The qt6_add_big_resources command was dysfunctional whenever AUTOMOC was
enabled for a target.
We passed multiple object files with the --temp argument of the second
pass of rcc. We must pass exactly one. The spurious object file was the
one that's created by AUTOMOC. Turn off all of AUTOGEN for the C++
source file that's generated in the first pass of rcc.
Enable AUTOMOC for tests/auto/cmake/test_add_big_resource to cover this
situation.
Pick-to: 6.1
Fixes: QTBUG-85051
Change-Id: I6d2ce4953297db0751913456db0a4a126fe33f14
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
9e8f43e5ac