qt5base-lts/cmake/QtResourceHelpers.cmake

function(qt_internal_add_resource target resourceName)
    # Don't try to add resources when cross compiling, and the target is actually a host target
    # (like a tool).
    qt_is_imported_target("${target}" is_imported)
    if(is_imported)
        return()
    endif()

    qt_parse_all_arguments(arg "qt_add_resource" "" "PREFIX;LANG;BASE" "FILES" ${ARGN})

    _qt_internal_process_resource(${target} ${resourceName}
        PREFIX "${arg_PREFIX}"
        LANG "${arg_LANG}"
        BASE "${arg_BASE}"
        FILES ${arg_FILES}
        OUTPUT_TARGETS out_targets
   )

   if (out_targets)
        qt_install(TARGETS ${out_targets}
            EXPORT "${INSTALL_CMAKE_NAMESPACE}${target}Targets"
            DESTINATION "${INSTALL_LIBDIR}"
        )

        qt_internal_record_rcc_object_files("${target}" "${out_targets}"
                                            INSTALL_LOCATION "${INSTALL_LIBDIR}")
   endif()
endfunction()

function(qt_internal_record_rcc_object_files target resource_targets)
    set(args_optional "")
    set(args_single INSTALL_LOCATION)
    set(args_multi "")

    cmake_parse_arguments(arg
       "${args_optional}"
       "${args_single}"
       "${args_multi}"
       ${ARGN}
    )

    foreach(out_target ${resource_targets})
        get_target_property(resource_name ${out_target} _qt_resource_name)
        if(NOT resource_name)
            continue()
        endif()
        if(QT_WILL_INSTALL)
            # Compute the install location of a resource object file in a prefix build.
            # It's comprised of thee following path parts:
            #
            # part (1) INSTALL_LOCATION.
            #          A usual value is '${INSTALL_LIBDIR}/' for libraries
            #          and '${INSTALL_QMLDIR}/foo/bar/' for qml plugin resources.
            #
            # part (2) the value computed by CMake's computeInstallObjectDir comprised of an
            #          objects-<CONFIG> dir and the target name of the object library.
            #          Example: objects-$<CONFIG>/Gui_resources_qpdf
            #
            # part (3) path to the object file, relative to it's build directory.
            #          Example: .rcc/qrc_qpdf.cpp.o
            #
            # The final path is relative to CMAKE_INSTALL_PREFIX aka $qt_install_prefix.
            #
            # The relative path will be transformed into an absolute path when generating .prl
            # files, by prepending $$[QT_INSTALL_PREFIX]/.
            get_target_property(generated_cpp_file_relative_path
                                ${out_target}
                                _qt_resource_generated_cpp_relative_path)

            set(object_file_name "${generated_cpp_file_relative_path}${CMAKE_CXX_OUTPUT_EXTENSION}")
            qt_path_join(rcc_object_file_path
                "objects-$<CONFIG>" ${out_target} "${object_file_name}")
            if(arg_INSTALL_LOCATION)
                qt_path_join(rcc_object_file_path
                             "${arg_INSTALL_LOCATION}" "${rcc_object_file_path}")
            else()
                message(FATAL_ERROR "No install location given for object files to be installed"
                                    " for the following resource target: '${out_target}'")
            endif()
        else()
            # In a non-prefix build we use the object file paths right away.
            set(rcc_object_file_path $<TARGET_OBJECTS:$<TARGET_NAME:${out_target}>>)
        endif()
        set_property(TARGET ${target} APPEND PROPERTY _qt_rcc_objects "${rcc_object_file_path}")

        # Make sure that the target cpp files are compiled with the regular Qt internal compile
        # flags, needed for building iOS apps with qmake where bitcode is involved.
        target_link_libraries("${out_target}" PRIVATE Qt::PlatformModuleInternal)

        qt_set_common_target_properties(${out_target})
    endforeach()
endfunction()