# Set common variables and create some interface-only library targets
# that some or all other targets will link to, either directly or transitively,
# to consume common compile options/definitions

macro(qbt_common_config)

    # treat value specified by the CXX_STANDARD target property as a requirement by default
    set(CMAKE_CXX_STANDARD_REQUIRED ON)

    add_library(qbt_common_cfg INTERFACE)

    # Full C++ 17 support is required
    # See also https://cmake.org/cmake/help/latest/prop_gbl/CMAKE_CXX_KNOWN_FEATURES.html
    # for a breakdown of the features that CMake recognizes for each C++ standard
    target_compile_features(qbt_common_cfg INTERFACE
        cxx_std_17
    )

    target_compile_definitions(qbt_common_cfg INTERFACE
        QT_DEPRECATED_WARNINGS
        QT_NO_CAST_TO_ASCII
        QT_NO_CAST_FROM_BYTEARRAY
        QT_USE_QSTRINGBUILDER
        QT_STRICT_ITERATORS
        $<$<NOT:$<CONFIG:Debug>>:QT_NO_DEBUG_OUTPUT>
    )

    if (CMAKE_SYSTEM_NAME STREQUAL "Windows")
        target_compile_definitions(qbt_common_cfg INTERFACE
            NTDDI_VERSION=0x06010000
            _WIN32_WINNT=0x0601
            _WIN32_IE=0x0601
            WIN32_LEAN_AND_MEAN
            NOMINMAX
            UNICODE
            _UNICODE
        )
    endif()

    if ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") OR (CMAKE_CXX_COMPILER_ID STREQUAL "Clang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"))
        target_compile_options(qbt_common_cfg INTERFACE
            -Wall
            -Wextra
            -Wcast-qual
            -Wcast-align
            -Winvalid-pch
            -Woverloaded-virtual
            -Wold-style-cast
            -Wnon-virtual-dtor
            -pedantic
            -pedantic-errors
        )

        # Clang 11 still doesn't support -Wstrict-null-sentinel
        include(CheckCXXCompilerFlag)
        check_cxx_compiler_flag(-Wstrict-null-sentinel SNS_SUPPORT)
        if (SNS_SUPPORT)
            target_compile_options(qbt_common_cfg INTERFACE -Wstrict-null-sentinel)
        endif()
    endif()

    if ((CMAKE_CXX_COMPILER_ID STREQUAL "Clang") OR (CMAKE_CXX_COMPILER_ID STREQUAL "AppleClang"))
        target_compile_options(qbt_common_cfg INTERFACE
            -Wno-range-loop-analysis
        )
    endif()

    if (MINGW)
        target_link_options(qbt_common_cfg INTERFACE $<$<OR:$<CONFIG:Debug>,$<CONFIG:RelWithDebInfo>>:LINKER:--dynamicbase>)
    endif()

    if (MSVC_RUNTIME_DYNAMIC)
        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>DLL")
    else()
        set(CMAKE_MSVC_RUNTIME_LIBRARY "MultiThreaded$<$<CONFIG:Debug>:Debug>")
    endif()

    if (MSVC)
        target_compile_options(qbt_common_cfg INTERFACE
            /guard:cf
            /utf-8
            # https://devblogs.microsoft.com/cppblog/msvc-now-correctly-reports-__cplusplus/
            /Zc:__cplusplus
        )
        target_link_options(qbt_common_cfg INTERFACE
            /guard:cf
            $<$<NOT:$<CONFIG:Debug>>:/OPT:REF /OPT:ICF>
            # suppress linking warning due to /INCREMENTAL and /OPT:ICF being both ON
            $<$<CONFIG:RelWithDebInfo>:/INCREMENTAL:NO>
        )
    endif()

endmacro(qbt_common_config)