[compiler-rt] r232219 - Translate some MSVC CMAKE_*_FLAGS to clang flags in clang_compile
Reid Kleckner
reid at kleckner.net
Fri Mar 13 14:39:29 PDT 2015
Author: rnk
Date: Fri Mar 13 16:39:29 2015
New Revision: 232219
URL: http://llvm.org/viewvc/llvm-project?rev=232219&view=rev
Log:
Translate some MSVC CMAKE_*_FLAGS to clang flags in clang_compile
Passing MSVC-style cflags to the gcc-style clang driver will almost
always end badly. Just translate a couple of simple flags used by the
base CMake cflags like /D, /U, and /O.
Modified:
compiler-rt/trunk/cmake/Modules/CompilerRTCompile.cmake
Modified: compiler-rt/trunk/cmake/Modules/CompilerRTCompile.cmake
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/cmake/Modules/CompilerRTCompile.cmake?rev=232219&r1=232218&r2=232219&view=diff
==============================================================================
--- compiler-rt/trunk/cmake/Modules/CompilerRTCompile.cmake (original)
+++ compiler-rt/trunk/cmake/Modules/CompilerRTCompile.cmake Fri Mar 13 16:39:29 2015
@@ -1,5 +1,31 @@
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.
# clang_compile(<object> <source>
@@ -20,13 +46,11 @@ 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)
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