looking-glass/cmake/OptimizeForNative.cmake
Quantum f4daa9f527 [all] cmake: fix OptimizeForNative
1. Correctly detect ON state so that host is not built as -march=native by
   default.
2. Merge OFF and GENERIC options as we need at least -march=nehalem to build
   properly.
2021-07-25 13:46:13 +10:00

30 lines
1.2 KiB
CMake

set(OPTIMIZE_FOR_NATIVE AUTO CACHE STRING "Build with -march=native")
set_property(CACHE OPTIMIZE_FOR_NATIVE PROPERTY STRINGS AUTO ON OFF)
set(OPTIMIZE_FOR_NATIVE_ARCH "none")
if(OPTIMIZE_FOR_NATIVE STREQUAL "ON" OR (OPTIMIZE_FOR_NATIVE STREQUAL "AUTO" AND OPTIMIZE_FOR_NATIVE_DEFAULT))
CHECK_C_COMPILER_FLAG("-march=native" COMPILER_SUPPORTS_MARCH_NATIVE)
if(COMPILER_SUPPORTS_MARCH_NATIVE)
set(OPTIMIZE_FOR_NATIVE_ARCH "native")
set(OPTIMIZE_FOR_NATIVE_ON ON)
endif()
elseif(OPTIMIZE_FOR_NATIVE STREQUAL "AUTO" OR OPTIMIZE_FOR_NATIVE STREQUAL "OFF")
CHECK_C_COMPILER_FLAG("-march=x86-64-v2" COMPILER_SUPPORTS_MARCH_X86_64_V2)
if(COMPILER_SUPPORTS_MARCH_X86_64_V2)
set(OPTIMIZE_FOR_NATIVE_ARCH "x86-64-v2")
else()
CHECK_C_COMPILER_FLAG("-march=nehalem" COMPILER_SUPPORTS_MARCH_NEHALEM)
if(COMPILER_SUPPORTS_MARCH_NEHALEM)
set(OPTIMIZE_FOR_NATIVE_ARCH "nehalem")
endif()
endif()
else()
set(OPTIMIZE_FOR_NATIVE_ARCH "${OPTIMIZE_FOR_NATIVE}")
set(OPTIMIZE_FOR_NATIVE_ON ON)
endif()
if(NOT OPTIMIZE_FOR_NATIVE_ARCH STREQUAL "none")
add_compile_options("-march=${OPTIMIZE_FOR_NATIVE_ARCH}")
endif()
add_feature_info(OPTIMIZE_FOR_NATIVE OPTIMIZE_FOR_NATIVE_ON "Optimized for ${OPTIMIZE_FOR_NATIVE_ARCH}")