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CMake: only ever enable one alternative linker for UNIX/GCC 

Since the option to enable linkers are booleans,
it's possible to enable them all at once.

Now only the first enabled + available linker is used
(with priority given to link is with better performance).
This commit is contained in:
Campbell Barton 2022-01-15 16:36:08 +11:00
parent 18c5d4ccb3
commit e69020ad0f
Notes: blender-bot 2023-02-14 05:28:01 +01:00 
Referenced by issue #96894, Regression: Exported sculpt details are missing till you press clear custom split normals (e.g. after FBX export/import roundtrip)
Referenced by issue #95591, Crash on drawing with measure tool
1 changed files with 46 additions and 36 deletions
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82
build_files/cmake/platform/platform_unix.cmake
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@ -648,6 +648,9 @@ endif()
# ----------------------------------------------------------------------------
# Compilers
# Only set the linker once.
set(_IS_LINKER_DEFAULT ON)
# GNU Compiler
if(CMAKE_COMPILER_IS_GNUCC)
# ffp-contract=off:
@ -666,43 +669,15 @@ if(CMAKE_COMPILER_IS_GNUCC)
string(PREPEND CMAKE_CXX_FLAGS_RELWITHDEBINFO "${GCC_EXTRA_FLAGS_RELEASE} ")
unset(GCC_EXTRA_FLAGS_RELEASE)
if(WITH_LINKER_GOLD)
execute_process(
COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version
ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
if("${LD_VERSION}" MATCHES "GNU gold")
string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=gold")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=gold")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=gold")
else()
message(STATUS "GNU gold linker isn't available, using the default system linker.")
endif()
unset(LD_VERSION)
endif()
if(WITH_LINKER_LLD)
execute_process(
COMMAND ${CMAKE_C_COMPILER} -fuse-ld=lld -Wl,--version
ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
if("${LD_VERSION}" MATCHES "LLD")
string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=lld")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=lld")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=lld")
else()
message(STATUS "LLD linker isn't available, using the default system linker.")
endif()
unset(LD_VERSION)
endif()
# NOTE(@campbellbarton): Eventually mold will be able to use `-fuse-ld=mold`,
# however at the moment this only works for GCC 12.1+ (unreleased at time of writing).
# So a workaround is used here "-B" which points to another path to find system commands
# such as `ld`.
if(WITH_LINKER_MOLD)
if(WITH_LINKER_MOLD AND _IS_LINKER_DEFAULT)
find_program(MOLD_BIN "mold")
mark_as_advanced(MOLD_BIN)
if(NOT MOLD_BIN)
message(STATUS "The \"mold\" binary could not be found, using system linker!")
message(STATUS "The \"mold\" binary could not be found, using system linker.")
set(WITH_LINKER_MOLD OFF)
else()
# By default mold installs the binary to:
@ -732,7 +707,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
if(NOT MOLD_BIN_DIR)
message(STATUS
"The mold linker could not find the directory containing the linker command "
"(typically \"${MOLD_PREFIX}/lib/mold\"), using system linker!")
"(typically \"${MOLD_PREFIX}/lib/mold\"), using system linker.")
set(WITH_LINKER_MOLD OFF)
endif()
unset(MOLD_PREFIX)
@ -740,35 +715,68 @@ if(CMAKE_COMPILER_IS_GNUCC)
if(WITH_LINKER_MOLD)
# GCC will search for `ld` in this directory first.
string(APPEND CMAKE_EXE_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
string(APPEND CMAKE_EXE_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
set(_IS_LINKER_DEFAULT OFF)
endif()
unset(MOLD_BIN)
unset(MOLD_BIN_DIR)
endif()
if(WITH_LINKER_GOLD AND _IS_LINKER_DEFAULT)
execute_process(
COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version
ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
if("${LD_VERSION}" MATCHES "GNU gold")
string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=gold")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=gold")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=gold")
set(_IS_LINKER_DEFAULT OFF)
else()
message(STATUS "GNU gold linker isn't available, using the default system linker.")
endif()
unset(LD_VERSION)
endif()
if(WITH_LINKER_LLD AND _IS_LINKER_DEFAULT)
execute_process(
COMMAND ${CMAKE_C_COMPILER} -fuse-ld=lld -Wl,--version
ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
if("${LD_VERSION}" MATCHES "LLD")
string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=lld")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=lld")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=lld")
set(_IS_LINKER_DEFAULT OFF)
else()
message(STATUS "LLD linker isn't available, using the default system linker.")
endif()
unset(LD_VERSION)
endif()
# CLang is the same as GCC for now.
elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
set(PLATFORM_CFLAGS "-pipe -fPIC -funsigned-char -fno-strict-aliasing")
if(WITH_LINKER_MOLD)
if(WITH_LINKER_MOLD AND _IS_LINKER_DEFAULT)
find_program(MOLD_BIN "mold")
mark_as_advanced(MOLD_BIN)
if(NOT MOLD_BIN)
message(STATUS "The \"mold\" binary could not be found, using system linker!")
message(STATUS "The \"mold\" binary could not be found, using system linker.")
set(WITH_LINKER_MOLD OFF)
else()
if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 12.0)
string(APPEND CMAKE_EXE_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
string(APPEND CMAKE_EXE_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
else()
string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
endif()
set(_IS_LINKER_DEFAULT OFF)
endif()
unset(MOLD_BIN)
endif()
# Intel C++ Compiler
@ -794,6 +802,8 @@ elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
string(APPEND PLATFORM_LINKFLAGS " -static-intel")
endif()
unset(_IS_LINKER_DEFAULT)
# Avoid conflicts with Mesa llvmpipe, Luxrender, and other plug-ins that may
# use the same libraries as Blender with a different version or build options.
set(PLATFORM_LINKFLAGS