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Detect if the linker is gold and if so always use --gc-sections.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223372 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-12-04 17:54:35 +00:00
parent efbb95a1be
commit 89f1920565
1 changed files with 15 additions and 1 deletions
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16
cmake/modules/AddLLVM.cmake
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@ -142,6 +142,14 @@ function(add_llvm_symbol_exports target_name export_file)
set(LLVM_COMMON_DEPENDS ${LLVM_COMMON_DEPENDS} PARENT_SCOPE)
endfunction(add_llvm_symbol_exports)
if(NOT WIN32 AND NOT APPLE)
execute_process(COMMAND ${CMAKE_C_COMPILER} -Wl,--version
OUTPUT_VARIABLE stdout)
if("${stdout}" MATCHES "GNU gold")
set(LLVM_LINKER_IS_GOLD ON)
endif()
endif()
function(add_link_opts target_name)
# Pass -O3 to the linker. This enabled different optimizations on different
# linkers.
@ -150,12 +158,18 @@ function(add_link_opts target_name)
LINK_FLAGS " -Wl,-O3")
endif()
if(LLVM_LINKER_IS_GOLD)
# With gold gc-sections is always safe.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
endif()
if(NOT LLVM_NO_DEAD_STRIP)
if(${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)
elseif(NOT WIN32 AND NOT LLVM_LINKER_IS_GOLD)
# 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