# detect the OS
if(${CMAKE_SYSTEM_NAME} MATCHES "Windows")
    set(SFML_OS_WINDOWS 1)
elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
    set(SFML_OS_LINUX 1)
elseif(${CMAKE_SYSTEM_NAME} MATCHES "FreeBSD")
    set(SFML_OS_FREEBSD 1)
elseif(${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
    set(SFML_OS_MACOSX 1)
else()
    message(FATAL_ERROR "Unsupported operating system")
    return()
endif()

# set pkgconfig install directory
# this could be e.g. macports on mac or msys2 on windows etc.
set(CSFML_PKGCONFIG_DIR "${CMAKE_INSTALL_LIBDIR}/pkgconfig")

if(SFML_OS_FREEBSD OR SFML_OS_OPENBSD OR SFML_OS_NETBSD)
    set(CSFML_PKGCONFIG_DIR "libdata/pkgconfig")
endif()

# detect the compiler and its version
# Note: The detection is order is important because:
# - Visual Studio can both use MSVC and Clang
# - GNUCXX can still be set on macOS when using Clang
if(MSVC)
    set(SFML_COMPILER_MSVC 1)

    if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
        set(SFML_COMPILER_CLANG_CL 1)
    endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
    set(SFML_COMPILER_CLANG 1)
elseif(CMAKE_COMPILER_IS_GNUCXX)
    set(SFML_COMPILER_GCC 1)

    execute_process(COMMAND "${CMAKE_CXX_COMPILER}" "--version" OUTPUT_VARIABLE GCC_COMPILER_VERSION)
    string(REGEX MATCHALL ".*(tdm[64]*-[1-9]).*" SFML_COMPILER_GCC_TDM "${GCC_COMPILER_VERSION}")
else()
    message(WARNING "Unsupported compiler")
    return()
endif()

# define the install directory for miscellaneous files
if(SFML_OS_WINDOWS)
    set(INSTALL_MISC_DIR .)
elseif(SFML_OS_LINUX OR SFML_OS_FREEBSD OR SFML_OS_MACOSX)
    set(INSTALL_MISC_DIR share/CSFML)
endif()