[Pkg-emacsen-addons] Bug#869509: Bug#869509: dh-elpa: please support tuning which emacs flavors to skip

[Sean Whitton]

Hello again,

On Mon, Jul 24, 2017 at 11:53:34PM -0400, Aaron M. Ucko wrote:
> OK, thanks.  Should dh-elpa then stop byte-compiling anything against
> Emacs 24, if there are already addons that don't support it and Emacs 24
> is on the way out anyway?

David Bremner points out that something like this would result in a
bumpy transition for those upgrading from stretch to buster: they're
likely to retain emacs24 installed, and to suddenly have /all/ addons stop
working would be unnecessarily disruptive.

Our current plan is to add an option like this:

    override_dh_elpa:
    	dh_elpa --min-emacs-version 25

This would make it possible to declare incompatibilities with older
versions of Emacs, avoiding byte-compilation against those, but wouldn't
make it possible to declare incompatibility with the latest version
but compatibility with an older version, which amounts to a bug blocking
the transition.

-- 
Sean Whitton
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