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Don't use -ffunction-sections if -fno-function-sections is not supported in the compiler.

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This will disable -ffunction-sections in older versions of Clang where it
breaks build of sanitizer runtime library.

llvm-svn: 200695
This commit is contained in:
Evgeniy Stepanov 2014-02-03 13:57:09 +00:00
parent 1853ef8924
commit 168096d3f9
1 changed files with 11 additions and 1 deletions
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12
cmake/modules/HandleLLVMOptions.cmake
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@ -350,13 +350,23 @@ if (UNIX AND
append("-fcolor-diagnostics" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
# Clang prior to 3.5 ignored -fno-function-sections.
# It's pretty hard to test directly, so we rely on the version number.
if( ("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5) )
set(LLVM_COMPILER_HAS_BROKEN_FNO_FUNCTION_SECTIONS ON)
endif()
# Add flags for add_dead_strip().
# FIXME: With MSVS, consider compiling with /Gy and linking with /OPT:REF?
# But MinSizeRel seems to add that automatically, so maybe disable these
# flags instead if LLVM_NO_DEAD_STRIP is set.
if(NOT CYGWIN AND NOT WIN32)
if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
append("-ffunction-sections -fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
# Don't add -ffunction-section if it can be disabled with -fno-function-sections.
# Doing so will break sanitizers.
if (NOT LLVM_COMPILER_HAS_BROKEN_FNO_FUNCTION_SECTIONS)
append("-ffunction-sections -fdata-sections" CMAKE_C_FLAGS CMAKE_CXX_FLAGS)
endif()
endif()
endif()