Use ECMGenerateExportHeader to manage deprecated API better
Summary:
Allows
- projects linking to KDESu to hide deprecated API up to a given version or silence deprecation warnings after a given version, using
- -DKDESU_DISABLE_DEPRECATED_BEFORE_AND_AT
- -DKDESU_NO_DEPRECATED
- -DKDESU_DEPRECATED_WARNINGS_SINCE
- -DKDESU_NO_DEPRECATED_WARNINGS
or - -DKF_DISABLE_DEPRECATED_BEFORE_AND_AT
- -DKF_NO_DEPRECATED
- -DKF_DEPRECATED_WARNINGS_SINCE
- -DKF_NO_DEPRECATED_WARNINGS
- to build KDESu 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, 5.0.0,
CURRENT.