Windows x86-64 Clang compiler fails to compile because of lacking -mavx2

I'm compileing flac on Windows x86-64 with Clang version 17.0.1 and targeting at x86_64-pc-windows-msvc with Visual Studio 2022 installed. This is the command I used to configure:

cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Release -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++ -DWITH_OGG=OFF -DBUILD_EXAMPLES=OFF -DBUILD_TESTING=OFF -DBUILD_DOCS=OFF -DINSTALL_MANPAGES=OFF -DINSTALL_PKGCONFIG_MODULES=OFF -DCMAKE_INSTALL_PREFIX="D:\flac"

and I got the error

C:/Users/Administrator/Downloads/Compressed/flac-master/src/libFLAC/stream_encoder_intrin_avx2.c:65:5: error: use of undeclared identifier '__m256i'
   65 |                                 __m256i sum256 = _mm256_setzero_si256();
      |                                 ^
C:/Users/Administrator/Downloads/Compressed/flac-master/src/libFLAC/stream_encoder_intrin_avx2.c:70:6: error: use of undeclared identifier '__m256i'
   70 |                                         __m256i res256 = _mm256_abs_epi32(_mm256_loadu_si256((const __m256i*)(const void*)(residual+residual_sample)));
      |

It seems you need to add compile flag -mavx2 to the compiler, where I add the -DCMAKE_CXX_FLAGS="-mavx2" -DCMAKE_C_FLAGS="-mavx2" to the command and everthing works well.

Start with src/libFLAC/stream_encoder_intrin_avx2.c around the reported __m256i errors, then inspect the CMake configuration used for Windows x86-64 builds. Reproduce the Ninja/Clang configuration without manually adding -mavx2, and verify that the build succeeds with the project’s normal configuration.