https://bugs.kde.org/show_bug.cgi?id=512867
Bug ID: 512867
Summary: Build is not reproducible
Classification: Applications
Product: systemsettings
Version First 6.5.3
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: kcm_powerdevil
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Target Milestone: ---
SUMMARY
Ideally, building the project twice on equivalent systems should result in the
same bit-by-bit result. This helps verify there's been no compromise of build
systems, especially when the project is part of a larger aggregate. You can
read more about this at https://reproducible-builds.org/.
powerdevil seems quite close to being reproducible, but to suffer from an issue
similar to https://qt-project.atlassian.net/browse/QTBUG-137440: a missing
explicit library dependency in the CMakeLists.txt of a project using qml leads
to a nondeterminism in what code is generated for it.
In this case, I've observed a nondeterminism building version 6.5.3, in the
generation of the code for ./applets/brightness/main.qml on lines :108 and
:172, which have correspond to "Connections { target:
screenBrightnessControl.displays }" and "Connections { target:
screenBrightnessControl }". I'm not familiar enough with QML to go from here to
determining what dependency might be missing, though - I'd love your assistance
with that!
This issue was identified while reproducing the NixOS graphical installation
issue, and is tracked there as https://github.com/NixOS/nixpkgs/issues/467100
STEPS TO REPRODUCE
Build powerdevil twice on "essentially the same" environment, perhaps varying
the parallelism of the build (I pretty consistently get differences between
running with 2 and with 16 cores)
OBSERVED RESULT
Different generated code / output
EXPECTED RESULT
The same generated code / output
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