apacheGH-40400: Add support for LLD

cryos · Apr 5, 2024 · 9a857a4 · 9a857a4
1 parent 074d45f
commit 9a857a4
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diff --git a/cpp/cmake_modules/DefineOptions.cmake b/cpp/cmake_modules/DefineOptions.cmake
@@ -170,6 +170,8 @@ takes precedence over ccache if a storage backend is configured" ON)
 
  define_option(ARROW_USE_LD_GOLD "Use ld.gold for linking on Linux (if available)" OFF)
 
+ define_option(ARROW_USE_LLD "Use the LLVM lld for linking on Linux (if available)" OFF)
+
  define_option(ARROW_USE_MOLD "Use mold for linking on Linux (if available)" OFF)
 
  define_option(ARROW_USE_PRECOMPILED_HEADERS "Use precompiled headers when compiling"

diff --git a/cpp/cmake_modules/SetupCxxFlags.cmake b/cpp/cmake_modules/SetupCxxFlags.cmake
@@ -660,6 +660,18 @@ if(NOT WIN32 AND NOT APPLE)
  else()
  message(STATUS "Using the default linker because mold isn't found")
  endif()
+ elseif(ARROW_USE_LLD AND CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+ # For GCC make sure the compiler flag is supported and use it if so for linking.
+ set(LLD_LINKER_FLAGS "-fuse-ld=lld")
+ check_cxx_compiler_flag("${LLD_LINKER_FLAGS}" CXX_SUPPORTS_LLD)
+ if(CXX_SUPPORTS_LLD)
+ message(STATUS "Using optional LLVM LLD linker")
+ string(APPEND CMAKE_EXE_LINKER_FLAGS " ${LLD_LINKER_FLAGS}")
+ string(APPEND CMAKE_MODULE_LINKER_FLAGS " ${LLD_LINKER_FLAGS}")
+ string(APPEND CMAKE_SHARED_LINKER_FLAGS " ${LLD_LINKER_FLAGS}")
+ else()
+ message(STATUS "Using the default linker because the LLD linker flags don't work")
+ endif()
  endif()
 endif()