[Development] Building Qt6 from source

[Felix Crazzolara]

Dear everyone,

I would like to build Qt 6.3.1 from source. Unfortunately, when building
the tests I got the following build error:

[1/367] Running moc --collect-json for target tst_qmlsplitlib
FAILED:
qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/qt6tst_qmlsplitlib_release_metatypes.json.gen
qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/qt6tst_qmlsplitlib_release_metatypes.json
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/qt6tst_qmlsplitlib_release_metatypes.json.gen
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/qt6tst_qmlsplitlib_release_metatypes.json

cd
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib
&&
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtbase/libexec/moc
-o
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/qt6tst_qmlsplitlib_release_metatypes.json.gen
--collect-json
@/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/tst_qmlsplitlib_json_file_list.txt
&& /home/felix/apps/software_tools/bin/cmake -E copy_if_different
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/qt6tst_qmlsplitlib_release_metatypes.json.gen
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib/meta_types/qt6tst_qmlsplitlib_release_metatypes.json
Error opening
/home/felix/git/software_tools/qt-everywhere-src-6.3.1/qtdeclarative/tests/auto/qml/qmlsplitlib/tst_qmlsplitlib_autogen/include/moc_tst_qmlsplitlib_library_tst_qmlsplitlib.cpp.json
for reading
ninja: build stopped: subcommand failed.

My system specs are:
Ubuntu 20.04.4 LTS
cmake version 3.21.3
gcc (GCC) 11.2.0
g++ (GCC) 11.2.0
ninja version: 1.10.2.git.kitware.jobserver-1

I got the sources from the Qt website. I tried to track down why this error
occurs, but wasn't able to do so. Does someone have an idea why this error
occurs? If someone has experience with building Qt 6 on Ubuntu 20 with a
different CMake version or other Qt version, I'd be happy to try that as
well.

Many thanks and best regards,

Felix Crazzolara
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