Windows/Clang: Support PDB when cross-compiling

Modules/Platform/Windows-Clang.cmake

@@ -101,6 +101,7 @@ macro(__windows_compiler_clang_gnu lang)
     string(APPEND CMAKE_${lang}_FLAGS_RELWITHDEBINFO_INIT " -O2 -g -DNDEBUG -Xclang -gcodeview ${__ADDED_FLAGS}")
   endif()
   set(CMAKE_INCLUDE_SYSTEM_FLAG_${lang} "-isystem ")
+  set(CMAKE_${lang}_LINKER_SUPPORTS_PDB ON)
 
   set(CMAKE_PCH_EXTENSION .pch)
   set(CMAKE_PCH_PROLOGUE "#pragma clang system_header")

Tests/RunCMake/CMakeLists.txt

@@ -84,7 +84,8 @@ endif()
 
 # Test MSVC for older host CMake versions, and test
 # WIN32/CMAKE_C_COMPILER_ID to fix check on Intel for Windows.
-if(MSVC OR (WIN32 AND CMAKE_C_COMPILER_ID MATCHES "MSVC|Intel"))
+if(MSVC OR (WIN32 AND CMAKE_C_COMPILER_ID MATCHES "MSVC|Intel")
+   OR (WIN32 AND CMAKE_C_COMPILER_ID MATCHES "Clang" AND CMAKE_C_SIMULATE_ID MATCHES "MSVC"))
   set(LINKER_SUPPORTS_PDB 1)
 else()
   set(LINKER_SUPPORTS_PDB 0)