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Always use -Wl,-gc-sections on our build.

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Both bfd ld and gold correctly handle --export-dynamic, so gc-sections is safe even for binaries
that support plugins.

llvm-svn: 220174
This commit is contained in:
Rafael Espindola 2014-10-19 23:24:46 +00:00
parent 6956c38e1a
commit 965c115842
1 changed files with 9 additions and 6 deletions
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15
cmake/modules/AddLLVM.cmake
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@ -141,15 +141,18 @@ function(add_llvm_symbol_exports target_name export_file)
endfunction(add_llvm_symbol_exports)
function(add_dead_strip target_name)
if(NOT LLVM_NO_DEAD_STRIP)
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
# ld64's implementation of -dead_strip breaks tools that use plugins.
if(NOT LLVM_NO_DEAD_STRIP)
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,-dead_strip")
elseif(NOT WIN32)
# Object files are compiled with -ffunction-data-sections.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
endif()
elseif(NOT WIN32)
# Object files are compiled with -ffunction-data-sections.
# On ELF --gc-sections handles --export-dynamic correctly, so we can always
# use it.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
endif()
endfunction(add_dead_strip)