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[CMake] Unify LLVM_LINKER_IS_GOLD -Wl,--gc-sections setting with GNU ld and LLD

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This commit is contained in:
Fangrui Song 2020-11-23 19:46:52 -08:00
parent 54a60a2fc7
commit 0603186a8e
1 changed files with 1 additions and 14 deletions
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15
cmake/modules/AddLLVM.cmake
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@ -228,14 +228,6 @@ 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 ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")
# Note that there is a bug with -Wl,--icf=safe so it is not safe
# to enable. See https://sourceware.org/bugzilla/show_bug.cgi?id=17704.
endif()
if(NOT LLVM_NO_DEAD_STRIP)
if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
# ld64's implementation of -dead_strip breaks tools that use plugins.
@ -250,12 +242,7 @@ function(add_link_opts target_name)
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,-z,discard-unused=sections")
endif()
elseif(NOT WIN32 AND NOT LLVM_LINKER_IS_GOLD AND
NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD|AIX|OS390")
# 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.
elseif(NOT WIN32 AND NOT CMAKE_SYSTEM_NAME MATCHES "OpenBSD|AIX|OS390")
# TODO Revisit this later on z/OS.
set_property(TARGET ${target_name} APPEND_STRING PROPERTY
LINK_FLAGS " -Wl,--gc-sections")