[QTBUG-69340] Second run of an application regenerates some qmlc files - Qt Bug Tracker

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Details

Type: Bug
Status: Closed
Priority: P2: Important
Resolution: Done
Affects Version/s: 5.11, 5.12.1
Fix Version/s: 5.12.2, 5.12.3, 5.13.1, 5.14.0 Alpha
Component/s: QML: Declarative and Javascript Engine
Labels:
- earmarked_by_ulf

Description

Qt Creator's QML Profiler has a QML-based UI which is loaded when Qt Creator starts.
The first time the application launches, 22 .qmlc files are generated in the cache directory. On the second launch, 13 .qmlc files get regenerated/modified. The first and second versions have the same file name and file size, only a small difference...

The third and further launches of Qt Creator do not write/modify any qmlc files.
The first and second launches were done with clean settings pathes:

bin\qtcreator.exe -noload all -load QmlProfiler -settingspath c:\temp\cleanpath1
bin\qtcreator.exe -noload all -load QmlProfiler -settingspath c:\temp\cleanpath2

These are the concrete files which get written

First run:
  qrc:/tracing/TimelineText.qml
  qrc:/tracing/Detail.qml
  qrc:/tracing/ImageToolButton.qml
  qrc:/tracing/RangeDetails.qml
  qrc:/tracing/TimeDisplay.qml
  qrc:/tracing/RangeMover.qml
  qrc:/tracing/SelectionRange.qml
  qrc:/tracing/TimelineRulers.qml
  qrc:/tracing/RowLabel.qml
  qrc:/tracing/CategoryLabel.qml
  qrc:/tracing/TimeMarks.qml
  qrc:/tracing/TimelineLabels.qml
  qrc:/tracing/ButtonsBar.qml
  qrc:/tracing/TimelineContent.qml
  qrc:/tracing/SelectionRangeDetails.qml
  qrc:/tracing/Overview.qml
  qrc:/tracing/MainView.qml
  qrc:/tracing/ImageToolButton.qml
  qrc:/tracing/RangeDetails.qml
  qrc:/tracing/FlameGraphDelegate.qml
  qrc:/tracing/FlameGraphView.qml
  qrc:/qmlprofiler/QmlProfilerFlameGraphView.qml

Second runs:
  qrc:/tracing/ButtonsBar.qml
  qrc:/tracing/TimelineContent.qml
  qrc:/tracing/SelectionRangeDetails.qml
  qrc:/tracing/TimeDisplay.qml
  qrc:/tracing/Overview.qml
  qrc:/tracing/TimelineRulers.qml
  qrc:/tracing/TimeMarks.qml
  qrc:/tracing/RowLabel.qml
  qrc:/tracing/CategoryLabel.qml
  qrc:/tracing/TimelineLabels.qml
  qrc:/tracing/MainView.qml
  qrc:/tracing/FlameGraphView.qml
  qrc:/qmlprofiler/QmlProfilerFlameGraphView.qml

I attached the two versions of the cache directory as qmlc_caches.zip.