FreeCAD

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# Some resources
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# https://github.com/dev-cafe/cmake-cookbook
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# https://cmake.org/cmake/help/v3.8/manual/cmake-compile-features.7.html
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macro(CompilerChecksAndSetups)
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    if (${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
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        set(CMAKE_COMPILER_IS_CLANGXX TRUE)
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    endif (${CMAKE_CXX_COMPILER_ID} MATCHES "Clang")
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    # ================================================================================
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    # Needed for boost1.69
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    # Avoid that Python (pyerrors.h) defines snprintf and vsnprintf
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    if (MSVC AND NOT MSVC_VERSION VERSION_LESS 1900)
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        add_definitions(-DHAVE_SNPRINTF)
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    elseif (MINGW)
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        add_definitions(-DHAVE_SNPRINTF)
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    endif()
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    # Allow developers to use Boost < 1.65
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    if (NOT BOOST_MIN_VERSION)
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        set(BOOST_MIN_VERSION 1.65)
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    endif()
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    # For older cmake versions the variable 'CMAKE_CXX_COMPILER_VERSION' is missing
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    if(CMAKE_COMPILER_IS_GNUCXX AND NOT CMAKE_CXX_COMPILER_VERSION)
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        execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion
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                        OUTPUT_VARIABLE CMAKE_CXX_COMPILER_VERSION)
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    endif(CMAKE_COMPILER_IS_GNUCXX AND NOT CMAKE_CXX_COMPILER_VERSION)
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    # Enabled C++17 for Freecad 0.20 and later
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        set(BUILD_ENABLE_CXX_STD "C++17"  CACHE STRING  "Enable C++ standard")
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        set_property(CACHE BUILD_ENABLE_CXX_STD PROPERTY STRINGS
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                     "C++17"
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                     "C++20"
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        )
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        if (CMAKE_COMPILER_IS_GNUCXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 7.3)
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            message(FATAL_ERROR "FreeCAD 0.20 and later requires C++17.  G++ must be 7.3 or later, the used version is ${CMAKE_CXX_COMPILER_VERSION}")
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        elseif(CMAKE_COMPILER_IS_CLANGXX AND CMAKE_CXX_COMPILER_VERSION VERSION_LESS 6.0)
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            message(FATAL_ERROR "FreeCAD 0.20 and later requires C++17.  Clang must be 6.0 or later, the used version is ${CMAKE_CXX_COMPILER_VERSION}")
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        endif()
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    # Escape the two plus chars as otherwise cmake complains about invalid regex
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    if(${BUILD_ENABLE_CXX_STD} MATCHES "C\\+\\+20")
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        set(CMAKE_CXX_STANDARD 20)
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    elseif(${BUILD_ENABLE_CXX_STD} MATCHES "C\\+\\+17")
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        set(CMAKE_CXX_STANDARD 17)
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    endif()
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    # Log the compiler and version
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    message(STATUS "Compiler: ${CMAKE_CXX_COMPILER_ID}, version: ${CMAKE_CXX_COMPILER_VERSION}")
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    if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGXX)
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        include(${CMAKE_SOURCE_DIR}/cMake/ConfigureChecks.cmake)
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        configure_file(${CMAKE_SOURCE_DIR}/src/config.h.cmake ${CMAKE_CURRENT_BINARY_DIR}/config.h)
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        add_definitions(-DHAVE_CONFIG_H)
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        # For now only set pedantic option for clang
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        if(CMAKE_COMPILER_IS_CLANGXX)
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            set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wpedantic -Wno-write-strings ${CMAKE_CXX_FLAGS}")
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        else()
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            set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-write-strings ${CMAKE_CXX_FLAGS}")
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        endif()
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        include_directories(${CMAKE_CURRENT_BINARY_DIR})
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        # get linker errors as soon as possible and not at runtime e.g. for modules
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        if(BUILD_DYNAMIC_LINK_PYTHON)
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            if(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
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                set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-undefined,error")
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            elseif(UNIX)
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                set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,--no-undefined")
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            endif()
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        else(BUILD_DYNAMIC_LINK_PYTHON)
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            if(CMAKE_COMPILER_IS_CLANGXX)
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                set(CMAKE_SHARED_LINKER_FLAGS "${CMAKE_SHARED_LINKER_FLAGS} -Wl,-undefined,dynamic_lookup")
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            endif()
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        endif(BUILD_DYNAMIC_LINK_PYTHON)
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    endif(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_COMPILER_IS_CLANGXX)
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    if(CMAKE_COMPILER_IS_CLANGXX)
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        # Disable warning about potentially uninstantiated static members
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        # because it leads to a lot of false-positives.
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        #
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        # https://en.wikipedia.org/wiki/Xcode#Latest_versions
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        if (APPLE)
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            if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS 8.0)
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                set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-undefined-var-template")
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            endif()
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            add_definitions(-DGL_SILENCE_DEPRECATION)
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        elseif (UNIX)
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            set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-undefined-var-template")
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        endif()
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        # older boost.preprocessor turn off variadics for clang
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        add_definitions(-DBOOST_PP_VARIADICS=1)
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        message(STATUS "Force BOOST_PP_VARIADICS=1 for clang")
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    endif()
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    set (COMPILE_DEFINITIONS ${COMPILE_DEFINITIONS} BOOST_NO_CXX98_FUNCTION_BASE)
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endmacro(CompilerChecksAndSetups)
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