Experimental musl Port for FreeBSD

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Date: Sun, 26 Jul 2026 01:31:05 +0800
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To: [email protected]
From: ShengYi Hung <[email protected]>
Subject: Experimental musl Port for FreeBSD
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    <p>Hi all FreeBSD hackers,</p>
    <p>Since Claude reset my token quota last week and I couldn't use
      all of it, I decided to spend some time on an interesting side
      project: porting musl to FreeBSD.</p>
    <p>The repository is available here:<br>
      <a href=3D"https://github.com/aokblast/musl-freebsd"
        class=3D"moz-txt-link-freetext">https://github.com/aokblast/musl-=
freebsd</a></p>
    <p>At the moment it only supports x86_64, and about 96% of the musl
      libc test suite passes. This includes support for the thread
      library, TLS,=C2=A0getauxval, and dlopen.</p>
    <p>This is not intended for upstream. The implementation is fairly
      hacky, and musl upstream does not accept AI-generated code. It is
      simply an experimental side project, but I think it is still
      interesting to have a working musl port on FreeBSD for
      experimentation.</p>
    <p>To build musl, run:</p>
    <pre><code class=3D"language-sh">./configure \
    CC=3Dclang \
    AR=3Dllvm-ar \
    RANLIB=3Dllvm-ranlib \
    --target=3Dx86_64-portbld-freebsd16.0 \
    --prefix=3D{your install prefix} \
    --syslibdir=3D{your install prefix}/syslib
</code></pre>
    <p>For example, I use <code>/opt/musl</code> as the installation
      prefix.</p>
    <p>I also wrote a compiler wrapper that makes it easier to build
      programs against musl:<br>
      <a
href=3D"https://gist.github.com/aokblast/cd7d1f4339604e651492e8bf49e3d028=
"
        class=3D"moz-txt-link-freetext">https://gist.github.com/aokblast/=
cd7d1f4339604e651492e8bf49e3d028</a></p>
    <p>It currently uses musl's CRT together with the system-provided
      compiler-rt. Note that libpthread, libm, libdl, and several other
      C libraries are only stub libraries in musl and the real
      implementations are inside libc itself, so you do not need to pass
      additional linker flags for them.</p>
    <p>Feedback and testing are welcome.</p>
  </body>
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