Merge pull request #85421 from compnerd/driver

build: use the correct driver for building the unit tests

Author: compnerd

unittests/runtime/CMakeLists.txt

@@ -8,8 +8,13 @@ if(("${SWIFT_HOST_VARIANT_SDK}" STREQUAL "${SWIFT_PRIMARY_VARIANT_SDK}") AND
 
   if("${CMAKE_C_COMPILER_ID}" MATCHES "Clang")
     if(NOT SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER)
-      set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang++")
-      set(CMAKE_C_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang")
+      if(SWIFT_COMPILER_IS_MSVC_LIKE)
+        set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang-cl")
+        set(CMAKE_C_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang-cl")
+      else()
+        set(CMAKE_CXX_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang++")
+        set(CMAKE_C_COMPILER "${SWIFT_NATIVE_CLANG_TOOLS_PATH}/clang")
+      endif()
     endif()
   elseif(SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER)
     message(FATAL_ERROR "Building the swift runtime is not supported with ${CMAKE_C_COMPILER_ID}. Use the just-built clang instead.")