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test availability of -march=native with clang #105

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e7edabe
test availability of -march=native
JoachimSchurig Oct 5, 2023
6328c80
test availability of -march=native
JoachimSchurig Oct 5, 2023
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26 changes: 24 additions & 2 deletions CMakeLists.txt
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Original file line number Diff line number Diff line change
Expand Up @@ -358,7 +358,29 @@ else(MSVC)
--post-js ${CMAKE_SOURCE_DIR}/wasm/post-module.js \
--shell-file ${CMAKE_SOURCE_DIR}/wasm/custom_shell.html")
else(COMPILE_WASM)
set(CMAKE_CXX_FLAGS "-std=c++11 -pthread ${CMAKE_GCC_FLAGS} -fPIC ${DISABLE_GLOBALLY} -march=${BUILD_ARCH} ${INTRINSICS} ${BUILD_WIDTH}")
if (BUILD_ARCH STREQUAL "native" AND CMAKE_CXX_COMPILER_ID MATCHES "Clang")
# clang does not support -march=native on all platforms
set(TEST_FILE_NAME "test_march.c")
set(TEST_FILES_DIR "${CMAKE_CURRENT_BINARY_DIR}/test_march_dir")
file(MAKE_DIRECTORY "${TEST_FILES_DIR}")
FILE(WRITE "${TEST_FILES_DIR}/${TEST_FILE_NAME}" "int main() { return 0; }")
EXECUTE_PROCESS(
WORKING_DIRECTORY "${TEST_FILES_DIR}"
COMMAND clang -march=native "${TEST_FILE_NAME}" -o test
RESULT_VARIABLE MARCH_RESULT
ERROR_QUIET
)
FILE(REMOVE_RECURSE "${TEST_FILES_DIR}")
if (MARCH_RESULT EQUAL 0)
set(BUILD_FOR "-march=native")
else()
set(BUILD_FOR "-mtune=native -mcpu=native")
endif()
else()
set(BUILD_FOR "-march=${BUILD_ARCH}")
endif()

set(CMAKE_CXX_FLAGS "-std=c++11 -pthread ${CMAKE_GCC_FLAGS} -fPIC ${DISABLE_GLOBALLY} ${BUILD_FOR} ${INTRINSICS} ${BUILD_WIDTH}")
set(CMAKE_CXX_FLAGS_RELEASE "-O3 ${BUILD_WIDTH} -funroll-loops")
set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g ${CMAKE_RDYNAMIC_FLAG}")
set(CMAKE_CXX_FLAGS_SLIM "-O3 ${BUILD_WIDTH} -funroll-loops -DNDEBUG")
Expand All @@ -368,7 +390,7 @@ else(MSVC)
set(CMAKE_CXX_FLAGS_PROFUSE "${CMAKE_CXX_FLAGS_RELWITHDEBINFO} -fprofile-use -fprofile-correction")

# these need to be set separately
set(CMAKE_C_FLAGS "-pthread ${CMAKE_GCC_FLAGS} -fPIC ${DISABLE_GLOBALLY} -march=${BUILD_ARCH} ${INTRINSICS}")
set(CMAKE_C_FLAGS "-pthread ${CMAKE_GCC_FLAGS} -fPIC ${DISABLE_GLOBALLY} ${BUILD_FOR} ${INTRINSICS}")
set(CMAKE_C_FLAGS_RELEASE "-O3 ${BUILD_WIDTH} -funroll-loops")
set(CMAKE_C_FLAGS_DEBUG "-O0 -g ${CMAKE_RDYNAMIC_FLAG}")
set(CMAKE_C_FLAGS_SLIM "-O3 ${BUILD_WIDTH} -funroll-loops -DNDEBUG")
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