bug#12548: 24.2.50; Eager macro-expansion skipped due to cycle

[Eli Zaretskii <eliz@gnu.org>]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: 12548@debbugs.gnu.org
> Date: Mon, 01 Oct 2012 11:13:04 -0400
> 
> > Since about 2 weeks ago, I see these warning messages while
> > bootstrapping on MS-Windows, when Lisp files are being byte-compiled.
> 
> Hmm.. you should have seen them since when I introduced the
> eager-macroexpansion, which is a bit more than 2 weeks.

What can I say? I don't bootstrap too often ;-)

> >   Warning: Eager macro-expansion skipped due to cycle:
> >     Γאª => (load "erc-backend.el") => (macroexpand-all (defun erc-server-connect Γאª)) => (macroexpand (erc-log Γאª)) => (load "erc.el") => (load "erc-backend.el")
> 
> [ Not sure what this Γאª is about, but I'll assume it's some incorrect
>   encoding of … ]

Most probably.  The Windows console is notorious for screwing up
non-ASCII characters, since the encoding used by GUI applications and
by console programs is different.

> > AFAICS, all of these messages are related either to loading tramp.el
> > or erc-backend.el.  But I may have missed others, not sure.
> 
> Yes, IIRC there are two such problematic cycles, one with Tramp and
> another with ERC (there were a couple more, but I fixed them).
> I'm not completely sure how best to fix them, so I preferred to leave
> them in and wait for the ERC and Tramp maintainers to fix them later.
> They're harmless in the sense that the resulting .elc files should be
> correct (and probably even identical).
> 
> I think the warning prints a clear and concise description of the cycle,
> so it should not be too hard for the maintainers of those packages to
> understand the problem and decide how best to fix it.
> 
> > and its subroutines.  I never saw anything similar in "regular" byte
> > compilation after updating from the master repository, FWIW.
> 
> A bootstrap under GNU/Linux shows those same warnings.

Thanks for the info.