66 lines
2.3 KiB
CMake
66 lines
2.3 KiB
CMake
include(CheckCXXCompilerFlag)
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include(CheckLinkerFlag)
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include(CheckIPOSupported)
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# Portable IPO/LTO detection (avoid in Debug)
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check_ipo_supported(RESULT _YAMS_IPO_OK OUTPUT _YAMS_IPO_MSG)
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# Multi-config generators: set per-config; Single-config: respect CMAKE_BUILD_TYPE
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if(_YAMS_IPO_OK)
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if(CMAKE_CONFIGURATION_TYPES)
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foreach(_cfg Release RelWithDebInfo MinSizeRel)
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string(TOUPPER "${_cfg}" _CFG_UP)
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set("CMAKE_INTERPROCEDURAL_OPTIMIZATION_${_CFG_UP}" ON CACHE BOOL "IPO for ${_cfg}" FORCE)
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endforeach()
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# Ensure Debug stays off for fast, deterministic testing
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set(CMAKE_INTERPROCEDURAL_OPTIMIZATION_DEBUG OFF CACHE BOOL "IPO for Debug" FORCE)
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else()
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if(CMAKE_BUILD_TYPE AND NOT CMAKE_BUILD_TYPE MATCHES "^[Dd]ebug$")
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set(CMAKE_INTERPROCEDURAL_OPTIMIZATION ON)
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endif()
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endif()
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else()
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message(STATUS "IPO/LTO not supported: ${_YAMS_IPO_MSG}")
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endif()
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# Control preferring LLD (-fuse-ld=lld) on ELF platforms (disabled on Apple)
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if(NOT DEFINED YAMS_PREFER_LLD)
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set(YAMS_PREFER_LLD ON)
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endif()
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# Prefer LLD when available (ELF platforms)
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set(_YAMS_TRY_LLD FALSE)
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# Only try LLD when explicitly preferred, not on Apple (Darwin) where -fuse-ld=lld is unsupported
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if(YAMS_PREFER_LLD AND NOT APPLE AND CMAKE_CXX_COMPILER_ID MATCHES "Clang|GNU")
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check_linker_flag(CXX "-fuse-ld=lld" _YAMS_LLD_OK)
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if(_YAMS_LLD_OK)
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add_link_options(-fuse-ld=lld)
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set(_YAMS_TRY_LLD TRUE)
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message(STATUS "Using LLD via -fuse-ld=lld")
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else()
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message(STATUS "LLD not available; using default linker")
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endif()
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endif()
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# Prefer ThinLTO under Clang for Release-like configs only
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if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
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if(CMAKE_CONFIGURATION_TYPES)
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# Apply per-config using generator expressions
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add_link_options($<$<CONFIG:Release,RelWithDebInfo,MinSizeRel>:-flto=thin>)
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else()
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if(CMAKE_BUILD_TYPE AND NOT CMAKE_BUILD_TYPE MATCHES "^[Dd]ebug$")
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add_link_options(-flto=thin)
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endif()
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endif()
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message(STATUS "Clang detected; preferring ThinLTO in Release-like builds")
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endif()
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# Helpful defaults for Release builds
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if(CMAKE_BUILD_TYPE MATCHES "^[Rr]elease$")
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add_compile_options(-ffunction-sections -fdata-sections)
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if(APPLE)
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add_link_options(-Wl,-dead_strip)
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elseif(_YAMS_TRY_LLD)
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add_link_options(-Wl,--gc-sections)
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endif()
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endif()
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