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Improve checks for C++11 compiler flags

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This commit is contained in:
Guillaume Fraux 2017-05-15 11:00:42 +02:00
parent 7214a61084
commit 516a89f936
1 changed files with 29 additions and 2 deletions
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31
CMakeLists.txt
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@ -2,7 +2,34 @@ cmake_minimum_required(VERSION 2.8)
enable_testing()
project(toml11)
include_directories(${PROJECT_SOURCE_DIR})
add_definitions(-std=c++11)
include(CheckCXXCompilerFlag)
if("${CMAKE_VERSION}" VERSION_GREATER 3.1)
set(CMAKE_CXX_STANDARD 11)
set(CXX_STANDARD_REQUIRED ON)
else()
# Manually check for C++11 compiler flag.
CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
CHECK_CXX_COMPILER_FLAG("-std=gnu++11" COMPILER_SUPPORTS_GNU11)
CHECK_CXX_COMPILER_FLAG("-std=gnu++0x" COMPILER_SUPPORTS_GNU0X)
if(COMPILER_SUPPORTS_CXX11)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
elseif(COMPILER_SUPPORTS_CXXOX)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
elseif(COMPILER_SUPPORTS_GNU11)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
elseif(COMPILER_SUPPORTS_GNU0X)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++0x")
else()
if(MSVC)
if(MSVC_VERSION LESS 1900)
message(SEND_ERROR "MSVC < 14.0 is not supported. Please update your compiler or use mingw")
endif()
else()
message(SEND_ERROR "The ${CMAKE_CXX_COMPILER} compiler lacks C++11 support. Use another compiler.")
endif()
endif()
endif()
include_directories(${PROJECT_SOURCE_DIR})
add_subdirectory(tests)