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CMake: Use lld when using Clang compiler 

When using the `WITH_LINKER_LLD` option, the logic to find the `ld.lld`
binary and actually tell the build system to use it was specific to GCC.

I've copied the Clang-specific logic for Mold and adjusted it to find
LLD.

Not entirely sure why this is necessary, as LLD is actually Clang's
linker. However, without this change, CMake would use regular old slow
`ld` to link.

Pull Request: https://projects.blender.org/blender/blender/pulls/108884
This commit is contained in:
Sybren A. Stüvel 2023-06-16 10:33:30 +02:00
parent 4a0468c1ed
commit 8c8e1ebdd2
1 changed files with 21 additions and 0 deletions
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21
build_files/cmake/platform/platform_unix.cmake
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@ -928,6 +928,27 @@ elseif(CMAKE_C_COMPILER_ID MATCHES "Clang")
unset(MOLD_BIN)
endif()
if(WITH_LINKER_LLD AND _IS_LINKER_DEFAULT)
find_program(LLD_BIN "ld.lld")
mark_as_advanced(LLD_BIN)
if(NOT LLD_BIN)
message(STATUS "The \"ld.lld\" binary could not be found, using system linker.")
set(WITH_LINKER_LLD OFF)
else()
if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 12.0)
string(APPEND CMAKE_EXE_LINKER_FLAGS " --ld-path=\"${LLD_BIN}\"")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " --ld-path=\"${LLD_BIN}\"")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " --ld-path=\"${LLD_BIN}\"")
else()
string(APPEND CMAKE_EXE_LINKER_FLAGS " -fuse-ld=\"${LLD_BIN}\"")
string(APPEND CMAKE_SHARED_LINKER_FLAGS " -fuse-ld=\"${LLD_BIN}\"")
string(APPEND CMAKE_MODULE_LINKER_FLAGS " -fuse-ld=\"${LLD_BIN}\"")
endif()
set(_IS_LINKER_DEFAULT OFF)
endif()
unset(LLD_BIN)
endif()
# Intel C++ Compiler
elseif(CMAKE_C_COMPILER_ID MATCHES "Intel")
# think these next two are broken