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Autogen: Deprecate CMAKE_AUTOMOC_RELAXED_MODE

Sebastian Holtermann requested to merge sebholt/cmake:cmake_automoc_relaxed_mode_deprecation into master

CMAKE_AUTOMOC_RELAXED_MODE was added for backwards compatibility with KDE 4, which had its last release in 2014. It does not offer additional features but complicates the AUTOMOC code and dependency computation considerably.

Projects that use CMAKE_AUTOMOC_RELAXED_MODE functionality always got extensive warnings during builds and tips on how to convert to regular mode, which is trivial (see commit e474dcb2, CMake 2.8.7).

It's time to consider this feature deprecated and issue a warning at configuration time as well.

This

  • does not remove support for CMAKE_AUTOMOC_RELAXED_MODE, but
  • adds a configuration time deprecation AUTHOR_WARNING for CMAKE_AUTOMOC_RELAXED_MODE.

The final support removal might happen in CMake 3.16 or later.

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