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bug#7127: 23.2; M-x help throws an error

From: Ken Brown
Subject: bug#7127: 23.2; M-x help throws an error
Date: Wed, 29 Sep 2010 13:00:03 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100915 Thunderbird/3.1.4

On 9/29/2010 9:02 AM, Ken Brown wrote:
On 9/29/2010 3:58 AM, Glenn Morris wrote:

This may be Cygwin-specific?

Aidan Kehoe wrote:

(symbol-function 'help-for-help-internal) (h-f-h-i being what help
eventually resolves to) gives me a compiled function with a nil
documentation slot; help.elc has (defalias 'help-for-help-internal
...) with a compiled function and what seems to be the correct lazy
doc reference. The DOC file seems correct, with an entry
Fhelp-for-help-internal Help command.

But (documentation #'custom-declare-variable-early) and (documentation
#'when) both give nil for me, and the same seems to be true for all the
dumped compiled functions with docstrings. I don’t know why that is, and I
don’t especially care to debug it right now, but this binary is what Cygwin
installed, I’m certain I’m not the only one affected.

   >   >   In GNU Emacs 23.2.1 (i686-pc-cygwin, GTK+ Version 2.18.6)
   >   >    of 2010-05-08 on laptop

I can reproduce the problem on my (Cygwin) system.  The bug occurs in
Emacs 23.2 as well as a build from the current emacs-23 branch.  But the
bug is gone in a build from the trunk.  I wonder if the patch in
bug#6715 is what fixed it.  At a glance, I don't see anything else
Cygwin-specific that might be relevant.  When I get a chance, I'll see
if back-porting that patch to emacs-23 fixes the problem.

This turns out not to be so easy. That patch is intertwined with a lot of changes to the build system that were made only in the trunk, so there's no way to quickly test whether that patch is relevant to the present bug. Since the bug is gone in the trunk, I don't think it's worth putting a lot of effort into fixing it in the emacs-23 branch.


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