[CMake] Enhance llvm_update_compile_flags(name sources) to handle LLVM_REQUIRES_EH and LLVM_REQUIRES_RTTI.

LLVM_REQUIRES_EH implies LLVM_REQUIRES_RTTI. It is as same behavior as Makefile.rule's.
llvm/examples/ExceptionDemo is affected. (It was built with -fno-rtti.)

For MSVC, Remove flags like "/EHsc /GR" in HandleLLVMOptions, or CL.EXE complains with flags like "/GR /GR-".

llvm_update_compile_flags() updates source file property if the target contains *.c.
COMPILE_FLAGS in target properties affects both C++ and C!

LLVM_NO_RTTI is deprecated. It was introduced by me and was my mistake.

llvm-svn: 200301

cmake/modules/AddLLVM.cmake

@@ -3,20 +3,45 @@ include(LLVMProcessSources)
 include(LLVM-Config)
 
 function(llvm_update_compile_flags name)
-  get_property(target_compile_flags TARGET ${name} PROPERTY COMPILE_FLAGS)
-  if(NOT "${LLVM_COMPILE_FLAGS}" STREQUAL "")
-    set(target_compile_flags "${target_compile_flags} ${LLVM_COMPILE_FLAGS}")
+  set(ALL_SOURCES ${ARGN})
+  if("${ALL_SOURCES}" MATCHES "\\.c(;|$)")
+    set(update_src_props ON)
   endif()
-  if(LLVM_NO_RTTI)
+
+  if(LLVM_REQUIRES_EH)
+    set(LLVM_REQUIRES_RTTI ON)
+  else()
+    if(LLVM_COMPILER_IS_GCC_COMPATIBLE)
+      set(target_compile_flags "${target_compile_flags} -fno-exceptions")
+    elseif(MSVC)
+      list(APPEND LLVM_COMPILE_DEFINITIONS _HAS_EXCEPTIONS=0)
+      set(target_compile_flags "${target_compile_flags} /EHs-c-")
+    endif()
+  endif()
+
+  if(NOT LLVM_REQUIRES_RTTI)
     list(APPEND LLVM_COMPILE_DEFINITIONS GTEST_HAS_RTTI=0)
     if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
       set(target_compile_flags "${target_compile_flags} -fno-rtti")
     elseif (MSVC)
-      llvm_replace_compiler_option(target_compile_flags "/GR" "/GR-")
+      set(target_compile_flags "${target_compile_flags} /GR-")
     endif ()
   endif()
 
-  set_property(TARGET ${name} PROPERTY COMPILE_FLAGS "${target_compile_flags}")
+  if(update_src_props)
+    foreach(fn ${ALL_SOURCES})
+      get_filename_component(suf ${fn} EXT)
+      if("${suf}" STREQUAL ".cpp")
+	set_property(SOURCE ${fn} APPEND_STRING PROPERTY
+	  COMPILE_FLAGS "${target_compile_flags}")
+      endif()
+    endforeach()
+  else()
+    # Update target props, since all sources are C++.
+    set_property(TARGET ${name} APPEND_STRING PROPERTY
+      COMPILE_FLAGS "${target_compile_flags}")
+  endif()
+
   set_property(TARGET ${name} APPEND PROPERTY COMPILE_DEFINITIONS ${LLVM_COMPILE_DEFINITIONS})
 endfunction()
 
@@ -137,6 +162,7 @@ macro(add_llvm_library name)
   add_library( ${name} ${ALL_FILES} )
   set_output_directory(${name} ${LLVM_RUNTIME_OUTPUT_INTDIR} ${LLVM_LIBRARY_OUTPUT_INTDIR})
   set_property( GLOBAL APPEND PROPERTY LLVM_LIBS ${name} )
+  llvm_update_compile_flags(${name} ${ALL_FILES})
   add_dead_strip( ${name} )
   if( LLVM_COMMON_DEPENDS )
     add_dependencies( ${name} ${LLVM_COMMON_DEPENDS} )
@@ -196,6 +222,7 @@ ${name} ignored.")
     add_library( ${name} ${libkind} ${ALL_FILES} )
     set_output_directory(${name} ${LLVM_RUNTIME_OUTPUT_INTDIR} ${LLVM_LIBRARY_OUTPUT_INTDIR})
     set_target_properties( ${name} PROPERTIES PREFIX "" )
+    llvm_update_compile_flags(${name} ${ALL_FILES})
     add_dead_strip( ${name} )
 
     if (LLVM_EXPORTED_SYMBOL_FILE)
@@ -237,6 +264,7 @@ macro(add_llvm_executable name)
   else()
     add_executable(${name} ${ALL_FILES})
   endif()
+  llvm_update_compile_flags(${name} ${ALL_FILES})
   add_dead_strip( ${name} )
 
   if (LLVM_EXPORTED_SYMBOL_FILE)
@@ -374,7 +402,7 @@ function(add_unittest test_suite test_name)
     set(LLVM_COMPILE_FLAGS "-Wno-variadic-macros")
   endif ()
 
-  set(LLVM_NO_RTTI ON)
+  set(LLVM_REQUIRES_RTTI OFF)
 
   add_llvm_executable(${test_name} ${ARGN})
   set(outdir ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR})
@@ -390,7 +418,6 @@ function(add_unittest test_suite test_name)
   if (NOT ${test_suite_folder} STREQUAL "NOTFOUND")
     set_property(TARGET ${test_name} PROPERTY FOLDER "${test_suite_folder}")
   endif ()
-  llvm_update_compile_flags(${test_name})
 endfunction()
 
 # This function provides an automatic way to 'configure'-like generate a file

cmake/modules/HandleLLVMOptions.cmake

@@ -359,3 +359,11 @@ if(NOT CYGWIN AND NOT WIN32)
     append("-ffunction-sections -fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
   endif()
 endif()
+
+if(MSVC)
+  # Remove flags here, for exceptions and RTTI.
+  # Each target property of source proerty should be responsible to control them.
+  # CL.EXE complains to override flags like "/GR /GR-".
+  string(REGEX REPLACE "(^| ) */EH[-cs]+ *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+  string(REGEX REPLACE "(^| ) */GR-? *( |$)" "\\1 \\2" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
+endif()