<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/123880>123880</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Build libcxx with winpthreads+
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          void2012
      </td>
    </tr>
</table>

<pre>
    Hi! I want to build my custom build of libc++ using the command line with clang-cl:

`cmake -G "Visual Studio 17 2022" -S runtimes -B build ^
-T "LLVM_v141_xp" ^
-DLLVM_ENABLE_RUNTIMES=libcxx ^
-DLIBCXX_ENABLE_SHARED=YES ^
-DLIBCXX_ENABLE_STATIC=YES ^
-DLIBCXX_ENABLE_FILESYSTEM=NO ^
-DLIBCXX_INCLUDE_TESTS=NO ^
-DLIBCXX_HAS_PTHREAD_API=YES ^
-DCMAKE_CXX_FLAGS="/D_WIN32_WINNT=0x0501 /DWINVER=0x0501" ^
-DCMAKE_GENERATOR_PLATFORM=Win32`

However, during the build the compiler can't find `pthread.h` and `sched.h`, which is not surprising. But how do I specify the path for the winpthreads library to depend on? Thanks!
</pre>
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