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[CMake] Revert r200695 and fix the problem with missing -fno-function-sections in a different way.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200745 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alexey Samsonov 2014-02-04 08:15:46 +00:00
parent caeb7f94c7
commit c55ee815d4
1 changed files with 12 additions and 10 deletions
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18
cmake/modules/HandleLLVMOptions.cmake
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@ -335,23 +335,25 @@ 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")
check_c_compiler_flag("-Werror -fno-function-sections" C_SUPPORTS_FNO_FUNCTION_SECTIONS)
if (C_SUPPORTS_FNO_FUNCTION_SECTIONS)
# 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)
check_c_compiler_flag("-Werror -ffunction-sections" C_SUPPORTS_FFUNCTION_SECTIONS)
check_cxx_compiler_flag("-Werror -ffunction-sections" CXX_SUPPORTS_FFUNCTION_SECTIONS)
append_if(C_SUPPORTS_FFUNCTION_SECTIONS "-ffunction-sections" CMAKE_C_FLAGS)
append_if(CXX_SUPPORTS_FFUNCTION_SECTIONS "-ffunction-sections" CMAKE_CXX_FLAGS)
endif()
check_c_compiler_flag("-Werror -fdata-sections" C_SUPPORTS_FDATA_SECTIONS)
check_cxx_compiler_flag("-Werror -fdata-sections" CXX_SUPPORTS_FDATA_SECTIONS)
append_if(C_SUPPORTS_FDATA_SECTIONS "-fdata-sections" CMAKE_C_FLAGS)
append_if(CXX_SUPPORTS_FDATA_SECTIONS "-fdata-sections" CMAKE_CXX_FLAGS)
endif()
endif()