D10732: Help automoc to find metadata JSON files referenced in the code

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added reviewers: Frameworks, Build System, apol.
Restricted Application added a project: Frameworks.
kossebau requested review of this revision.

REVISION SUMMARY
  automoc by itself can only detect metadata files referenced by direct
  usage of the Q_PLUGIN_METADATA macro. It does not do any C++ preprocessor
  evaluation. Instead it needs to be helped with regexp-based filter rules
  for detecting any names of files used as additional moc input.
  See docs for AUTOMOC_DEPEND_FILTERS for further details.
  
  In the near future all the boilerplate code should be replaced with a yet to
  be designed ECM macro. For now explicit code is used to collect use cases
  for the macro and still to fix the issue already.

TEST PLAN
  Changing a JSON file (or for those generated from .desktop files
  changing that one) and running make results in the related *.moc file
  being regenerated and the related object file being recompiled.
  qtplugininfo shows that the created plugin binary has up-to-date JSON
  content.

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  useCMAKE_AUTOMOC_DEPEND_FILTERS

REVISION DETAIL
  https://phabricator.kde.org/D10732

AFFECTED FILES
  CMakeLists.txt
  KF5PlasmaConfig.cmake.in

To: kossebau, #frameworks, #build_system, apol
Cc: michaelh
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