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cmake: override gcc's tuning guess

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This commit is contained in:
Matthew Barr 2017-03-15 16:49:05 +11:00
parent b68e4ea336
commit 11aac07855
1 changed files with 39 additions and 10 deletions
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49
CMakeLists.txt
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@ -173,6 +173,35 @@ else()
string(REGEX REPLACE "-O[^ ]*" "" CMAKE_CXX_FLAGS_${CONFIG} "${CMAKE_CXX_FLAGS_${CONFIG}}")
endforeach ()
if (CMAKE_COMPILER_IS_GNUCC)
# If gcc doesn't recognise the host cpu, then mtune=native becomes
# generic, which isn't very good in some cases. march=native looks at
# cpuid info and then chooses the best microarch it can (and replaces
# the flag), so use that for tune.
# arg1 might exist if using ccache
string (STRIP "${CMAKE_C_COMPILER_ARG1}" CC_ARG1)
set (EXEC_ARGS ${CC_ARG1} -c -Q --help=target -march=native -mtune=native)
execute_process(COMMAND ${CMAKE_C_COMPILER} ${EXEC_ARGS}
OUTPUT_VARIABLE _GCC_OUTPUT)
string(REGEX REPLACE ".*march=[ \t]*([^ \n]*)[ \n].*" "\\1"
GNUCC_ARCH "${_GCC_OUTPUT}")
# test the parsed flag
set (EXEC_ARGS ${CC_ARG1} -E - -mtune=${GNUCC_ARCH})
execute_process(COMMAND ${CMAKE_C_COMPILER} ${EXEC_ARGS}
OUTPUT_QUIET ERROR_QUIET
INPUT_FILE /dev/null
RESULT_VARIABLE GNUCC_TUNE_TEST)
if (NOT GNUCC_TUNE_TEST EQUAL 0)
message(SEND_ERROR "Something went wrong determining gcc tune: -mtune=${GNUCC_ARCH} not valid")
endif()
set(TUNE_FLAG ${GNUCC_ARCH})
else ()
set(TUNE_FLAG native)
endif()
if(OPTIMISE)
set(OPT_C_FLAG "-O3")
set(OPT_CXX_FLAG "-O2")
@ -197,12 +226,12 @@ else()
set(EXTRA_CXX_FLAGS "${EXTRA_CXX_FLAGS} -DNDEBUG")
endif()
if (NOT CMAKE_C_FLAGS MATCHES .*march.*)
set(ARCH_C_FLAGS "${ARCH_C_FLAGS} -march=native -mtune=native")
if (NOT CMAKE_C_FLAGS MATCHES .*march.* AND NOT CMAKE_C_FLAGS MATCHES .*mtune.*)
set(ARCH_C_FLAGS "-march=native -mtune=${TUNE_FLAG}")
endif()
if (NOT CMAKE_CXX_FLAGS MATCHES .*march.*)
set(ARCH_CXX_FLAGS "${ARCH_CXX_FLAGS} -march=native -mtune=native")
if (NOT CMAKE_CXX_FLAGS MATCHES .*march.* AND NOT CMAKE_CXX_FLAGS MATCHES .*mtune.*)
set(ARCH_CXX_FLAGS "-march=native -mtune=${TUNE_FLAG}")
endif()
if(CMAKE_COMPILER_IS_GNUCC)
@ -385,13 +414,13 @@ endif()
endif()
if (NOT FAT_RUNTIME)
message(STATUS "Building for current host CPU")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${ARCH_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARCH_CXX_FLAGS}")
message(STATUS "Building for current host CPU: ${ARCH_C_FLAGS}")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${ARCH_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${ARCH_CXX_FLAGS}")
else()
message(STATUS "Building runtime for multiple microarchitectures")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
message(STATUS "Building runtime for multiple microarchitectures")
set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
endif()
add_subdirectory(util)