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cmake: simplify g++ version check

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This commit is contained in:
Matthew Barr 2017-03-17 09:11:53 +11:00
parent 11aac07855
commit 5daa191313
1 changed files with 9 additions and 16 deletions
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25
CMakeLists.txt
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@ -151,22 +151,6 @@ if(MSVC OR MSVC_IDE)
else()
# compiler version checks TODO: test more compilers
if (CMAKE_COMPILER_IS_GNUCXX)
set (GNUCXX_MINVER "4.8.1")
exec_program(${CMAKE_CXX_COMPILER}
ARGS ${CMAKE_CXX_COMPILER_ARG1} --version
OUTPUT_VARIABLE _GXX_OUTPUT)
# is the following too fragile?
string(REGEX REPLACE ".* ([0-9]\\.[0-9](\\.[0-9])?)( |\n).*" "\\1"
GNUCXX_VERSION "${_GXX_OUTPUT}")
message(STATUS "g++ version ${GNUCXX_VERSION}")
if (GNUCXX_VERSION VERSION_LESS ${GNUCXX_MINVER})
message(FATAL_ERROR "A minimum of g++ ${GNUCXX_MINVER} is required for C++11 support")
endif()
unset(_GXX_OUTPUT)
endif()
# remove CMake's idea of optimisation
foreach (CONFIG ${CMAKE_BUILD_TYPE} ${CMAKE_CONFIGURATION_TYPES})
string(REGEX REPLACE "-O[^ ]*" "" CMAKE_C_FLAGS_${CONFIG} "${CMAKE_C_FLAGS_${CONFIG}}")
@ -174,6 +158,7 @@ else()
endforeach ()
if (CMAKE_COMPILER_IS_GNUCC)
message(STATUS "gcc version ${CMAKE_C_COMPILER_VERSION}")
# 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
@ -201,6 +186,14 @@ else()
set(TUNE_FLAG native)
endif()
# compiler version checks TODO: test more compilers
if (CMAKE_COMPILER_IS_GNUCXX)
set(GNUCXX_MINVER "4.8.1")
message(STATUS "g++ version ${CMAKE_CXX_COMPILER_VERSION}")
if (CMAKE_CXX_COMPILER_VERSION VERSION_LESS GNUCXX_MINVER)
message(FATAL_ERROR "A minimum of g++ ${GNUCXX_MINVER} is required for C++11 support")
endif()
endif()
if(OPTIMISE)
set(OPT_C_FLAG "-O3")