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Power does not use -march

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Konstantinos Margaritis 2021-12-02 18:01:26 +02:00
parent 5aae719ecd
commit 451d539f1d
1 changed files with 9 additions and 3 deletions
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12
CMakeLists.txt
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@ -154,6 +154,12 @@ endif ()
# Detect best GNUCC_ARCH to tune for
if (CMAKE_COMPILER_IS_GNUCC AND NOT CROSS_COMPILE)
message(STATUS "gcc version ${CMAKE_C_COMPILER_VERSION}")
if(ARCH_PPC64EL)
set(ARCH_FLAG mcpu)
else()
set(ARCH_FLAG march)
endif()
# If gcc doesn't recognise the host cpu, then mtune=native becomes
# generic, which isn't very good in some cases. march=native looks at
# cpuid info and then chooses the best microarch it can (and replaces
@ -161,12 +167,12 @@ if (CMAKE_COMPILER_IS_GNUCC AND NOT CROSS_COMPILE)
# arg1 might exist if using ccache
string (STRIP "${CMAKE_C_COMPILER_ARG1}" CC_ARG1)
set (EXEC_ARGS ${CC_ARG1} -c -Q --help=target -march=native -mtune=native)
set (EXEC_ARGS ${CC_ARG1} -c -Q --help=target -${ARCH_FLAG}=native -mtune=native)
execute_process(COMMAND ${CMAKE_C_COMPILER} ${EXEC_ARGS}
OUTPUT_VARIABLE _GCC_OUTPUT)
string(FIND "${_GCC_OUTPUT}" "march" POS)
string(FIND "${_GCC_OUTPUT}" "${ARCH_FLAG}" POS)
string(SUBSTRING "${_GCC_OUTPUT}" ${POS} -1 _GCC_OUTPUT)
string(REGEX REPLACE "march=[ \t]*([^ \n]*)[ \n].*" "\\1" GNUCC_ARCH "${_GCC_OUTPUT}")
string(REGEX REPLACE "${ARCH_FLAG}=[ \t]*([^ \n]*)[ \n].*" "\\1" GNUCC_ARCH "${_GCC_OUTPUT}")
# test the parsed flag
set (EXEC_ARGS ${CC_ARG1} -E - -mtune=${GNUCC_ARCH})