bug#62762: 'make' often errors with "Org version mismatch" after pulling a new version of the code

[Eli Zaretskii]

> Date: Fri, 24 Nov 2023 20:56:31 +0200
> Cc: yantar92@posteo.net, monnier@iro.umontreal.ca, bzg@gnu.org,
>  62762@debbugs.gnu.org, kyle@kyleam.com
> From: Dmitry Gutov <dmitry@gutov.dev>
> 
> On 24/11/2023 20:54, Eli Zaretskii wrote:
> >> Date: Fri, 24 Nov 2023 19:43:53 +0200
> >> Cc:monnier@iro.umontreal.ca,bzg@gnu.org,62762@debbugs.gnu.org,
> >>   Kyle Meyer<kyle@kyleam.com>
> >> From: Dmitry Gutov<dmitry@gutov.dev>
> >>
> >> I still see the "Org version mismatch" error fairly often when
> >> rebuilding Emacs (after which I have to invoke 'touch lisp/org/...'
> >> again), or when trying to use org-mode in an already-built Emacs. All of
> >> that with the master branch.
> > That's because the version test was not removed, just suppressed in
> > the most frequent situations during the build.  But when Org files
> > need to be actually loaded (e.g., to generate a manual out of some
> > foo.org source), the test will kick in and will abort the command.
> > 
> > The only way to avoid that is to redesign and reimplement the solution
> > for version mismatch in Org macros.
> 
> I thought the idea was to skip the version check at least when the Org 
> version is built-in?

AFAIU, this is impossible, as long as Org uses macros that can change
in incompatible ways, and as long as the decision of Org developers is
in effect to force recompilation each time they bump the version, so
as to avoid weird problems due to changes in macros.

The change we installed in the Emacs build procedure simply delays the
error until Org is actually used (as opposed to just being compiled as
part of the build update).