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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: Fri, 01 Oct 2010 10:00:31 -0400
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100825 Thunderbird/3.1.3

On 9/30/2010 1:30 PM, Ken Brown wrote:
On 9/30/2010 3:12 AM, Glenn Morris wrote:
Ken Brown wrote:

Did 23.1 have the same problem?

No, it doesn't.  So that changes things completely.  I guess I have to
try a bisection to find the revision between 23.1 and 23.2 where the
bug first appears.  It may be a little while before I have time to do

The first thing you could try is just a straight rebuild of the 23.2
package (if you were testing a pre-built binary). I have a vague
memory of some transient DOC related weirdness with emacs-snapshot
packages that just seemed to go away on its own (?). So maybe it was
just a build glitch.

Thanks for the suggestion.  This is indeed a build glitch, but I don't
understand what's happening yet.  If I unpack the emacs-23.2 source and
just build it (./configure&&  make) the bug is gone.  But normally I
build emacs for Cygwin by using a packaging tool called cygport, which
(among other things) does an out-of-tree build.  I don't know if this is
causing the problem.  My build of emacs-23.1 also used cygport and
didn't exhibit the bug.  So I have to keep investigating.

The out-of-tree build is indeed the problem, and I'm no longer sure this is Cygwin-specific. Here are the steps to reproduce it:

wget http://ftp.gnu.org/pub/gnu/emacs/emacs-23.2.tar.gz
tar -xf emacs-23.2.tar.gz
mkdir build
cd build
cd src
./emacs -Q
M-x help

The result is the error message "Wrong type argument: stringp, nil".

I would appreciate it if someone could try this on another system so that I'll know if it's a Cygwin problem.


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