<table border="1" cellspacing="0" cellpadding="8">

    <tr>

        <th>Issue</th>

        <td>

            <a href=https://github.com/llvm/llvm-project/issues/96382>96382</a>

        </td>

    </tr>

    <tr>

        <th>Summary</th>

        <td>

            Warnings on msvc headers when not in msvc environment

        </td>

    </tr>

    <tr>

      <th>Labels</th>

      <td>

            new issue

      </td>

    </tr>

    <tr>

      <th>Assignees</th>

      <td>

      </td>

    </tr>

    <tr>

      <th>Reporter</th>

      <td>

          trcrsired

      </td>

    </tr>

</table>

<pre>

https://github.com/trcrsired/windows-msvc-cross-runtimes/tree/main

```cpp

D:\msys64\home\unlvs\projects\fast_io\examples\0001.helloworld>clang++ -o helloworld.exe helloworld.cc -Ofast -std=c++26 --target=x86_64-windows-msvc -I../../include -flto=thin -ID:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include -LD:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\lib\x86_64-windows-msvc -fuse-ld=lld -D_DLL=1 -lmsvcrt -Wall -Wextra

In file included from helloworld.cc:1:

In file included from ../../include/fast_io.h:9:

In file included from ../../include/fast_io_hosted.h:18:

In file included from ../../include/fast_io_freestanding.h:12:

In file included from ../../include/fast_io_core.h:17:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/bit:14:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/__msvc_bit_utils.hpp:14:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/intrin.h:35:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/immintrin.h:30:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/wmmintrin.h:31:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/nmmintrin.h:32:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/smmintrin.h:32:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/tmmintrin.h:25:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/pmmintrin.h:34:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/emmintrin.h:38:

In file included from D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/xmmintrin.h:46:

D:\msys64\home\unlvs\projects\windows-msvc-cross-runtimes\include/mmintrin.h:34:26: warning: __declspec attribute 'intrin_type' is not supported [-Wignored-attributes]

   34 | typedef union __declspec(intrin_type) __declspec(align(8)) __m64

      | ^~~~~~~~~~~