ExtUtils::Mkbootstrap(3pm) Perl Programmers Reference Guide ExtUtils::Mkbootstrap(3pm)

# [NAME](#NAME)

ExtUtils::Mkbootstrap - make a bootstrap file for use by DynaLoader

# [SYNOPSIS](#SYNOPSIS)

```
  Mkbootstrap
```

# [DESCRIPTION](#DESCRIPTION)

Mkbootstrap typically gets called from an extension Makefile.

There is no "\*.bs" file supplied with the extension. Instead, there may be a \*\_BS file which has code for the special cases, like posix for berkeley db on the NeXT.

This file will get parsed, and produce a maybe empty @DynaLoader::dl\_resolve\_using array for the current architecture. That will be extended by $BSLOADLIBS, which was computed by **ExtUtils::Liblist::ext()**. If this array still is empty, we do nothing, else we write a .bs file with an @DynaLoader::dl\_resolve\_using array.

The \*\_BS file can put some code into the generated "\*.bs" file by placing it in $bscode. This is a handy 'escape' mechanism that may prove useful in complex situations.

If @DynaLoader::dl\_resolve\_using contains "-L\*" or "-l\*" entries then Mkbootstrap will automatically add a **dl\_findfile()** call to the generated "\*.bs" file.

2026-10-27 perl v5.44.0

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Document: ExtUtils::Mkbootstrap(3pm) from perl 5.44.0-r4 (Chainguard OS)
Source: https://github.com/Perl/perl5.git