include(CheckCXXCompilerFlag)

if(CMAKE_COMPILER_IS_GNUCXX OR ${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
    CHECK_CXX_COMPILER_FLAG("-std=c++2a" COMPILER_SUPPORTS_CXX2A)
    CHECK_CXX_COMPILER_FLAG("-std=c++17" COMPILER_SUPPORTS_CXX17)
    CHECK_CXX_COMPILER_FLAG("-std=c++14" COMPILER_SUPPORTS_CXX14)
    CHECK_CXX_COMPILER_FLAG("-std=c++11" COMPILER_SUPPORTS_CXX11)
    CHECK_CXX_COMPILER_FLAG("-std=c++0x" COMPILER_SUPPORTS_CXX0X)
    if(COMPILER_SUPPORTS_CXX2A)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++2a")
    elseif(COMPILER_SUPPORTS_CXX17)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
    elseif(COMPILER_SUPPORTS_CXX14)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
    elseif(COMPILER_SUPPORTS_CXX11)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
    elseif(COMPILER_SUPPORTS_CXX0X)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
    elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++2a")
    elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 5.0)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17")
    elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.5)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")
    elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.4)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y")
    elseif(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang" AND NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 3.1)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
    else()
        message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++11 support. Please use a different C++ compiler.")
    endif()
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wfloat-equal -Wno-long-long -Wpedantic -funsigned-char")
    set(CMAKE_CXX_FLAGS_DEBUG "-g3 -fexceptions -O0 -D_DEBUG -DDEBUG")
    add_definitions("-D_WINDOWS -D_UNICODE -DUNICODE")
endif()

if(CMAKE_COMPILER_IS_GNUCXX)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mwin32 -mthreads -municode")
endif(CMAKE_COMPILER_IS_GNUCXX)

if(MSVC)
    CHECK_CXX_COMPILER_FLAG("-std:c++latest" COMPILER_SUPPORTS_CXXLATEST)
    CHECK_CXX_COMPILER_FLAG("-std:c++17" COMPILER_SUPPORTS_CXX17)
    if(COMPILER_SUPPORTS_CXXLATEST)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std:c++latest")
    elseif(COMPILER_SUPPORTS_CXX17)
        set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std:c++17")
    else()
        message(STATUS "The compiler ${CMAKE_CXX_COMPILER} has no C++17 support. Please use a different C++ compiler.")
    endif()
    add_definitions("-wd4503 -D_UNICODE -DUNICODE")
endif(MSVC)