specify compilation flags for LLVMSupport

Signed-off-by: Zhu, Shaojie <[email protected]>

Author: ShaojieZhuIntel

llvm/cmake/modules/HandleLLVMOptions.cmake

@@ -767,15 +767,6 @@ if (MSVC)
   foreach(flag ${msvc_warning_flags})
     append("${flag}" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   endforeach(flag)
-
-  if (BUILD_COMPILER_FOR_DRIVER)
-    string(REPLACE "-wd4146" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
-    string(REPLACE "-wd4146" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-    string(REPLACE "-wd4244" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
-    string(REPLACE "-wd4244" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-    string(REPLACE "-wd4267" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
-    string(REPLACE "-wd4267" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
-  endif (BUILD_COMPILER_FOR_DRIVER)
 endif (MSVC)
 
 if (LLVM_ENABLE_WARNINGS AND (LLVM_COMPILER_IS_GCC_COMPATIBLE OR CLANG_CL))

llvm/lib/Support/CMakeLists.txt

@@ -292,6 +292,18 @@ add_llvm_component_library(LLVMSupport
   Demangle
   )
 
+if(BUILD_COMPILER_FOR_DRIVER)
+  get_target_property(CURRENT_COMPILE_OPTIONS LLVMSupport COMPILE_OPTIONS)
+  message(STATUS "Current compile options: ${CURRENT_COMPILE_OPTIONS}")
+  string(REPLACE "/wd4146" "" NEW_COMPILE_OPTIONS "${CURRENT_COMPILE_OPTIONS}")
+  string(REPLACE "/wd4244" "" NEW_COMPILE_OPTIONS "${NEW_COMPILE_OPTIONS}")
+  string(REPLACE "/wd4267" "" NEW_COMPILE_OPTIONS "${NEW_COMPILE_OPTIONS}")
+  string(REPLACE ";;" ";" NEW_COMPILE_OPTIONS "${NEW_COMPILE_OPTIONS}")
+  set_target_properties(LLVMSupport PROPERTIES COMPILE_OPTIONS "${NEW_COMPILE_OPTIONS}")
+  get_target_property(NEW_COMPILE_OPTIONS LLVMSupport COMPILE_OPTIONS)
+  message(STATUS "New compile options: ${NEW_COMPILE_OPTIONS}")
+endif()
+
 set(llvm_system_libs ${system_libs})
 
 # This block is only needed for llvm-config. When we deprecate llvm-config and