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).
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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
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@ -648,6 +648,9 @@ endif()
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# ----------------------------------------------------------------------------
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# Compilers
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# Only set the linker once.
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set(_IS_LINKER_DEFAULT ON)
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# GNU Compiler
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if(CMAKE_COMPILER_IS_GNUCC)
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# ffp-contract=off:
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@ -666,43 +669,15 @@ if(CMAKE_COMPILER_IS_GNUCC)
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string(PREPEND CMAKE_CXX_FLAGS_RELWITHDEBINFO "${GCC_EXTRA_FLAGS_RELEASE} ")
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unset(GCC_EXTRA_FLAGS_RELEASE)
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if(WITH_LINKER_GOLD)
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version
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ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
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if("${LD_VERSION}" MATCHES "GNU gold")
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=gold")
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string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=gold")
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string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=gold")
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else()
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message(STATUS "GNU gold linker isn't available, using the default system linker.")
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endif()
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unset(LD_VERSION)
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endif()
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if(WITH_LINKER_LLD)
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} -fuse-ld=lld -Wl,--version
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ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
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if("${LD_VERSION}" MATCHES "LLD")
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=lld")
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string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=lld")
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string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=lld")
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else()
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message(STATUS "LLD linker isn't available, using the default system linker.")
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endif()
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unset(LD_VERSION)
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endif()
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# NOTE(@campbellbarton): Eventually mold will be able to use `-fuse-ld=mold`,
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# however at the moment this only works for GCC 12.1+ (unreleased at time of writing).
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# So a workaround is used here "-B" which points to another path to find system commands
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# such as `ld`.
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if(WITH_LINKER_MOLD)
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if(WITH_LINKER_MOLD AND _IS_LINKER_DEFAULT)
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find_program(MOLD_BIN "mold")
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mark_as_advanced(MOLD_BIN)
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if(NOT MOLD_BIN)
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message(STATUS "The \"mold\" binary could not be found, using system linker!")
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message(STATUS "The \"mold\" binary could not be found, using system linker.")
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set(WITH_LINKER_MOLD OFF)
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else()
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# By default mold installs the binary to:
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@ -732,7 +707,7 @@ if(CMAKE_COMPILER_IS_GNUCC)
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if(NOT MOLD_BIN_DIR)
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message(STATUS
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"The mold linker could not find the directory containing the linker command "
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"(typically \"${MOLD_PREFIX}/lib/mold\"), using system linker!")
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"(typically \"${MOLD_PREFIX}/lib/mold\"), using system linker.")
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set(WITH_LINKER_MOLD OFF)
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endif()
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unset(MOLD_PREFIX)
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@ -740,35 +715,68 @@ if(CMAKE_COMPILER_IS_GNUCC)
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if(WITH_LINKER_MOLD)
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# GCC will search for `ld` in this directory first.
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
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string(APPEND CMAKE_SHARED_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
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string(APPEND CMAKE_MODULE_LINKER_FLAGS " -B \"${MOLD_BIN_DIR}\"")
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set(_IS_LINKER_DEFAULT OFF)
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endif()
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unset(MOLD_BIN)
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unset(MOLD_BIN_DIR)
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endif()
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if(WITH_LINKER_GOLD AND _IS_LINKER_DEFAULT)
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} -fuse-ld=gold -Wl,--version
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ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
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if("${LD_VERSION}" MATCHES "GNU gold")
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=gold")
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string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=gold")
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string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=gold")
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set(_IS_LINKER_DEFAULT OFF)
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else()
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message(STATUS "GNU gold linker isn't available, using the default system linker.")
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endif()
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unset(LD_VERSION)
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endif()
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if(WITH_LINKER_LLD AND _IS_LINKER_DEFAULT)
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execute_process(
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COMMAND ${CMAKE_C_COMPILER} -fuse-ld=lld -Wl,--version
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ERROR_QUIET OUTPUT_VARIABLE LD_VERSION)
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if("${LD_VERSION}" MATCHES "LLD")
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=lld")
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string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=lld")
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string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=lld")
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set(_IS_LINKER_DEFAULT OFF)
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else()
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message(STATUS "LLD linker isn't available, using the default system linker.")
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endif()
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unset(LD_VERSION)
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endif()
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# CLang is the same as GCC for now.
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elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
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set(PLATFORM_CFLAGS "-pipe -fPIC -funsigned-char -fno-strict-aliasing")
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if(WITH_LINKER_MOLD)
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if(WITH_LINKER_MOLD AND _IS_LINKER_DEFAULT)
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find_program(MOLD_BIN "mold")
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mark_as_advanced(MOLD_BIN)
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if(NOT MOLD_BIN)
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message(STATUS "The \"mold\" binary could not be found, using system linker!")
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message(STATUS "The \"mold\" binary could not be found, using system linker.")
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set(WITH_LINKER_MOLD OFF)
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else()
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if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 12.0)
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string(APPEND CMAKE_EXE_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
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string(APPEND CMAKE_EXE_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
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string(APPEND CMAKE_SHARED_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
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string(APPEND CMAKE_MODULE_LINKER_FLAGS " --ld-path=\"${MOLD_BIN}\"")
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else()
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
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string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
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string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
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string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=\"${MOLD_BIN}\"")
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endif()
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set(_IS_LINKER_DEFAULT OFF)
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endif()
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unset(MOLD_BIN)
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endif()
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# Intel C++ Compiler
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@ -794,6 +802,8 @@ elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
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string(APPEND PLATFORM_LINKFLAGS " -static-intel")
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endif()
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unset(_IS_LINKER_DEFAULT)
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# Avoid conflicts with Mesa llvmpipe, Luxrender, and other plug-ins that may
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# use the same libraries as Blender with a different version or build options.
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set(PLATFORM_LINKFLAGS
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