D23789: Add ECMGenerateExportHeaders, for improved handling of deprecated API

[David Faure]

dfaure added inline comments.

INLINE COMMENTS

> ECMGenerateExportHeader.cmake:269
> +# cannot be used to reactivate the declaration, and ``Foo::doWhat`` will not
> +# have been built into the library binary.
> +#

Really? Isn't doWhat excluded only if EXCLUDE_DEPRECATED_BEFORE_AND_AT is set to 5.12.0?
With 5.0.0 it's still available, no?

I'm also surprised this paragraph talks about doWhat but not doBar, they both get disabled together, right?

> ECMGenerateExportHeader.cmake:276
> +# to the version before and at which all deprecated API has been excluded from
> +# the build,
> +# Even more when building against other libraries from the same group "Bar" and

comma followed by uppercase letter is unusual grammar

REPOSITORY
  R240 Extra CMake Modules

REVISION DETAIL
  https://phabricator.kde.org/D23789

To: kossebau, #frameworks, #build_system
Cc: chehrlic, dfaure, cgiboudeaux, kde-frameworks-devel, kde-buildsystem, LeGast00n, GB_2, bencreasy, michaelh, ngraham, bruns
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