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Disable all link optimizations in a debug build.

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This taking linking clang on my machine with gold from 16.980257914 to
15.933037649 seconds.

llvm-svn: 234161
This commit is contained in:
Rafael Espindola 2015-04-06 15:04:31 +00:00
parent 17068f343b
commit 3e664c2fee
1 changed files with 28 additions and 25 deletions
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53
cmake/modules/AddLLVM.cmake
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@ -158,35 +158,38 @@ if(NOT WIN32 AND NOT APPLE)
endif()
function(add_link_opts target_name)
# Pass -O3 to the linker. This enabled different optimizations on different
# linkers. Don't do it in debug builds since it slows down the linker
# in a context where the optimizations are not important.
if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32) AND
NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,-O3")
endif()
# Don't use linker optimizations in debug builds since it slows down the
# linker in a context where the optimizations are not important.
if (NOT uppercase_CMAKE_BUILD_TYPE STREQUAL "DEBUG")
if(LLVM_LINKER_IS_GOLD)
# With gold gc-sections is always safe.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
# Note that there is a bug with -Wl,--icf=safe so it is not safe
# to enable. See https://sourceware.org/bugzilla/show_bug.cgi?id=17704.
endif()
if(NOT LLVM_NO_DEAD_STRIP)
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
# ld64's implementation of -dead_strip breaks tools that use plugins.
# Pass -O3 to the linker. This enabled different optimizations on different
# linkers.
if(NOT (${CMAKE_SYSTEM_NAME} MATCHES "Darwin" OR WIN32))
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,-dead_strip")
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
# a newer linker.
LINK_FLAGS " -Wl,-O3")
endif()
if(LLVM_LINKER_IS_GOLD)
# With gold gc-sections is always safe.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
# Note that there is a bug with -Wl,--icf=safe so it is not safe
# to enable. See https://sourceware.org/bugzilla/show_bug.cgi?id=17704.
endif()
if(NOT LLVM_NO_DEAD_STRIP)
if(${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 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
# a newer linker.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
endif()
endif()
endif()
endfunction(add_link_opts)