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Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: None
Affects Version/s: 6.2.0 Beta2
Component/s: Build System: CMake
Labels:
None
Environment:
Xcode 12.4

Platform/s:

iOS/tvOS/watchOS, macOS

A sample cmake project with an executable and a qml module can be found in a qtdeclarative test.

After removing the version from the find_package call to avoid an unrelated error, it fails as shown below:

$ qt-cmake ../../../worktrees/dev/qtdeclarative/tests/auto/cmake/qtquickcompiler -GXcode

-- Configuring done
-- Generating done
CMake Error in CMakeLists.txt:
  The custom command generating

    /Volumes/T3/Dev/qt/qt5_cmake/builds/dev-ios-simulator-super/qmltestapp_cmake/meta_types/qt6qqc_test_metatypes.json.gen

  is attached to multiple targets:

    qqc_test
    qqc_test_qmltyperegistration

  but none of these is a common dependency of the other(s).  This is not
  allowed by the Xcode "new build system".

After a few reconfigurations it fails with a different referenced file.

CMake Error in CMakeLists.txt:
  The custom command generating

    /Volumes/T3/Dev/qt/qt5_cmake/builds/dev-ios-simulator-super/qmltestapp_cmake/qqc_test_qmltyperegistrations.cpp

  is attached to multiple targets:

    qqc_test
    qqc_test_qmltyperegistration

  but none of these is a common dependency of the other(s).  This is not
  allowed by the Xcode "new build system".

It only fails with the Xcode generator. It configures find with Ninja, but of course the app is not launchable anymore.

is required for

QTBUG-95838 Improve experience of building iOS projects with CMake