Upstream CMake has a nasty bug where AUTOGEN dependencies are
discarded if a library is added as a dependency more than once (or
rather the number of times it is added is not equal to the number of
configured build configs).
This can result in racy build failures, where a <module>_autogen
target is supposed to depend on some <other_module>_sync_headers
target, but doesn't, and thus moc generates empty metatypes files
because it can't find a synced header.
To avoid the AUTOGEN dependencies from being discarded, manually
add all dependencies passed to qt_internal_extend_target to the
AUTOGEN_TARGET_DEPENDS property.
The issue is fixed in CMake 4.0, so the workaround is gated on the
cmake version used. Add a flag called
QT_NO_AUTOGEN_DISCARDED_DEPENDENCIES_WORKAROUND to disable the
workaround, in case the fix gets reverted upstream.
Pick-to: 6.5
Fixes: QTBUG-133725
Change-Id: I857d7e774fc9f9f5203a58311daea5e7177e0d67
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
(cherry picked from commit fcb20586316aff2ccc39e2ae840b79f8b0e904a7)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit 71130a16f8bd9636ac5dcf601d70420011960f5c)
da3068fbfd