GNU bug report logs - #72788
30.0.50; multisession--ensure-db: Symbol’s function definition is void: sqlite-open [2 times]

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Message #29 received at 72788 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 72788 <at> debbugs.gnu.org, Jean Louis <bugs <at> gnu.support>
Subject: Re: bug#72788: 30.0.50; multisession--ensure-db: Symbol’s function
 definition is void: sqlite-open [2 times]
Date: Sat, 31 Aug 2024 10:09:05 -0400

> Stefan, do we have a way of causing the cl-defmethod dispatch reject a
> method due to a failed predicate?  The relevant method of
> multisession.el says:
>
>   (cl-defmethod multisession-backend-value ((_type (eql 'sqlite)) object)
>
> How can I modify this (or its callers?) to make this implementation be
> called only if sqlite-available-p returns non-nil?

AFAIK, the standard way to do that is:

    (cl-defmethod multisession-backend-value ((_type (eql 'sqlite)) object)
      (if (not (sqlite-available-p))
          (cl-call-next-method)
        ...do the usual thing...))

> Btw, it looks like it's okay to have cl-defmethod without a
> cl-defgeneric for the same method?  Is that expected?

Yes.  It's a bit like having a `setq` on a global var without
a matching `defvar`.


        Stefan

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