#
# Usage
#  precompiled_headers(Prefix SOURCE_FILES)
#
macro(precompiled_headers Target PrecompiledHeaderBase Sources)

    if (GEN_MSVC)

        # we will activate "use precompiled headers" flag for every other CPP file in the project
        foreach(SRC IN LISTS ${Sources})
            set_source_files_properties(${SRC}
                PROPERTIES
                COMPILE_FLAGS "/Yu${PrecompiledHeaderBase}.h"
            )
        endforeach()

        # we will set  "create precompiled header" file for the precompiled header cpp file
        set_source_files_properties(${PrecompiledHeaderBase}.cpp
            PROPERTIES
            COMPILE_FLAGS "/Yc${PrecompiledHeaderBase}.h"
        )

    elseif (GEN_XCODE)

         file(GLOB PREFIX_FILE "${PrecompiledHeaderBase}.h")
         set_property(TARGET ${Target} PROPERTY XCODE_ATTRIBUTE_GCC_PREFIX_HEADER ${PREFIX_FILE})
         set_property(TARGET ${Target} PROPERTY XCODE_ATTRIBUTE_GCC_PRECOMPILE_PREFIX_HEADER YES)

    endif()

endmacro()