[CMake] [WinMsvc] Look for includes and libs in ${MSVC_BASE}/atlmfc

[mstorsjo]

Summary

This is necessary if building with the DIA SDK enabled.

This doesn't seem to add any warnings in case the atlmfc directory doesn't exist, so hopefully it should be safe to just add it like this.

[smeenai]

LGTM. I'll trust that you're matching the order used by VSDevCmd :)

[mstorsjo]

In D69240#1717204, @smeenai wrote:

LGTM. I'll trust that you're matching the order used by VSDevCmd :)

Good point, I'll check that, and adjust if necessary, before committing :-)

llvm/cmake/platforms/WinMsvc.cmake

 elseif(HOST_ARCH STREQUAL "x86_64" OR HOST_ARCH STREQUAL "x64")
   set(TRIPLE_ARCH "x86_64")
   set(WINSDK_ARCH "x64")
 else()
   message(SEND_ERROR "Unknown host architecture ${HOST_ARCH}. Must be aarch64 (or arm64), armv7 (or arm), i686 (or x86), or x86_64 (or x64).")
 endif()
 
 set(MSVC_INCLUDE "${MSVC_BASE}/include")
+set(ATLMFC_INCLUDE "${MSVC_BASE}/atlmfc/include")
 set(MSVC_LIB "${MSVC_BASE}/lib")
+set(ATLMFC_LIB "${MSVC_BASE}/atlmfc/lib")
 set(WINSDK_INCLUDE "${WINSDK_BASE}/Include/${WINSDK_VER}")
 set(WINSDK_LIB "${WINSDK_BASE}/Lib/${WINSDK_VER}")
 
 # Do some sanity checking to make sure we can find a native toolchain and
 # that the Windows SDK / MSVC STL directories look kosher.
 if(NOT EXISTS "${LLVM_NATIVE_TOOLCHAIN}/bin/clang-cl" OR
    NOT EXISTS "${LLVM_NATIVE_TOOLCHAIN}/bin/lld-link")
   message(SEND_ERROR

 
 set(CROSS_TOOLCHAIN_FLAGS_NATIVE "${_CTF_NATIVE_DEFAULT}" CACHE STRING "")
 
 set(COMPILE_FLAGS
     -D_CRT_SECURE_NO_WARNINGS
     --target=${TRIPLE_ARCH}-windows-msvc
     -fms-compatibility-version=19.11
     -imsvc "${MSVC_INCLUDE}"
+    -imsvc "${ATLMFC_INCLUDE}"
     -imsvc "${WINSDK_INCLUDE}/ucrt"
     -imsvc "${WINSDK_INCLUDE}/shared"
     -imsvc "${WINSDK_INCLUDE}/um"
     -imsvc "${WINSDK_INCLUDE}/winrt")
 
 if(case_sensitive_filesystem)
   # Ensure all sub-configures use the top-level VFS overlay instead of generating their own.
   init_user_prop(winsdk_vfs_overlay_path)

 set(_CMAKE_CXX_FLAGS_INITIAL "${CMAKE_CXX_FLAGS}" CACHE STRING "")
 set(CMAKE_CXX_FLAGS "${_CMAKE_CXX_FLAGS_INITIAL} ${COMPILE_FLAGS}" CACHE STRING "" FORCE)
 
 set(LINK_FLAGS
     # Prevent CMake from attempting to invoke mt.exe. It only recognizes the slashed form and not the dashed form.
     /manifest:no
 
     -libpath:"${MSVC_LIB}/${WINSDK_ARCH}"
+    -libpath:"${ATLMFC_LIB}/${WINSDK_ARCH}"
     -libpath:"${WINSDK_LIB}/ucrt/${WINSDK_ARCH}"
     -libpath:"${WINSDK_LIB}/um/${WINSDK_ARCH}")
 
 if(case_sensitive_filesystem)
   # Ensure all sub-configures use the top-level symlinks dir instead of generating their own.
   init_user_prop(winsdk_lib_symlinks_dir)
   if(NOT winsdk_lib_symlinks_dir)
     set(winsdk_lib_symlinks_dir "${CMAKE_BINARY_DIR}/winsdk_lib_symlinks")