D28859: Detect QQC2 version at build time with actual detection.

[Xuetian Weng]

xuetianweng created this revision.
xuetianweng added reviewers: Plasma, rizzitello, davidedmundson, apol, mart.
xuetianweng added a project: Plasma.
Herald added a subscriber: plasma-devel.
xuetianweng requested review of this revision.

REVISION SUMMARY
  Whenever qqc release a new version the version need to be updated.
  Otherwise the feature is not available to user. This change tries
  to use real qml code to detect the version by creating object until
  success, force to use a minimal qpa platform when running it.

TEST PLAN
  Run the cmake under a env without display server and version is detected
  correctly.

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28859

AFFECTED FILES
  CMakeLists.txt
  detectqqc2version.qml

To: xuetianweng, #plasma, rizzitello, davidedmundson, apol, mart
Cc: plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, ragreen, ZrenBot, ngraham, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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