qt_find_package marks package as not found but has found it?

qtSucks

Hi,
hopefully someone can help me with this one.

in a cmakelits.cmake there is

set(wayland_libs
    Wayland::Client
    Wayland::Server
    Wayland::Cursor
    Wayland::Egl
)

foreach(lib IN LISTS wayland_libs)
    if(TARGET ${lib})
        qt_internal_disable_find_package_global_promotion(${lib})
    endif()
endforeach()

qt_find_package(Wayland 1.15 PROVIDED_TARGETS ${wayland_libs})

when I run my configure command I append --debug-find to get debug info and send to a log file. In that log file I have.

CMake Debug Log at qtbase/cmake/QtFindPackageHelpers.cmake:141 (find_package):
  find_package considered the following paths for FindWayland.cmake:

    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/qtwayland/../cmake/FindWayland.cmake
    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/qtwayland/cmake/FindWayland.cmake
    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/qtbase/cmake/FindWayland.cmake
    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qtpi-build/qtbase/lib/cmake/Qt6BuildInternals/../Qt6/FindWayland.cmake
    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/qtbase/cmake/platforms/FindWayland.cmake
    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/cmake/FindWayland.cmake
    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/qtbase/cmake/FindWayland.cmake
    /usr/share/cmake-3.28/Modules/FindWayland.cmake

  The file was found at

    /home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/qtbase/cmake/3rdparty/extra-cmake-modules/find-modules/FindWayland.cmake

  The module is considered not found due to Wayland_FOUND being FALSE.
Call Stack (most recent call first):
  qtwayland/src/CMakeLists.txt:23 (qt_find_package)

So why does it say it has found the package, then state wayland_found is set to false?

When I look at
/home/tommy/projects/rPi4_OS/crossCompile/qt6/qt5ReproQt6CodeAndBuild/qt5/qtbase/cmake/3rdparty/extra-cmake-modules/find-modules/FindWayland.cmake

it has

find_package_handle_standard_args(Wayland
    FOUND_VAR
        Wayland_FOUND
    REQUIRED_VARS
        Wayland_LIBRARIES
    VERSION_VAR
        Wayland_VERSION
    HANDLE_COMPONENTS
)

but no where can I find what Wayland_LIBRARIES is

grep -iInr *Wayland_LIBRARIES* ../

Paul Colby

Hi @qtSucks,

So why does it say it has found the package, then state wayland_found is set to false?

It doesn't say it has found the package, it says it has found the Find Module. They way CMake find_package works is like so:

when you request a package, CMake looks for a Find Module.
once found, CMake executes the Find Module to locate the actual package.
the Find Module sets variables (eg Wayland_FOUND) to indicate if Find Module found the package you're looking for (and where the libs are, etc).

So here:

find_package considered the following paths for FindWayland.cmake:
...
The file was found at
...

CMake is telling that the it found a Find Module at that location. CMake then should have evaluated the module, and that module reported that it can't find one or more of the libs you requested (ie set Wayland_FOUND to false).

It might help if you show the output that came after your snippet above.

Cheers.