diff options
Diffstat (limited to 'cmake/Modules/CompilerRTCompile.cmake')
-rw-r--r-- | cmake/Modules/CompilerRTCompile.cmake | 38 |
1 files changed, 30 insertions, 8 deletions
diff --git a/cmake/Modules/CompilerRTCompile.cmake b/cmake/Modules/CompilerRTCompile.cmake index de73ccfc5cb8..b2e62dd0bac6 100644 --- a/cmake/Modules/CompilerRTCompile.cmake +++ b/cmake/Modules/CompilerRTCompile.cmake @@ -1,4 +1,28 @@ -include(LLVMParseArguments) +# On Windows, CMAKE_*_FLAGS are built for MSVC but we use the GCC clang.exe, +# which uses completely different flags. Translate some common flag types, and +# drop the rest. +function(translate_msvc_cflags out_flags msvc_flags) + # Insert an empty string in the list to simplify processing. + set(msvc_flags ";${msvc_flags}") + + # Canonicalize /flag to -flag. + string(REPLACE ";/" ";-" msvc_flags "${msvc_flags}") + + # Make space separated -D and -U flags into joined flags. + string(REGEX REPLACE ";-\([DU]\);" ";-\\1" msvc_flags "${msvc_flags}") + + set(clang_flags "") + foreach(flag ${msvc_flags}) + if ("${flag}" MATCHES "^-[DU]") + # Pass through basic command line macro definitions (-DNDEBUG). + list(APPEND clang_flags "${flag}") + elseif ("${flag}" MATCHES "^-O[2x]") + # Canonicalize normal optimization flags to -O2. + list(APPEND clang_flags "-O2") + endif() + endforeach() + set(${out_flags} "${clang_flags}" PARENT_SCOPE) +endfunction() # Compile a source into an object file with COMPILER_RT_TEST_COMPILER using # a provided compile flags and dependenices. @@ -6,7 +30,7 @@ include(LLVMParseArguments) # CFLAGS <list of compile flags> # DEPS <list of dependencies>) macro(clang_compile object_file source) - parse_arguments(SOURCE "CFLAGS;DEPS" "" ${ARGN}) + cmake_parse_arguments(SOURCE "" "" "CFLAGS;DEPS" ${ARGN}) get_filename_component(source_rpath ${source} REALPATH) if(NOT COMPILER_RT_STANDALONE_BUILD) list(APPEND SOURCE_DEPS clang compiler-rt-headers) @@ -20,13 +44,11 @@ macro(clang_compile object_file source) else() string(REPLACE " " ";" global_flags "${CMAKE_C_FLAGS}") endif() - # On Windows, CMAKE_*_FLAGS are built for MSVC but we use the GCC clang.exe - # which doesn't support flags starting with "/smth". Replace those with - # "-smth" equivalents. - if(MSVC) - string(REGEX REPLACE "^/" "-" global_flags "${global_flags}") - string(REPLACE ";/" ";-" global_flags "${global_flags}") + + if (MSVC) + translate_msvc_cflags(global_flags "${global_flags}") endif() + # Ignore unknown warnings. CMAKE_CXX_FLAGS may contain GCC-specific options # which are not supported by Clang. list(APPEND global_flags -Wno-unknown-warning-option) |