https://bugs.kde.org/show_bug.cgi?id=526377
Bug ID: 526377
Summary: Build is not reproducible
Classification: Plasma
Product: Plasma Keyboard
Version First unspecified
Reported In:
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
CC: [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/.
plasma-keyboard seems quite close to being reproducible, but to suffer from an
issue similar to https://qt-project.atlassian.net/browse/QTBUG-137440:
potentially 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.
This issue was identified while reproducing the NixOS graphical installation
issue, and is tracked there as https://github.com/NixOS/nixpkgs/issues/566885
STEPS TO REPRODUCE
Build plasma-keyboard in an 'essentially equivalent' environment, but for
example varying the parallelism between '4' and '16'.
OBSERVED RESULT
Different generated code / output.
Specifically, the generated
build/src/styles/.rcc/qmlcache/breezestyle_breeze_style_qml.cpp from
./src/styles/breeze/style.qml is different. For 6.7.5, the expression not
consistently generated is for `aspectRatio at line 57, column 5`.
I'm not familiar enough with QML to go from here to actually figuring out what
might cause the nondeterminism - I'd be happy to test further if you can point
me in the right direction!
EXPECTED RESULT
The same generated code / output
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