D24599: Use ECMGenerateExportHeader to manage deprecated API better

[Friedrich W. H. Kossebau]

kossebau created this revision.
kossebau added a reviewer: Frameworks.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
kossebau requested review of this revision.

REVISION SUMMARY
  Allows
  
  - projects linking to KCodecs to hide deprecated API up to a given version or silence deprecation warnings after a given version, using
    - -DKCODECS_DISABLE_DEPRECATED_BEFORE_AND_AT
    - -DKCODECS_NO_DEPRECATED
    - -DKCODECS_DEPRECATED_WARNINGS_SINCE
    - -DKCODECS_NO_DEPRECATED_WARNINGS
  
      or
    - -DKF_DISABLE_DEPRECATED_BEFORE_AND_AT
    - -DKF_NO_DEPRECATED
    - -DKF_DEPRECATED_WARNINGS_SINCE
    - -DKF_NO_DEPRECATED_WARNINGS
  - to build KCodecs optionally with deprecated API excluded from the build, using "EXCLUDE_DEPRECATED_BEFORE_AND_AT" cmake argument.

TEST PLAN
  Builds with EXCLUDE_DEPRECATED_BEFORE_AND_AT set to 0, 5.5.0, 5.56.0,
  CURRENT.

REPOSITORY
  R270 KCodecs

BRANCH
  useECMGenerateExportHeader

REVISION DETAIL
  https://phabricator.kde.org/D24599

AFFECTED FILES
  CMakeLists.txt
  src/CMakeLists.txt
  src/kcodecs.cpp
  src/kcodecs.h

To: kossebau, #frameworks
Cc: kde-frameworks-devel, LeGast00n, GB_2, michaelh, ngraham, bruns
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