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cmake: should detect c++11 before enabling it

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Signed-off-by: Kefu Chai <kchai@redhat.com>
This commit is contained in:
Kefu Chai 2016-12-08 09:48:24 +08:00
parent 66953e3224
commit dfa7de61b1
1 changed files with 5 additions and 4 deletions
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9
src/CMakeLists.txt
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@ -123,14 +123,15 @@ endif(no_yasm)
if(CMAKE_VERSION VERSION_LESS "3.1")
include(CheckCXXCompilerFlag)
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
if(COMPILER_SUPPORTS_CXX11)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
else()
message(FATAL_ERROR "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support.")
if(NOT COMPILER_SUPPORTS_CXX11)
message(FATAL_ERROR
"The compiler ${CMAKE_CXX_COMPILER} has no C++11 support.")
endif()
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
else()
set(CMAKE_CXX_STANDARD 11)
set(CMAKE_CXX_EXTENSIONS OFF)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
endif()
## Handle diagnostics color if compiler supports them.