash-diagnostics Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash
-fno-cuda-approx-transcendentals
Don't use approximate transcendental functions
-fno-cxx-modules Disable modules for C++
-fno-debug-macro Do not emit macro debug information
-fno-declspec Disallow __declspec as a keyword
-fno-delayed-template-parsing
Disable delayed template parsing
-fno-delete-null-pointer-checks
Do not treat usage of null pointers as undefined behavior
-fno-depscan-share Turn off -fdepscan-share and -fdepscan-share-parent.
-fno-diagnostics-fixit-info
Do not include fixit information in diagnostics
-fno-digraphs Disallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:'
-fno-direct-access-external-data
Use GOT indirection to reference external data symbols
-fno-discard-value-names
Do not discard value names in LLVM IR
-fno-dollars-in-identifiers
Disallow '$' in identifiers
-fno-double-square-bracket-attributes
Disable '[[]]' attributes in all C and C++ language modes
-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-exceptions Disable support for exception handling
-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-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-defer-diag Don't defer host/device related diagnostic messages for CUDA/HIP
-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-static-consts Don't keep static const variables if unused
-fno-knr-functions Disable support for K&R C function declarations
-fno-lto Disable LTO mode (default)
-fno-memory-profile Disable heap memory profiling
-fno-merge-all-constants
Disallow merging of constants
-fno-modules-check-relocated<value>
Skip checks for relocated modules when loading PCM files
-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-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-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-openmp-extensions Disable all Clang extensions for OpenMP directives and clauses
-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-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-ptrauth-abi-version
Disable Pointer Authentication ABI versioning
-fno-ptrauth-kernel-abi-version
Disable Pointer Authentication kernel ABI versioning
-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
-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-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-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-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=<value>
Disable trapping for specified sanitizers
-fno-sanitize-trap Disable trapping for all sanitizers
-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-spell-checking Disable spell-checking
-fno-split-machine-functions
Disable late function splitting using profile information (x86 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-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-sycl Disables SYCL kernels compilation for device
-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-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-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
-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-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-lto=<value> Set LTO mode for offload compilation
-foffload-lto Enable LTO in 'full' mode for offload compilation
-fopenmp-extensions Enable all Clang extensions for OpenMP directives and clauses
-fopenmp-implicit-rpath Set rpath on OpenMP executables
-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-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, 50 for OpenMP 5.0). Default value is 50.
-fopenmp Parse OpenMP pragmas and generate parallel code.
-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)
-forder-file-instrumentation
Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var)
-fpack-struct=<value> Specify the default maximum struct packing alignment
-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>
Generate M NOPs before function entry and N-M NOPs after function entry
-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
-fproc-stat-report=<value>
Save subprocess statistics to the given file
-fproc-stat-report<value>
Print subprocess statistics
-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=<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
-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-abi-version=<value>
Pointer Authentication ABI version
-fptrauth-auth-traps Enable traps on authentication failures
-fptrauth-calls Enable signing and authentication of all indirect calls
-fptrauth-indirect-gotos
Enable signing and authentication of indirect goto targets
-fptrauth-intrinsics Enable pointer-authentication intrinsics
-fptrauth-kernel-abi-version
Enable Pointer Authentication kernel ABI version
-fptrauth-returns Enable signing and authentication of return addresses
-fptrauth-soft Enable software lowering of pointer authentication
-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
-freciprocal-math Allow division operations to be reassociated
-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
-frelaxed-template-template-args
Enable C++17 relaxed template template argument matching
-freroll-loops Turn on loop reroller
-fropi Generate read-only position independent code (ARM only)
-frtlib-add-rpath Add -rpath with architecture-specific resource directory to the linker flags
-frwpi Generate read-write position independent code (ARM only)
-fsanitize-address-destructor=<value>
Set destructor type used in ASan instrumentation
-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-blacklist=<value>
Alias for -fsanitize-ignorelist=
-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-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=<value>
Specify the type of coverage instrumentation for Sanitizers
-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-ignorelist=<value>
Path to ignorelist file for sanitizers
-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-recover=<value>
Enable recovery for specified sanitizers
-fsanitize-stable-abi Stable ABI instrumentation for sanitizer runtime. Default: Conventional
-fsanitize-stats Enable sanitizer statistics gathering.
-fsanitize-system-blacklist=<value>
Alias for -fsanitize-system-ignorelist=
-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=<value> Enable trapping for specified sanitizers
-fsanitize-trap Enable trapping for all sanitizers
-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
-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
-fslp-vectorize Enable the superword-level parallelism vectorization passes
-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 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-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
-fsuppress-conflicting-types
Ignore errors from conflicting types in function declarations
-fswift-async-fp=<option>
Control emission of Swift async extended frame info
-fsycl Enables SYCL kernels compilation for device
-fsyntax-only Run the preprocessor, parser and semantic analysis stages
-fsystem-module Build this module as a system module. Only used with -emit-module
-fthin-link-bitcode=<value>
Write minimized bitcode to <file> for the ThinLTO thin link only
-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=<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-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'
-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
-funroll-loops Turn on loop unroller
-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
-fvectorize Enable the loop vectorization passes
-fverbose-asm Generate verbose assembly output
-fvirtual-function-elimination
Enables dead virtual function elimination optimization. Requires -flto=full
-fvisibility-dllexport=<value>
The visibility for dllexport definitions [-fvisibility-from-dllstorageclass]
-fvisibility-externs-dllimport=<value>
The visibility for dllimport external declarations [-fvisibility-from-dllstorageclass]
-fvisibility-externs-nodllstorageclass=<value>
The visibility for external declarations without an explicit DLL dllstorageclass [-fvisibility-from-dllstorageclass]
-fvisibility-from-dllstorageclass
Set the visibility of symbols in the generated code from their DLL storage class
-fvisibility-global-new-delete-hidden
Give global C++ operator new and delete declarations hidden visibility
-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 export class [-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
-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 Tells clang to add the link dependencies for XRay.
-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
-fzero-call-used-regs=<value>
Clear call-used registers upon function return (AArch64/x86 only)
-fzvector Enable System z vector language extension
-F <value> Add directory to framework include search path
--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
-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
-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)
-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-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
-greproducible Tune debug info to be reproducible.
-gsplit-dwarf=<value> Set DWARF fission mode
-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.
-H Show header includes and nesting depth
-I- Restrict all prior -I flags to double-quoted inclusion and remove current directory from include path
-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
-imacros <file> Include macros from file before parsing
-include-pch <file> Include precompiled header file
-include <file> Include file before parsing
-index-header-map Make the next included directory (-I or -F) an indexer header map
-index-ignore-macros Ignore macros during indexing
-index-ignore-pcms Ignore symbols from imported pcm modules
-index-ignore-system-symbols
Ignore symbols from system headers
-index-record-codegen-name
Record the codegen name for symbols
-index-store-path <value>
Enable indexing with the specified data store path
-index-unit-output-path <path>
Use <path> as the output path for this compilation unit in the index unit file
-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
--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
-L <dir> Add directory to library search path
-mabi=quadword-atomics Enable quadword atomics ABI on AIX (AIX PPC64 only). Uses lqarx/stqcx. instructions.
-mabi=vec-default Enable the default Altivec ABI on AIX (AIX only). Uses only volatile vector registers.
-mabi=vec-extabi Enable the extended Altivec ABI on AIX (AIX only). Uses volatile and nonvolatile vector registers
-mabicalls Enable SVR4-style position-independent code (Mips only)
-maix-struct-return Return all structs in memory (PPC32 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)
-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)
-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
-mcmodel=medany Equivalent to -mcmodel=medium, compatible with RISC-V gcc.
-mcmodel=medlow Equivalent to -mcmodel=small, compatible with RISC-V gcc.
-mcmse Allow use of CMSE (Armv8-M Security Extensions)
-mcode-object-v3 Legacy option to specify code object ABI V3 (AMDGPU only)
-mcode-object-version=<value>
Specify code object ABI version. Defaults to 4. (AMDGPU only)
-mcrc Allow use of CRC instructions (ARM/Mips only)
-mcumode Specify CU wavefront execution mode (AMDGPU only)
-mdefault-visibility-export-mapping=<value>
Mapping between default visibility and export
-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.
-menable-unsafe-fp-math Allow unsafe floating-point math optimizations which may decrease precision
-mexec-model=<value> Execution model (WebAssembly only)
-mexecute-only Disallow generation of data access to code sections (ARM 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 Workaround Cortex-A53 erratum 835769 (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)
-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).
-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 Enable Hexagon HVX QFloat instructions
-mhvx=<value> Enable Hexagon Vector eXtensions
-mhvx Enable Hexagon Vector eXtensions
-miamcu Use Intel MCU ABI
-mibt-seal Optimize fcf-protection=branch/full (requires LTO).
-mignore-xcoff-visibility
Not emit the visibility attribute for asm in AIX OS or give all symbols 'unspecified' visibility in XCOFF object file
--migrate Run the migrator
-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
-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
-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-bti-at-return-twice
Do not add a BTI instruction after a setjmp or other return-twice construct (Arm/AArch64 only)
-mno-code-object-v3 Legacy option to specify code object ABI V2 (AMDGPU only)
-mno-crc Disallow use of CRC instructions (Mips only)
-mno-cumode Specify WGP wavefront execution mode (AMDGPU only)
-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 (ARM 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 workaround Cortex-A53 erratum 835769 (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-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 instructions
-mno-incremental-linker-compatible
(integrated-as) Emit an object file which cannot be used with an incremental linker
-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-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 only)
-mno-packets Disable generation of instruction packets
-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-seses Disable speculative execution side effect suppression (SESES)
-mno-stack-arg-probe Disable stack probes which are enabled by default
-mno-tgsplit Disable threadgroup split execution mode (AMDGPU only)
-mno-tls-direct-seg-refs
Disable direct TLS access through segment registers
-mno-unaligned-access Force all memory accesses to be aligned (AArch32/AArch64 only)
-mno-wavefrontsize64 Specify wavefront size 32 mode (AMDGPU only)
-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 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
-mprefer-vector-width=<value>
Specifies preferred vector width for auto-vectorization. Defaults to 'none' which allows target specific decisions.
-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
-mrecord-mcount Generate a __mcount_loc section entry for each __fentry__ call.
-mrelax-all (integrated-as) Relax all machine instructions
-mrelax Enable linker relaxation
-mrestrict-it Disallow generation of complex IT blocks.
-mrtd Make StdCall calling convention the default
-msave-restore Enable using library calls for save and restore
-mseses Enable speculative execution side effect suppression (SESES). Includes LVI control flow integrity mitigations
-msign-return-address=<value>
Select return address signing scope
-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
-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-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>
Use the given guard (global, tls) for addressing the stack-protector guard
-mstackrealign Force realign the stack at entry to every function
-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-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)
-mtp=<value> Thread pointer access method (AArch32/AArch64 only)
-mtune=<value> Only supported on AArch64, PowerPC, RISC-V, SystemZ, and X86
-MT <value> Specify name of main file output in depfile
-munaligned-access Allow memory accesses to be unaligned (AArch32/AArch64 only)
-munsafe-fp-atomics Enable unsafe floating point atomic instructions (AMDGPU only)
-mvscale-max=<value> Specify the vscale maximum. Defaults to the vector length agnostic value of "0". (AArch64 only)
-mvscale-min=<value> Specify the vscale minimum. Defaults to "1". (AArch64 only)
-MV Use NMake/Jom format for the depfile
-mwavefrontsize64 Specify wavefront size 64 mode (AMDGPU only)
-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-new-driver Don't Use the new driver for offloading compilation.
--no-system-header-prefix=<prefix>
Treat all #include paths starting with <prefix> as not including a system header.
-nobuiltininc Disable builtin #include directories
-nogpuinc Do not add include paths for CUDA/HIP and do not include the default CUDA/HIP wrapper headers
-nogpulib Do not link device library for CUDA/HIP device compilation
-nohipwrapperinc Do not include the default HIP wrapper headers and include paths
-nostdinc++ Disable standard #include directories for the C++ standard library
-ObjC++ Treat source input files as Objective-C++ inputs
-objcmt-allowlist-dir-path=<value>
Only modify files with a filename contained in the provided directory path
-objcmt-atomic-property Make migration to 'atomic' properties
-objcmt-migrate-all Enable migration to modern ObjC
-objcmt-migrate-annotation
Enable migration to property and method annotations
-objcmt-migrate-designated-init
Enable migration to infer NS_DESIGNATED_INITIALIZER for initializer methods
-objcmt-migrate-instancetype
Enable migration to infer instancetype for method result type
-objcmt-migrate-literals
Enable migration to modern ObjC literals
-objcmt-migrate-ns-macros
Enable migration to NS_ENUM/NS_OPTIONS macros
-objcmt-migrate-property-dot-syntax
Enable migration of setter/getter messages to property-dot syntax
-objcmt-migrate-property
Enable migration to modern ObjC property
-objcmt-migrate-protocol-conformance
Enable migration to add protocol conformance on classes
-objcmt-migrate-readonly-property
Enable migration to modern ObjC readonly property
-objcmt-migrate-readwrite-property
Enable migration to modern ObjC readwrite property
-objcmt-migrate-subscripting
Enable migration to modern ObjC subscripting
-objcmt-ns-nonatomic-iosonly
Enable migration to use NS_NONATOMIC_IOSONLY macro for setting property's 'atomic' attribute
-objcmt-returns-innerpointer-property
Enable migration to annotate property with NS_RETURNS_INNER_POINTER
-objcmt-whitelist-dir-path=<value>
Alias for -objcmt-allowlist-dir-path
-ObjC Treat source input files as Objective-C inputs
-object-file-name=<file>
Set the output <file> for debug infos
--offload-arch=<value> CUDA offloading device architecture (e.g. sm_35), or HIP offloading target ID in the form of a device architecture followed by target ID features delimited by a colon. Each target ID feature is a pre-defined string followed by a plus or minus sign (e.g. gfx908:xnack+:sramecc-). May be specified more than once.
--offload-device-only Only compile for the offloading device.
--offload-host-device Only compile for the offloading host.
--offload-host-only Only compile for the offloading host.
--offload-link Use the new offloading linker to perform the link job.
--offload-new-driver Use the new driver for offloading compilation.
--offload=<value> Specify comma-separated list of offloading target triples (CUDA and HIP only)
-o <file> Write output to <file>
-pedantic Warn on language extensions
-pg Enable mcount instrumentation
-pipe Use pipes between commands, when possible
--precompile Only precompile the input
-print-diagnostic-options
Print all of Clang's warning options
-print-effective-triple Print the effective target triple
-print-file-name=<file> Print the full library path of <file>
-print-ivar-layout Enable Objective-C Ivar layout bitmap print trace
-print-libgcc-file-name Print the library path for the currently used compiler runtime library ("libgcc.a" or "libclang_rt.builtins.*.a")
-print-prog-name=<name> Print the full program path of <name>
-print-resource-dir Print the resource directory pathname
-print-rocm-search-dirs Print the paths used for finding ROCm installation
-print-runtime-dir Print the directory pathname containing clangs runtime libraries
-print-search-dirs Print the paths used for finding libraries and programs
-print-supported-cpus Print supported cpu models for the given target (if target is not specified, it will print the supported cpus for the default target)
-print-target-triple Print the normalized target triple
-print-targets Print the registered targets
-pthread Support POSIX threads in generated code
--ptxas-path=<value> Path to ptxas (used for compiling CUDA code)
-P Disable linemarker output in -E mode
-Qn Do not emit metadata containing compiler name and version
-Qunused-arguments Don't emit warning for unused driver arguments
-Qy Emit metadata containing compiler name and version
-relocatable-pch Whether to build a relocatable precompiled header
-rewrite-legacy-objc Rewrite Legacy Objective-C source to C++
-rewrite-objc Rewrite Objective-C source to C++
--rocm-device-lib-path=<value>
ROCm device library path. Alternative to rocm-path.
--rocm-path=<value> ROCm installation path, used for finding and automatically linking required bitcode libraries.
-Rpass-analysis=<value> Report transformation analysis from optimization passes whose name matches the given POSIX regular expression
-Rpass-missed=<value> Report missed transformations by optimization passes whose name matches the given POSIX regular expression
-Rpass=<value> Report transformations performed by optimization passes whose name matches the given POSIX regular expression
-rtlib=<value> Compiler runtime library to use
-R<remark> Enable the specified remark
-save-stats=<value> Save llvm statistics.
-save-stats Save llvm statistics.
-save-temps=<value> Save intermediate compilation results.
-save-temps Save intermediate compilation results
-serialize-diagnostics <value>
Serialize compiler diagnostics to a file
-shared-libsan Dynamically link the sanitizer runtime
--start-no-unused-arguments
Don't emit warnings about unused arguments for the following arguments
-static-libsan Statically link the sanitizer runtime
-static-openmp Use the static host OpenMP runtime while linking.
-std=<value> Language standard to compile for
-stdlib++-isystem <directory>
Use directory as the C++ standard library include path
-stdlib=<value> C++ standard library to use
-sycl-std=<value> SYCL language standard to compile for.
--system-header-prefix=<prefix>
Treat all #include paths starting with <prefix> as including a system header.
-S Only run preprocess and compilation steps
--target=<value> Generate code for the given target
-time Time individual commands
-traditional-cpp Enable some traditional CPP emulation
-trigraphs Process trigraph sequences
-T <script> Specify <script> as linker script
-undef undef all system defines
-unwindlib=<value> Unwind library to use
-U <macro> Undefine macro <macro>
--verify-debug-info Verify the binary representation of debug output
-verify-pch Load and verify that a pre-compiled header file is not stale
--version Print version information
-v Show commands to run and use verbose output
-Wa,<arg> Pass the comma separated arguments in <arg> to the assembler
-Wdeprecated Enable warnings for deprecated constructs and define __DEPRECATED
-Wl,<arg> Pass the comma separated arguments in <arg> to the linker
-working-directory <value>
Resolve file paths relative to the specified directory
-Wp,<arg> Pass the comma separated arguments in <arg> to the preprocessor
-W<warning> Enable the specified warning
-w Suppress all warnings
-Xanalyzer <arg> Pass <arg> to the static analyzer
-Xarch_device <arg> Pass <arg> to the CUDA/HIP device compilation
-Xarch_host <arg> Pass <arg> to the CUDA/HIP host compilation
-Xassembler <arg> Pass <arg> to the assembler
-Xclang=<arg> Alias for -Xclang
-Xclang <arg> Pass <arg> to clang -cc1
-Xcuda-fatbinary <arg> Pass <arg> to fatbinary invocation
-Xcuda-ptxas <arg> Pass <arg> to the ptxas assembler
-Xlinker <arg> Pass <arg> to the linker
-Xoffload-linker<triple> <arg>
Pass <arg> to the offload linkers or the ones idenfied by -<triple>
-Xopenmp-target=<triple> <arg>
Pass <arg> to the target offloading toolchain identified by <triple>.
-Xopenmp-target <arg> Pass <arg> to the target offloading toolchain.
-Xpreprocessor <arg> Pass <arg> to the preprocessor
-x <language> Treat subsequent input files as having type <language>
-z <arg> Pass -z <arg> to the linker
Options (600)
| Option | Description | Source |
|---|---|---|
-### | Print (but do not run) the commands to run for this compilation | help |
--amdgpu-arch-tool value | Tool used for detecting AMD GPU arch in the system. | 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 |
-arcmt-migrate-emit-errors | Emit ARC errors even if the migrator can fix them | help |
-arcmt-migrate-report-output value | Output path for the plist report | help |
-B prefix | Search $prefix$file for executables, libraries, and data files. | help |
-b arg | Pass -b <arg> to the linker on AIX | help |
-cc1-args value | pass cc1 options to depscan afterwards | 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 |
--config file | Specify configuration file | 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 |
-dump-depscan-tree value | emit the CAS identifier for the tree instead of the full -cc1 | help |
-D macro>=<value | Define <macro> to <value> (or 1 if <value> omitted) | help |
-emit-ast | Emit Clang AST files for source inputs | 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 |
--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 |
-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 |
-fallow-editor-placeholders | Treat editor placeholders as valid source code | 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-cache-path directory | Does nothing; | 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 |
-fasync-exceptions | Enable EH Asynchronous exceptions | 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 |
-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 |
-fcf-protection | Enable cf-protection in 'full' mode | help |
-fchar8_t | Enable C++ builtin type char8_t | help |
-fclang-abi-compat version | Attempt to match the ABI of Clang <version> | 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 |
-fconvergent-functions | Assume functions may be convergent | help |
-fcoro-aligned-allocation | Prefer aligned allocation for C++ Coroutines | help |
-fcoroutines-ts | Enable support for the C++ Coroutines TS | 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-prefix-map value | remap file source paths in coverage mapping | help |
-fcrash-diagnostics-dir dir | Put crash-report files in <dir> | 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-approx-transcendentals | Use approximate transcendental functions | help |
-fcuda-short-ptr | Use 32-bit pointers for accessing const/local/shared address spaces | 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 value | remap file source paths in debug info | help |
-fdebug-ranges-base-address | Use DWARF base address selection entries in .debug_ranges | help |
-fdebug-types-section | Place debug types in their own section (ELF Only) | help |
-fdeclspec | Allow __declspec as a keyword | 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 |
-fdepscan-daemon value | Specify the path to the daemon to be used. | help |
-fdepscan-include-tree | Set dep-scanner to produce the include tree | help |
-fdepscan-prefix-map-sdk new | With -fdepscan, auto-detect the SDK path on-disk and remap it to the given path (see -fdepscan-prefix-map=). | help |
-fdepscan-prefix-map-toolchain new | With -fdepscan, auto-detect the toolchain path on-disk and remap it to the given path (see -fdepscan-prefix-map=). | help |
-fdepscan-prefix-map old>=<new | With -fdepscan, seamlessly filter the CAS filesystem to apply the given prefix, updating the command-line to match. | help |
-fdepscan-share-identifier value | Share depscan daemon for Clang invocations using the same string identifier. | help |
-fdepscan-share-parent value | Share state based on the PID of the parent command if the name matches. | help |
-fdepscan-share-stop value | Stop looking for the command named by -fdepscan-share if a process with the name of the provided argument is found first. | help |
-fdepscan value | Scan for dependencies ahead of compiling, generating a pruned CAS tree to send to -fcas-fs. | help |
-fdiagnostics-absolute-paths | Print absolute paths 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-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 |
-fdiscard-value-names | Discard value names in LLVM IR | help |
-fdollars-in-identifiers | Allow '$' in identifiers | help |
-fdouble-square-bracket-attributes | Enable '[[]]' attributes in all C and C++ language modes | 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-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 |
-fexperimental-library | Control whether unstable and experimental library features are enabled. | help |
-fexperimental-new-constant-interpreter | Enable the experimental new constant interpreter | help |
-fexperimental-relative-c++-abi-vtables | Use the experimental C++ class ABI for classes with virtual tables | help |
-fexperimental-sanitize-metadata value | Specify the type of metadata to emit for binary analysis sanitizers | help |
-fexperimental-strict-floating-point | Enables experimental strict floating point in LLVM. | help |
-fextend-arguments value | Controls how scalar integer arguments are extended in calls to unprototyped and varargs functions | help |
-ffast-math | Allow aggressive, lossy floating-point optimizations | 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, 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 loops are finite. | 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-point | Enable fixed point types | help |
-ffixed-r19 | Reserve register r19 (Hexagon only) | help |
-ffixed-r9 | Reserve the r9 register (ARM 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 (AArch64/RISC-V only) | help |
-ffixed-x17 | Reserve the x17 register (AArch64/RISC-V only) | help |
-ffixed-x18 | Reserve the x18 register (AArch64/RISC-V only) | help |
-ffixed-x19 | Reserve the x19 register (AArch64/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 (AArch64/RISC-V only) | help |
-ffixed-x2 | Reserve the x2 register (AArch64/RISC-V only) | help |
-ffixed-x30 | Reserve the x30 register (AArch64/RISC-V only) | help |
-ffixed-x31 | Reserve the x31 register (AArch64/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 (AArch64/RISC-V only) | help |
-ffixed-x9 | Reserve the x9 register (AArch64/RISC-V only) | 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): fast (fuses across statements disregarding pragmas) | on (only fuses in the same statement unless dictated by pragmas) | off (never fuses) | fast-honor-pragmas (fuses… | 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-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 AMDGPU target | 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 |
-fignore-exceptions | Enable support for ignoring exception handling constructs | help |
-fimplicit-module-maps | Implicitly search the file system for module map files. | 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-static-consts | Keep static const variables if unused | help |
-flax-vector-conversions value | Enable implicit vector bit-casts | 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 auto | Enable LTO in 'full' mode | 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 |
-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 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 | Minimize whitespace when emitting preprocessor 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 |
-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-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-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-ts | Enable support for the C++ Modules TS | 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-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-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 |
-fmsc-version value | Microsoft compiler version number to report in _MSC_VER (0 = don't define it (default)) | 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-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-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-coverage-mapping | Disable code coverage analysis | help |
-fno-crash-diagnostics | Disable auto-generation of preprocessed source files and a script for reproduction during a clang crash | help |
-fno-cuda-approx-transcendentals | Don't use approximate transcendental functions | help |
-fno-cxx-modules | Disable modules for C++ | help |
-fno-debug-macro | Do not emit macro debug information | help |
-fno-declspec | Disallow __declspec as a keyword | 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-depscan-share | Turn off -fdepscan-share and -fdepscan-share-parent. | help |
-fno-diagnostics-fixit-info | Do not include fixit information in diagnostics | help |
-fno-digraphs | Disallow alternative token representations '<:', ':>', '<%', '%>', '%:', '%:%:' | help |
-fno-direct-access-external-data | Use GOT indirection to reference external data symbols | help |
-fno-discard-value-names | Do not discard value names in LLVM IR | help |
-fno-dollars-in-identifiers | Disallow '$' in identifiers | help |
-fno-double-square-bracket-attributes | Disable '[[]]' attributes in all C and C++ language modes | 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-exceptions | Disable support for exception handling | 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-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-defer-diag | Don't defer host/device related diagnostic messages for CUDA/HIP | 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-knr-functions | Disable support for K&R C function declarations | 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-check-relocated value | Skip checks for relocated modules when loading PCM files | help |
-fno-modules-validate-textual-header-includes | Do not enforce -fmodules-decluse and private header restrictions for textual headers. | 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-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-openmp-extensions | Disable all Clang extensions for OpenMP directives and clauses | 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-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-ptrauth-abi-version | Disable Pointer Authentication ABI versioning | help |
-fno-ptrauth-kernel-abi-version | Disable Pointer Authentication kernel ABI versioning | 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-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-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-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-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-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-spell-checking | Disable spell-checking | help |
-fno-split-machine-functions | Disable late function splitting using profile information (x86 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-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-sycl | Disables SYCL kernels compilation for device | help |
-fno-temp-file | Directly create compilation output files. | help |
-fno-trigraphs | Do not process trigraph sequences | 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-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 |
-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-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-lto value | Set LTO mode for offload compilation | help |
-fopenmp-extensions | Enable all Clang extensions for OpenMP directives and clauses | 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-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, 50 for OpenMP 5.0). | help |
-fopenmp | Parse OpenMP pragmas and generate parallel code. | 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 |
-forder-file-instrumentation | Generate instrumented code to collect order file into default.profraw file (overridden by '=' form of option or LLVM_PROFILE_FILE env var) | help |
-fpack-struct value | Specify the default maximum struct packing alignment | help |
-fpascal-strings | Recognize and construct Pascal-style string literals | help |
-fpatchable-function-entry N | Generate M NOPs before function entry and N-M NOPs after function entry | help |
-fpcc-struct-return | Override the default ABI to return all structs on the stack | help |
-fpch-codegen | Generate code for uses of this PCH that assumes an explicit object file will be built for the PCH | help |
-fpch-debuginfo | Generate debug info for types in an object file built from this PCH and do not generate them elsewhere | help |
-fpch-instantiate-templates | Instantiate templates already while building a PCH | help |
-fpch-validate-input-files-content | Validate PCH input files based on content if mtime differs | help |
-fplugin-arg- name>-<arg | Pass <arg> to plugin <name> | help |
-fplugin dsopath | Load the named plugin (dynamic shared object) | help |
-fprebuilt-implicit-modules | Look up implicit modules in the prebuilt module path | help |
-fprebuilt-module-path directory | Specify the prebuilt module path | help |
-fproc-stat-report value | Save subprocess statistics to the given file | help |
-fprofile-exclude-files value | Instrument only functions from files where names don't match all the regexes separated by a semi-colon | help |
-fprofile-filter-files value | Instrument only functions from files where names match any regex separated by a semi-colon | help |
-fprofile-function-groups N | Partition functions into N groups and select only functions in group i to be instrumented using -fprofile-selected-function-group | help |
-fprofile-generate directory | Generate instrumented code to collect execution counts into <directory>/default.profraw (overridden by LLVM_PROFILE_FILE env var) | help |
-fprofile-instr-generate file | Generate instrumented code to collect execution counts into <file> (overridden by LLVM_PROFILE_FILE env var) | help |
-fprofile-instr-use value | Use instrumentation data for profile-guided optimization | help |
-fprofile-list value | Filename defining the list of functions/files to instrument | help |
-fprofile-remapping-file file | Use the remappings described in <file> to match the profile data against names in the program | help |
-fprofile-sample-accurate | Specifies that the sample profile is accurate | help |
-fprofile-sample-use value | Enable sample-based profile guided optimizations | help |
-fprofile-selected-function-group i | Partition functions into N groups using -fprofile-function-groups and select only functions in group i to be instrumented. | help |
-fprofile-update method | Set update method of profile counters | help |
-fprofile-use pathname | Use instrumentation data for profile-guided optimization. | help |
-fprotect-parens | Determines whether the optimizer honors parentheses when floating-point expressions are evaluated | help |
-fpseudo-probe-for-profiling | Emit pseudo probes for sample profiling | help |
-fptrauth-abi-version value | Pointer Authentication ABI version | help |
-fptrauth-auth-traps | Enable traps on authentication failures | help |
-fptrauth-calls | Enable signing and authentication of all indirect calls | help |
-fptrauth-indirect-gotos | Enable signing and authentication of indirect goto targets | help |
-fptrauth-intrinsics | Enable pointer-authentication intrinsics | help |
-fptrauth-kernel-abi-version | Enable Pointer Authentication kernel ABI version | help |
-fptrauth-returns | Enable signing and authentication of return addresses | help |
-fptrauth-soft | Enable software lowering of pointer authentication | help |
-frandomize-layout-seed-file file | File holding the seed used by the randomize structure layout feature | help |
-frandomize-layout-seed seed | The seed used by the randomize structure layout feature | help |
-freciprocal-math | Allow division operations to be reassociated | help |
-freg-struct-return | Override the default ABI to return small structs in registers | help |
-fregister-global-dtors-with-atexit | Use atexit or __cxa_atexit to register global destructors | help |
-frelaxed-template-template-args | Enable C++17 relaxed template template argument matching | help |
-freroll-loops | Turn on loop reroller | help |
-fropi | Generate read-only position independent code (ARM only) | help |
-frtlib-add-rpath | Add -rpath with architecture-specific resource directory to the linker flags | help |
-frwpi | Generate read-write position independent code (ARM only) | help |
-fsanitize-address-destructor value | Set destructor type used in ASan instrumentation | help |
-fsanitize-address-field-padding value | Level of field padding for AddressSanitizer | help |
-fsanitize-address-globals-dead-stripping | Enable linker dead stripping of globals in AddressSanitizer | help |
-fsanitize-address-outline-instrumentation | Always generate function calls for address sanitizer instrumentation | help |
-fsanitize-address-poison-custom-array-cookie | Enable poisoning array cookies when using custom operator new[] in AddressSanitizer | help |
-fsanitize-address-use-after-return mode | Select the mode of detecting stack use-after-return in AddressSanitizer | help |
-fsanitize-address-use-after-scope | Enable use-after-scope detection in AddressSanitizer | help |
-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 | help |
-fsanitize-blacklist value | Alias for -fsanitize-ignorelist= | help |
-fsanitize-cfi-canonical-jump-tables | Make the jump table addresses canonical in the symbol table | help |
-fsanitize-cfi-cross-dso | Enable control flow integrity (CFI) checks for cross-DSO calls. | help |
-fsanitize-cfi-icall-generalize-pointers | Generalize pointers in CFI indirect call type signature checks | help |
-fsanitize-coverage-allowlist value | Restrict sanitizer coverage instrumentation exclusively to modules and functions that match the provided special case list, except the blocked ones | help |
-fsanitize-coverage-ignorelist value | Disable sanitizer coverage instrumentation for modules and functions that match the provided special case list, even the allowed ones | help |
-fsanitize-coverage value | Specify the type of coverage instrumentation for Sanitizers | help |
-fsanitize-hwaddress-abi value | Select the HWAddressSanitizer ABI to target (interceptor or platform, default interceptor). | help |
-fsanitize-hwaddress-experimental-aliasing | Enable aliasing mode in HWAddressSanitizer | help |
-fsanitize-ignorelist value | Path to ignorelist file for sanitizers | help |
-fsanitize-memory-param-retval | Enable detection of uninitialized parameters and return values | help |
-fsanitize-memory-track-origins value | Enable origins tracking in MemorySanitizer | help |
-fsanitize-memory-use-after-dtor | Enable use-after-destroy detection in MemorySanitizer | help |
-fsanitize-memtag-mode value | Set default MTE mode to 'sync' (default) or 'async' | help |
-fsanitize-recover value | Enable recovery for specified sanitizers | help |
-fsanitize-stable-abi | Stable ABI instrumentation for sanitizer runtime. | help |
-fsanitize-stats | Enable sanitizer statistics gathering. | help |
-fsanitize-system-blacklist value | Alias for -fsanitize-system-ignorelist= | help |
-fsanitize-system-ignorelist value | Path to system ignorelist file for sanitizers | help |
-fsanitize-thread-atomics | Enable atomic operations instrumentation in ThreadSanitizer (default) | help |
-fsanitize-thread-func-entry-exit | Enable function entry/exit instrumentation in ThreadSanitizer (default) | help |
-fsanitize-thread-memory-access | Enable memory access instrumentation in ThreadSanitizer (default) | help |
-fsanitize-trap | Enable trapping for all sanitizers | help |
-fsanitize-undefined-strip-path-components number | Strip (or keep only, if negative) a given number of path components when emitting check metadata. | help |
-fsanitize check | Turn on runtime checks for various forms of undefined or suspicious behavior. | help |
-fsave-optimization-record format | Generate an optimization record file in a specific format | help |
-fseh-exceptions | Use SEH style exceptions | help |
-fshort-enums | Allocate to an enum type only as many bytes as it needs for the declared range of possible values | help |
-fshort-wchar | Force wchar_t to be a short unsigned int | help |
-fshow-overloads value | Which overload candidates to show when overload resolution fails. | help |
-fsigned-char | char is signed | help |
-fsized-deallocation | Enable C++14 sized global deallocation functions | help |
-fsjlj-exceptions | Use SjLj style exceptions | help |
-fslp-vectorize | Enable the superword-level parallelism vectorization passes | help |
-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 | help |
-fsplit-lto-unit | Enables splitting of the LTO unit | help |
-fsplit-machine-functions | Enable late function splitting using profile information (x86 ELF) | help |
-fsplit-stack | Use segmented stack | help |
-fstack-clash-protection | Enable stack clash protection | help |
-fstack-protector-all | Enable stack protectors for all functions | help |
-fstack-protector-strong | Enable stack protectors for some functions vulnerable to stack smashing. | help |
-fstack-protector | Enable stack protectors for some functions vulnerable to stack smashing. | help |
-fstack-size-section | Emit section containing metadata on function stack sizes | help |
-fstack-usage | Emit .su file containing information on function stack sizes | help |
-fstandalone-debug | Emit full debug info for all types used by the program | help |
-fstrict-enums | Enable optimizations based on the strict definition of an enum's value range | help |
-fstrict-flex-arrays n | Enable optimizations based on the strict definition of flexible arrays | help |
-fstrict-float-cast-overflow | Assume that overflowing float-to-int casts are undefined (default) | help |
-fstrict-vtable-pointers | Enable optimizations based on the strict rules for overwriting polymorphic C++ objects | help |
-fsuppress-conflicting-types | Ignore errors from conflicting types in function declarations | help |
-fswift-async-fp option | Control emission of Swift async extended frame info | help |
-fsycl | Enables SYCL kernels compilation for device | help |
-fsyntax-only | Run the preprocessor, parser and semantic analysis stages | help |
-fsystem-module | Build this module as a system module. | help |
-fthin-link-bitcode value | Write minimized bitcode to <file> for the ThinLTO thin link only | help |
-ftime-report value | (For new pass manager) 'per-pass': one report for each pass; | help |
-ftime-trace-granularity value | Minimum time granularity (in microseconds) traced by time profiler | help |
-ftime-trace value | Similar to -ftime-trace. | help |
-ftrapv-handler function | Specify the function to be called on overflow | help |
-ftrapv | Trap on integer overflow | help |
-ftrigraphs | Process trigraph sequences | help |
-ftrivial-auto-var-init-stop-after value | Stop initializing trivial automatic stack variables after the specified number of instances | help |
-ftrivial-auto-var-init value | Initialize trivial automatic stack variables. | help |
-funique-basic-block-section-names | Use unique names for basic block sections (ELF Only) | help |
-funique-internal-linkage-names | Uniqueify Internal Linkage Symbol Names by appending the MD5 hash of the module path | help |
-funroll-loops | Turn on loop unroller | help |
-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… | help |
-fuse-line-directives | Use #line in preprocessed output | help |
-fvalidate-ast-input-files-content | Compute and store the hash of input files used to build an AST. | help |
-fveclib value | Use the given vector functions library | help |
-fvectorize | Enable the loop vectorization passes | help |
-fverbose-asm | Generate verbose assembly output | help |
-fvirtual-function-elimination | Enables dead virtual function elimination optimization. | help |
-fvisibility-dllexport value | The visibility for dllexport definitions [-fvisibility-from-dllstorageclass] | help |
-fvisibility-externs-dllimport value | The visibility for dllimport external declarations [-fvisibility-from-dllstorageclass] | help |
-fvisibility-externs-nodllstorageclass value | The visibility for external declarations without an explicit DLL dllstorageclass [-fvisibility-from-dllstorageclass] | help |
-fvisibility-from-dllstorageclass | Set the visibility of symbols in the generated code from their DLL storage class | help |
-fvisibility-global-new-delete-hidden | Give global C++ operator new and delete declarations hidden visibility | help |
-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 | help |
-fvisibility-inlines-hidden | Give inline C++ member functions hidden visibility by default | help |
-fvisibility-ms-compat | Give global types 'default' visibility and global functions and variables 'hidden' visibility by default | help |
-fvisibility-nodllstorageclass value | The visibility for definitions without an explicit DLL export class [-fvisibility-from-dllstorageclass] | help |
-fvisibility value | Set the default symbol visibility for all global definitions | help |
-fwasm-exceptions | Use WebAssembly style exceptions | help |
-fwrapv | Treat signed integer overflow as two's complement | help |
-fwritable-strings | Store string literals as writable data | help |
-fxl-pragma-pack | Enable IBM XL #pragma pack handling | help |
-fxray-always-emit-customevents | Always emit __xray_customevent(...) calls even if the containing function is not always instrumented | help |
-fxray-always-emit-typedevents | Always emit __xray_typedevent(...) calls even if the containing function is not always instrumented | help |
-fxray-always-instrument value | DEPRECATED: Filename defining the whitelist for imbuing the 'always instrument' XRay attribute. | help |
-fxray-attr-list value | Filename defining the list of functions/types for imbuing XRay attributes. | help |
-fxray-function-groups value | Only instrument 1 of N groups | help |
-fxray-ignore-loops | Don't instrument functions with loops unless they also meet the minimum function size | help |
-fxray-instruction-threshold value | Sets the minimum function size to instrument with XRay | help |
-fxray-instrumentation-bundle value | Select which XRay instrumentation points to emit. | help |
-fxray-instrument | Generate XRay instrumentation sleds on function entry and exit | help |
-fxray-link-deps | Tells clang to add the link dependencies for XRay. | help |
-fxray-modes value | List of modes to link in by default into XRay instrumented binaries. | help |
-fxray-never-instrument value | DEPRECATED: Filename defining the whitelist for imbuing the 'never instrument' XRay attribute. | help |
-fxray-selected-function-group value | When using -fxray-function-groups, select which group of functions to instrument. | help |
-fzero-call-used-regs value | Clear call-used registers upon function return (AArch64/x86 only) | help |
-fzvector | Enable System z vector language extension | help |
-F value | Add directory to framework include search path | help |
--gcc-install-dir value | Use GCC installation in the specified directory. | help |
-gcodeview-ghash | Emit type record hashes in a .debug$H section | help |
-gcodeview | Generate CodeView debug information | help |
-gdwarf-2 | Generate source-level debug information with dwarf version 2 | help |
-gdwarf-3 | Generate source-level debug information with dwarf version 3 | help |
-gdwarf-4 | Generate source-level debug information with dwarf version 4 | help |
-gdwarf-5 | Generate source-level debug information with dwarf version 5 | help |
-gdwarf32 | Enables DWARF32 format for ELF binaries, if debug information emission is enabled. | help |
-gdwarf64 | Enables DWARF64 format for ELF binaries, if debug information emission is enabled. | help |
-gdwarf | Generate source-level debug information with the default dwarf version | help |
-gembed-source | Embed source text in DWARF debug sections | help |
-gline-directives-only | Emit debug line info directives only | help |
-gline-tables-only | Emit debug line number tables only | help |
-gmodules | Generate debug info with external references to clang modules or precompiled headers | help |
-gno-embed-source | Restore the default behavior of not embedding source text in DWARF debug sections | help |
--gpu-bundle-output | Bundle output files of HIP device compilation | help |
--gpu-instrument-lib value | Instrument device library for HIP, which is a LLVM bitcode containing __cyg_profile_func_enter and __cyg_profile_func_exit | help |
--gpu-max-threads-per-block value | Default max threads per block for kernel launch bounds for HIP | help |
-greproducible | Tune debug info to be reproducible. | help |
-gsplit-dwarf value | Set DWARF fission mode | help |
-gz value | DWARF debug sections compression type | help |