Going thru a CMake restructure. As part of this many internal dependencies, some of which are QML modules, are being brought in via FetchContent. With Qt6, these QML modules use qt_add_qml_module(). These modules had no issues configuring and building prior to being added thru FetchContent, but now give a CMake configuration warning as shown below:
CMake Warning at C:/Qt/6.2.4/install-dtop32-deb-and-rel/lib/cmake/Qt6Qml/Qt6QmlMacros.cmake:698 (message):
The BCControls target is a QML module with target path BCControls. It uses
an OUTPUT_DIRECTORY of
C:/Projects/build-AEPP-Desktop_Qt_6_2_4_MSVC2019_32bit-Release/_deps/bccontrols-build,
which should end in the same target path, but doesn't. Tooling such as
qmllint may not work correctly.
Call Stack (most recent call first):
C:/Qt/6.2.4/install-dtop32-deb-and-rel/lib/cmake/Qt6Qml/Qt6QmlMacros.cmake:1458 (_qt_internal_target_enable_qmllint)
C:/Qt/6.2.4/install-dtop32-deb-and-rel/lib/cmake/Qt6Qml/Qt6QmlMacros.cmake:564 (qt6_target_qml_sources)
C:/Qt/6.2.4/install-dtop32-deb-and-rel/lib/cmake/Qt6Qml/Qt6QmlMacros.cmake:615 (qt6_add_qml_module)
eSW/Qt/QtCommon/BCControls/CMakeLists.txt:282 (qt_add_qml_module)
In addition, the application that is Fetching dependencies with this warning exhibits a CMake configuration error. In this example BatchExecutor, the executable wanting to link against BCControls, is complaining about a non-existent Qt6::Svg, but BatchExecutor is not itself dependent on that component. Prior to bringing BCControls in using FetchContent, there was no error.
BatchExecutor error:
CMake Error at C:/Qt/6.2.4/install-dtop32-deb-and-rel/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:592 (get_target_property):
get_target_property() called with non-existent target "Qt6::Svg".
Call Stack (most recent call first):
C:/Qt/6.2.4/install-dtop32-deb-and-rel/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:681 (_qt_internal_finalize_executable)
C:/Qt/6.2.4/install-dtop32-deb-and-rel/lib/cmake/Qt6Core/Qt6CoreMacros.cmake:661:EVAL:1 (qt6_finalize_target)
eSW/Qt/Apps/BatchExecutor/CMakeLists.txt:DEFERRED
This error goes away if I add Qt6::Svg on the list of REQUIRED COMPONENTS in the find_package() call.
I’m pasting the relevant sections of the CMakeLists.txt from BCControls followed by that from BatchExecutor. I realize this is as much a Qt CMake integration problem as it is a pure CMake problem, but I know gurus like Craig Scott are here often and he is a domain expert in both as well as being the author of FetchContent, IIRC.
BCControls/CMakeLists.txt (qml module):
project(BCControls)
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Svg Qml LinguistTools REQUIRED)
set(QML_FILES
BCInfoScreen.qml
# omitting many files here
)
set(RESOURCE_FILES
# omitting
)
qt_add_library(BCControls STATIC)
file(GLOB TS_FILES translations/*.ts)
qt_add_translations(BCControls
TS_FILES ${TS_FILES}
QM_FILES_OUTPUT_VARIABLE qmfiles
)
qt_add_qml_module(BCControls
URI "BCControls"
VERSION 1.0
QML_FILES ${QML_FILES}
RESOURCES ${RESOURCE_FILES}
)
qt_add_resources(BCControls "BCControlsTranslations" PREFIX "/translations" FILES ${qmfiles})
# Images in SVG format exist in bccontrols.qrc. Need to
# load Qt${QT_VERSION_MAJOR}::Svg shared library at runtime.
target_link_libraries(BCControls
PRIVATE
Qt${QT_VERSION_MAJOR}::Svg
Qt${QT_VERSION_MAJOR}::Qml
)
BatchExecutor/CMakeLists.txt (app):
find_package(Qt${QT_VERSION_MAJOR} COMPONENTS Core Gui Qml REQUIRED)
set(RESOURCE_FILES
# omitting
)
set(QML_FILES
# omitting many files here
)
set(CPP_FILES
# omitting
)
qt_add_executable(BatchExecutor ${CPP_FILES})
qt_add_qml_module(BatchExecutor
VERSION 1.0
URI "BatchExecutor"
QML_FILES ${QML_FILES}
RESOURCES ${RESOURCE_FILES}
)
FetchContent_Declare(BCControls SOURCE_DIR ${BCControls_LOC})
FetchContent_MakeAvailable(BCControls)
target_include_directories(BatchExecutor PRIVATE .)
target_link_libraries(BatchExecutor
PRIVATE
Qt${QT_VERSION_MAJOR}::Core
Qt${QT_VERSION_MAJOR}::Gui
Qt${QT_VERSION_MAJOR}::Qml
BCControls
)
I’ll cross-post this on the Qt forums.