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Explain why we don't always use --gc-sections.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220237 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-10-20 21:37:38 +00:00
parent 4e399f4500
commit b9c7f60191
1 changed files with 4 additions and 0 deletions
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4
cmake/modules/AddLLVM.cmake
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@ -143,10 +143,14 @@ endfunction(add_llvm_symbol_exports)
function(add_dead_strip target_name)
if(NOT LLVM_NO_DEAD_STRIP)
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
# ld64's implementation of -dead_strip breaks tools that use plugins.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,-dead_strip")
elseif(NOT WIN32)
# Object files are compiled with -ffunction-data-sections.
# Versions of bfd ld < 2.23.1 have a bug in --gc-sections that breaks
# tools that use plugins. Always pass --gc-sections once we require
# a newer linker.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
endif()