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if(ENABLE_MOLD)
if(CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 12)
# GCC < 12 doesn't support -fuse-ld=mold, so we have to use tools prefix path
# if mold is installed in a non-standard dir, users can set -DMOLD_PREFIX=/path/to/mold_install_prefix
find_path(MOLD_PREFIX_DIR NAMES ld
NO_DEFAULT_PATH # this is needed, otherwise we find /usr/bin/ld
PATH_SUFFIXES libexec/mold
PATHS ${MOLD_PREFIX} /usr /usr/local)
if(MOLD_PREFIX_DIR)
set(COMPILER_ARGS "-B${MOLD_PREFIX_DIR}")
else()
message(WARNING "Mold LD path not found, you might need to set -DMOLD_PREFIX=/path/to/mold_install_prefix")
endif()
else()
set(COMPILER_ARGS "-fuse-ld=mold")
endif()
execute_process(COMMAND ${CMAKE_CXX_COMPILER} ${COMPILER_ARGS} -Wl,--version ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
set(DEFAULT_ENABLE_DEBUGFISSION FALSE)
if(CMAKE_BUILD_TYPE STREQUAL Debug OR
CMAKE_BUILD_TYPE STREQUAL RelWithDebInfo)
set(DEFAULT_ENABLE_DEBUGFISSION TRUE)
endif()
include(CMakeDependentOption)
cmake_dependent_option(ENABLE_DEBUGFISSION "Enable Debug Fission support" ON
"DEFAULT_ENABLE_DEBUGFISSION" OFF)
if(ENABLE_DEBUGFISSION)
include(TestCXXAcceptsFlag)
check_cxx_accepts_flag(-gsplit-dwarf CXX_ACCEPTS_GSPLIT_DWARF)
# extract mold version
set(LD_VERSION_LIST ${LD_VERSION})
separate_arguments(LD_VERSION_LIST)
list(GET LD_VERSION_LIST 1 MOLD_VERSION)
set(DEBUGFISSION_AVAILABLE FALSE)
if(CXX_ACCEPTS_GSPLIT_DWARF)
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -gsplit-dwarf")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -gsplit-dwarf")
if(${MOLD_VERSION} VERSION_GREATER_EQUAL "1.2.0")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gdb-index")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gdb-index")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--gdb-index")
set(DEBUGFISSION_AVAILABLE TRUE)
endif()
endif()
if(DEBUGFISSION_AVAILABLE)
message(STATUS "Debug Fission enabled")
else()
message(WARNING "Debug Fission is not available")
endif()
endif()
if(LD_VERSION MATCHES "mold")
include(FindPackageHandleStandardArgs)
find_program(MOLD_EXECUTABLE mold)
find_package_handle_standard_args(MOLD REQUIRED_VARS MOLD_EXECUTABLE)
if(MOLD_FOUND)
set(CMAKE_LINKER ${MOLD_EXECUTABLE})
set(CMAKE_CXX_LINK_FLAGS ${COMPILER_ARGS})
set(CMAKE_C_LINK_FLAGS ${COMPILER_ARGS})
set(CMAKE_EXE_LINKER_FLAGS "${LD_FLAGS} ${COMPILER_ARGS} ${CMAKE_EXE_LINKER_FLAGS}")
set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
set(CMAKE_MODULE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS}")
message(STATUS "Linker: mold")
endif()
mark_as_advanced(MOLD_EXECUTABLE CMAKE_LINKER)
else()
message(FATAL_ERROR "Mold linker not found")
endif()
endif()
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