qt5base-lts/cmake/QtResource.cmake.in

#
# All things resource related
#

function(__qt_get_relative_resource_path_for_file output_alias file)
    get_property(alias SOURCE ${file} PROPERTY QT_RESOURCE_ALIAS)
    if (NOT alias)
        set(alias "${file}")
    endif()
    set(${output_alias} ${alias} PARENT_SCOPE)
endfunction()

function(__qt_propagate_generated_resource target resource_name generated_source_code output_generated_target)
    get_target_property(type ${target} TYPE)
    if(type STREQUAL STATIC_LIBRARY)
        set(resource_target "${target}_resources_${resourceName}")
        add_library("${resource_target}" OBJECT "${generated_source_code}")

        # Use TARGET_NAME genex to map to the correct prefixed target name when it is exported
        # via qt_install(EXPORT), so that the consumers of the target can find the object library
        # as well.
        target_link_libraries(${target} INTERFACE
                              "$<TARGET_OBJECTS:$<TARGET_NAME:${resource_target}>>")
        set(${output_generated_target} "${resource_target}" PARENT_SCOPE)
    else()
        set(${output_generated_target} "" PARENT_SCOPE)
        target_sources(${target} PRIVATE ${generated_source_code})
    endif()
endfunction()


#
# Process resources via file path instead of QRC files. Behind the
# scnenes, it will generate a qrc file and apply post processing steps
# when applicable. (e.g.: QtQuickCompiler)
#
# The QRC Prefix is set via the PREFIX parameter.
#
# Alias settings for files need to be set via the QT_RESOURCE_ALIAS property
# via the set_soure_files_properties() command.
#
# When using this command with static libraries, one or more special targets
# will be generated. Should you wish to perform additional processing on these
# targets pass a value to the OUTPUT_TARGETS parameter.
#
function(QT@PROJECT_VERSION_MAJOR@_PROCESS_RESOURCE target resourceName)

    cmake_parse_arguments(rcc "" "PREFIX;LANG;BASE;OUTPUT_TARGETS" "FILES;OPTIONS" ${ARGN})

    string(REPLACE "/" "_" resourceName ${resourceName})
    string(REPLACE "." "_" resourceName ${resourceName})

    set(output_targets "")
    # Apply base to all files
    if (rcc_BASE)
        foreach(file IN LISTS rcc_FILES)
            set(resource_file "${rcc_BASE}/${file}")
            __qt_get_relative_resource_path_for_file(alias ${resource_file})
            # Handle case where resources were generated from a directory
            # different than the one where the main .pro file resides.
            # Unless otherwise specified, we should use the original file path
            # as alias.
            if (alias STREQUAL resource_file)
                set_source_files_properties(${resource_file} PROPERTIES QT_RESOURCE_ALIAS ${file})
            endif()
            file(TO_CMAKE_PATH ${resource_file} resource_file)
            list(APPEND resource_files ${resource_file})
        endforeach()
    else()
        set(resource_files ${rcc_FILES})
    endif()

    if(NOT rcc_PREFIX)
        get_target_property(rcc_PREFIX ${target} QT_RESOURCE_PREFIX)
        if (NOT rcc_PREFIX)
            message(FATAL_ERROR "QT@PROJECT_VERSION_MAJOR@_PROCESS_RESOURCE() was called without a PREFIX and the target does not provide QT_RESOURCE_PREFIX. Please either add a PREFIX or make the target ${target} provide a default.")
        endif()
    endif()

    # Apply quick compiler pass. This is only enabled when Qt6QmlMacros is
    # parsed.
    if (QT6_ADD_RESOURCE_DECLARATIVE_EXTENSIONS)
        qt6_quick_compiler_process_resources(${target} ${resourceName}
            FILES ${resource_files}
            PREFIX ${rcc_PREFIX}
            OUTPUT_REMAINING_RESOURCES resources
            OUTPUT_RESOURCE_NAME newResourceName
            OUTPUT_GENERATED_TARGET output_target_quick
        )
    else()
        set(newResourceName ${resourceName})
        set(resources ${resource_files})
    endif()

    if (NOT resources)
        if (rcc_OUTPUT_TARGETS)
            set(${rcc_OUTPUT_TARGETS} "${output_target_quick}" PARENT_SCOPE)
        endif()
        return()
    endif()
    list(APPEND output_targets ${output_target_quick})
    set(generatedResourceFile "${CMAKE_CURRENT_BINARY_DIR}/.rcc/generated_${newResourceName}.qrc")
    set(generatedSourceCode "${CMAKE_CURRENT_BINARY_DIR}/.rcc/qrc_${newResourceName}.cpp")

    # Generate .qrc file:

    # <RCC><qresource ...>
    set(qrcContents "<RCC>\n  <qresource")
    if (rcc_PREFIX)
        string(APPEND qrcContents " prefix=\"${rcc_PREFIX}\"")
    endif()
    if (rcc_LANG)
        string(APPEND qrcContents " lang=\"${rcc_LANG}\"")
    endif()
    string(APPEND qrcContents ">\n")

    set(resource_dependencies)
    foreach(file IN LISTS resources)
        __qt_get_relative_resource_path_for_file(file_resource_path ${file})

        if (NOT IS_ABSOLUTE ${file})
            set(file "${CMAKE_CURRENT_SOURCE_DIR}/${file}")
        endif()

        ### FIXME: escape file paths to be XML conform
        # <file ...>...</file>
        string(APPEND qrcContents "    <file alias=\"${file_resource_path}\">")
        string(APPEND qrcContents "${file}</file>\n")
        list(APPEND files "${file}")

        get_source_file_property(target_dependency ${file} QT_RESOURCE_TARGET_DEPENDENCY)
        if (NOT target_dependency)
            list(APPEND resource_dependencies ${file})
        else()
            if (NOT TARGET ${target_dependency})
                message(FATAL_ERROR "Target dependency on resource file ${file} is not a cmake target.")
            endif()
            list(APPEND resource_dependencies ${target_dependency})
        endif()
    endforeach()

    # </qresource></RCC>
    string(APPEND qrcContents "  </qresource>\n</RCC>\n")

    file(GENERATE OUTPUT "${generatedResourceFile}" CONTENT "${qrcContents}")

    set(rccArgs --name "${newResourceName}"
        --output "${generatedSourceCode}" "${generatedResourceFile}")
    if(rcc_OPTIONS)
        list(APPEND rccArgs ${rcc_OPTIONS})
    endif()

    # When cross-building, we use host tools to generate target code. If the host rcc was compiled
    # with zstd support, it expects the target QtCore to be able to decompress zstd compressed
    # content. This might be true with qmake where host tools are built as part of the
    # cross-compiled Qt, but with CMake we build tools separate from the cross-compiled Qt.
    # If the target does not support zstd (feature is disabled), tell rcc not to generate
    # zstd related code.
    if(NOT QT_FEATURE_zstd)
        list(APPEND rccArgs "--no-zstd")
    endif()

    # Process .qrc file:
    add_custom_command(OUTPUT "${generatedSourceCode}"
                       COMMAND "@QT_CMAKE_EXPORT_NAMESPACE@::rcc"
                       ARGS ${rccArgs}
                       DEPENDS
                        ${resource_dependencies}
                        ${generatedResourceFile}
                        "@QT_CMAKE_EXPORT_NAMESPACE@::rcc"
                       COMMENT "RCC ${newResourceName}"
                       VERBATIM)

    get_target_property(type "${target}" TYPE)
    # Only do this if newResourceName is the same as resourceName, since
    # the resource will be chainloaded by the qt quickcompiler
    # qml cache loader
    if(newResourceName STREQUAL resourceName)
        __qt_propagate_generated_resource(${target} ${resourceName} "${generatedSourceCode}" output_target)
        list(APPEND output_targets ${output_target})
    else()
        target_sources(${target} PRIVATE "${generatedSourceCode}")
    endif()
    if (rcc_OUTPUT_TARGETS)
        set(${rcc_OUTPUT_TARGETS} "${output_targets}" PARENT_SCOPE)
    endif()
endfunction()