https://bugs.kde.org/show_bug.cgi?id=442695
Bug ID: 442695
Summary: KWin fails to load necessary QT plugin when built with
LTO
Product: kwin
Version: 5.22.4
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: satt...@pm.me
Target Milestone: ---
SUMMARY
When KWin is compiled with Clang and Full LTO (I don't know if ThinLTO or GCC
doesn't exhibit this issue, I didn't test it), kwin_wayland or any other
attemps to start Plasma will fail with an error message something like this:
"qt.qta.plugin: could not load the Qt platform plugin
"wayland-org.kde.kwin.qpa" in "" even though it was found.
This application failed to start because no Qt platform plugin could be
initialized. reinstalling the application may fix this problem"
This doesn't happen on the exact same machine, with the exact same software
versions, if KWin is built without LTO (other optimizations such as -O3 or
-march doesn't seem to affect this issue at all), it works perfectly.
STEPS TO REPRODUCE
1. Compile KWin with Clang and -flto=full
2. Attempt to start it
3. Watch as it fails to load the required QT Plugin
OBSERVED RESULT
Error message inserted above when starting KWin
EXPECTED RESULT
Kwin starting without errors
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux / KDE 5.22.5
(available in About System)
KDE Plasma Version: 5.22.5
KDE Frameworks Version: 5.86.0
Qt Version: 5.15.2
ADDITIONAL INFORMATION
I selected 5.22.4 on the Component section because there is no option for
5.22.5
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