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Details

Type: Bug
Resolution: Done
Priority: P2: Important
Fix Version/s: 6.2.0 RC
Affects Version/s: 6.2.0 Beta1
Component/s: Build System: CMake
Labels:
- cmake_upstream

Description

Some Qt builds in CI failed when configured with CMake 3.21.0

Job https://testresults.qt.io/coin/integration/qt/qt5/tasks/web_qt_qt5_1626704027212
https://codereview.qt-project.org/c/qt/qt5/+/360035

There were two failures.

One in an example in qtscxml

https://testresults.qt.io/coin/logview/qt/qtscxml/4c08b44e476d6da2b285f8d698c89f957bada5e5/WindowsWindows_10x86_64WindowsWindows_10x86_64MSVC2019qtci-windows-10-x86_64-52-83a968DebugAndRelease_Sccache/dd8bffa995fe1e0eaa0da84461750df760f5341c/build_1626705926

ninja: error: 'C:/Users/qt/work/qt/qtscxml/examples/scxml/mediaplayer-widgets-static/mediaplayer-widgets-static_autogen/mocs_compilation_Debug.cpp', needed by 'examples/scxml/mediaplayer-widgets-static/CMakeFiles/mediaplayer-widgets-static.dir/Debug/mediaplayer-widgets-static_autogen/mocs_compilation_Debug.cpp.obj', missing and no known rule to make it

another in qttools itself

https://testresults.qt.io/coin/logview/qt/qttools/61f398c77280c146194d33516a5567869e048c06/WindowsWindows_10x86_64WindowsWindows_10x86_64MSVC2019qtci-windows-10-x86_64-52-83a968DebugAndRelease_Sccache/075743c2880ef30a78e9e8db532b2502c5c195db/build_1626705894

ninja: error: 'C:/Users/qt/work/qt/qttools/src/designer/src/lib/Designer_autogen/mocs_compilation_Debug.cpp', needed by 'src/designer/src/lib/CMakeFiles/Designer.dir/Debug/Designer_autogen/mocs_compilation_Debug.cpp.obj', missing and no known rule to make it

The issue needs a bunch of conditions to reproduce.
CMake 3.21.0 + Ninja Multi-Config generator, cross config mode enabled, the project using a .ui file + AUTOUIC + AUTOMOC, the .ui file needs to be in some parent directory relative to the target that includes it.

The issue does not reproduce with CMake 3.20.5.

Attaching minimal repro project.