ci: error: one or more PCH files were found, but they were invalid #28365
Description
This has been reported by multiple contributors. I assume some sort of caching issue? Seems to happen intermittently. https://cirrus-ci.com/task/5028170181640192?logs=ci#L2664:
make[4]: Entering directory '/ci_container_base/depends/work/build/i686-pc-linux-gnu/qt/5.15.5-ba80ab1130c/qtbase/src/testlib'
make[5]: Entering directory '/ci_container_base/depends/work/build/i686-pc-linux-gnu/qt/5.15.5-ba80ab1130c/qtbase/src/plugins/platforminputcontexts'
make[5]: Entering directory '/ci_container_base/depends/work/build/i686-pc-linux-gnu/qt/5.15.5-ba80ab1130c/qtbase/src/plugins/platforms'
cc1plus: error: one or more PCH files were found, but they were invalid
cc1plus: error: use -Winvalid-pch for more information
cc1plus: error: one or more PCH files were found, but they were invalid
cc1plus: error: use -Winvalid-pch for more information
cc1plus: fatal error: .pch/Qt5Test: No such file or directory
cc1plus: fatal error: .pch/Qt5Test: No such file or directory
compilation terminated.
compilation terminated.
cc1plus: error: one or more PCH files were found, but they were invalid
cc1plus: error: use -Winvalid-pch for more information
cc1plus: fatal error: .pch/Qt5Test: No such file or directory
compilation terminated.
cc1plus: error: one or more PCH files were found, but they were invalid
cc1plus: error: use -Winvalid-pch for more information
make[4]: *** [Makefile:2113: .obj/qtestcase.o] Error 1
make[4]: *** Waiting for unfinished jobs....
make[4]: *** [Makefile:2292: .obj/qtestlog.o] Error 1
make[4]: *** [Makefile:2435: .obj/qtesttable.o] Error 1
cc1plus: fatal error: .pch/Qt5Test: No such file or directory
compilation terminated.
make[5]: Entering directory '/ci_container_base/depends/work/build/i686-pc-linux-gnu/qt/5.15.5-ba80ab1130c/qtbase/src/plugins/platformthemes'
make[4]: *** [Makefile:2578: .obj/qtestdata.o] Error 1
cc1plus: error: one or more PCH files were found, but they were invalid
cc1plus: error: use -Winvalid-pch for more information
cc1plus: fatal error: .pch/Qt5Test: No such file or directory
compilation terminated.
make[4]: *** [Makefile:2944: .obj/qtestresult.o] Error 1
make[4]: Leaving directory '/ci_container_base/depends/work/build/i686-pc-linux-gnu/qt/5.15.5-ba80ab1130c/qtbase/src/testlib'
make[3]: *** [Makefile:298: sub-testlib-make_first] Error 2
make[3]: *** Waiting for unfinished jobs....Not sure why Qt is even trying to use pch on a Linux build, as it was meant to be disabled by #20520.