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Use alternate linker (mold, gold, etc)

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This commit is contained in:
Loïc Bartoletti 2022-07-08 07:44:21 +02:00
parent 52a34cc7b7
commit db4cf8a96f
2 changed files with 46 additions and 0 deletions
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4
CMakeLists.txt
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@ -731,6 +731,10 @@ if(ENABLE_COVERAGE)
SETUP_TARGET_FOR_COVERAGE(qgis_coverage ctest coverage)
endif()
if(USE_ALTERNATE_LINKER)
include("cmake/modules/linker.cmake")
endif()
#############################################################
# platform specific stuff
if (WITH_CORE)

42
cmake/modules/linker.cmake Normal file
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@ -0,0 +1,42 @@
macro(set_alternate_linker linker)
if( NOT "${USE_ALTERNATE_LINKER}" STREQUAL "${USE_ALTERNATE_LINKER_OLD_CACHED}" )
unset(LINKER_EXECUTABLE CACHE)
endif()
find_program(LINKER_EXECUTABLE ld.${USE_ALTERNATE_LINKER} ${USE_ALTERNATE_LINKER})
if(LINKER_EXECUTABLE)
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
if( "${CMAKE_CXX_COMPILER_VERSION}" VERSION_GREATER_EQUAL 12.0.0)
add_link_options("--ld-path=${LINKER_EXECUTABLE}")
else()
add_link_options("-fuse-ld=${LINKER_EXECUTABLE}")
endif()
elseif( "${linker}" STREQUAL "mold" AND
"${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" AND
"${CMAKE_CXX_COMPILER_VERSION}" VERSION_LESS 12.1.0)
# GCC before 12.1.0: -fuse-ld does not accept mold as a valid argument,
# so you need to use -B option instead.
get_filename_component(_dir ${LINKER_EXECUTABLE} DIRECTORY)
get_filename_component(_dir ${_dir} DIRECTORY)
if( EXISTS "${_dir}/libexec/mold/ld" )
add_link_options(-B "${_dir}/libexec/mold")
else()
message(FATAL_ERROR "Cannot find ${_dir}/libexec/mold/ld")
endif()
else()
add_link_options("-fuse-ld=${USE_ALTERNATE_LINKER}")
endif()
message(STATUS "Using alternative linker: ${LINKER_EXECUTABLE}")
else()
message(FATAL_ERROR "Cannot find alternative linker ${USE_ALTERNATE_LINKER}")
endif()
endmacro()
if( "${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang" OR "${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU" )
set(USE_ALTERNATE_LINKER "" CACHE STRING "Use alternate linker. Leave empty for system default; potential alternatives are 'gold', 'lld', 'bfd', 'mold'")
if(NOT "${USE_ALTERNATE_LINKER}" STREQUAL "")
set_alternate_linker(${USE_ALTERNATE_LINKER})
endif()
set(USE_ALTERNATE_LINKER_OLD_CACHED
${USE_ALTERNATE_LINKER}
CACHE INTERNAL "Previous value of USE_ALTERNATE_LINKER")
endif()