<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/101477>101477</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Windows package should provide runtime libraries for windows-gnu
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

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

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

<pre>
    Hello,

I would like to use Clang with a mingw-based sysroot. The issue is that the official Windows installer only ships with the MSVC runtimes.
Setting the target to mingw, clang will search for `libclang_rt.builtins-x86_64.a` instead of the existing `clang_rt.builtins-x86_64.lib`.
Resulting Error:

```
C:\PROGRA~1\LLVM\bin\clang.exe --target=x86_64-w64-mingw32 --sysroot="C:/Program Files/Llvm-Mingw/x86_64-w64-mingw32"  --start-no-unused-arguments -stdlib=libc++ -rtlib=compiler-rt -unwindlib=libunwind --end-no-unused-arguments    -fuse-ld=lld CMakeFiles/cmTC_0d61d.dir/testCCompiler.c.obj -o cmTC_0d61d.exe -Wl,--out-implib,libcmTC_0d61d.dll.a -Wl,--major-image-version,0,--minor-image-version,0  -lkernel32 -luser32 -lgdi32 -lwinspool -lshell32 -lole32 -loleaut32 -luuid -lcomdlg32 -ladvapi32 && cd ."
[cmake]     ld.lld: error: could not open 'C:\Program Files\LLVM\lib\clang\18\lib\windows\libclang_rt.builtins-x86_64.a': no such file or directory
```

My request would be to build and add those runtimes (the builtins atleast, sanitizers and others would likely depend too much on the C/C++ library) to the Windows installer.
</pre>
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