bug#24553: 25.1; epa ignores epg-gpg-program in very confusing way

[Daiki Ueno]

Nick Helm <nick@tenpoint.co.nz> writes:

>> I need to edit some files that decrypt properly with gpg 1.4 but not gpg
>> 2.1.  I have both installed on my system, with 1.4 as /usr/bin/gpg1 and
>> 2.1 as /usr/bin/gpg2.  The bug is that emacs ignores the epg-gpg-program
>> variable *except* in error messages, which is very confusing.  
>
>> Ideally emacs should obey epg-gpg-program ...
>
> I have a similar problem with epg-gpg-program. See bug#24229
> (https://debbugs.gnu.org/cgi/bugreport.cgi?bug=24229) for some
> discussion that might be relevant.

And I want to close this as a duplicate of that bug.  Is there still
anything we can technically do for this?  Isn't it enough to suggest:

  M-: (custom-set-variables '(epg-gpg-program "gpg1" t))

instead of setq?