GNU bug report logs - #942
NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll

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Message #5 received at submit <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Joshua S." <viking_r <at> george24.com>
To: emacs-pretest-bug <at> gnu.org
Subject: NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll
Date: Tue, 09 Sep 2008 19:19:06 +0900

Xpm enabled NTEmacs hangs if your %PATH% includes cygwin\usr\X11R6\bin.
LoadLibrary("libxpm.dll") never returns in w32_delayed_load() in 
src/image.c.

Since the most cygwin DLLs are not meant to be loaded by non-cygwin apps 
(if you do, they hang),
I suggest we simply remove "libxpm.dll" and "libXpm-nox4.dll" from 
image-library-alist.
(AFAIK Emacs on Cygwin does not use this variable.)

Index: lisp/term/w32-win.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/term/w32-win.el,v
retrieving revision 1.105
diff -u -d -w -r1.105 w32-win.el
--- lisp/term/w32-win.el    11 Aug 2008 01:23:07 -0000    1.105
+++ lisp/term/w32-win.el    9 Sep 2008 10:03:39 -0000
@@ -199,7 +199,7 @@

 ;;; Set default known names for image libraries
 (setq image-library-alist
-      '((xpm "libxpm.dll" "xpm4.dll" "libXpm-nox4.dll")
+      '((xpm "xpm4.dll")
         (png "libpng12d.dll" "libpng12.dll" "libpng.dll"
      ;; these are libpng 1.2.8 from GTK+
      "libpng13d.dll" "libpng13.dll")

Message #10 received at 942 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: "Joshua S." <viking_r <at> george24.com>, 942 <at> debbugs.gnu.org
Subject: Re: bug#942: NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll
Date: Tue, 9 Sep 2008 12:59:36 +0200

On Tue, Sep 9, 2008 at 12:19, Joshua S. <viking_r <at> george24.com> wrote:

> Xpm enabled NTEmacs hangs if your %PATH% includes cygwin\usr\X11R6\bin.

It is better not to have a cygwin binary directory in Emacs' PATH. If
you don't want to mess the system or user PATH variables for Emacs,
you can define your own PATH variable as a value in the registry (in
key HKLM\Software\GNU\Emacs), and Emacs (the Windows port, at least)
will obey it.

> Since the most cygwin DLLs are not meant to be loaded by non-cygwin apps (if
> you do, they hang),
> I suggest we simply remove "libxpm.dll" and "libXpm-nox4.dll" from
> image-library-alist.

libxpm.dll and libxpm-nox4.dll are not "cygwin DLLs". There are
MinGW-compiled versions of both.

You can also modify `image-library-alist' in your path. There's no
need to change the default value.

  Juanma

Message #15 received at 942 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: "Joshua S." <viking_r <at> george24.com>, 942 <at> debbugs.gnu.org
Subject: Re: bug#942: NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll
Date: Tue, 9 Sep 2008 13:00:46 +0200

> You can also modify `image-library-alist' in your path. There's no

s/path/.emacs/

 Juanma

Message #20 received at 942 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Joshua S." <viking_r <at> george24.com>
To: 942 <at> debbugs.gnu.org
Subject: Re: bug#942: NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll
Date: Tue, 09 Sep 2008 20:58:24 +0900

Thanks.

> It is better not to have a cygwin binary directory in Emacs' PATH.

It may need a special notice about this when you distribute xpm-enabled 
NTEmacs binaries.
I know a few users who get into this trouble.

>>  You can also modify `image-library-alist' in your path. There's no

>  s/path/.emacs/

This does not work when I do "make bootstrap".

I will do the registry thing. Thank you for information.

Message #25 received at 942 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Joshua S." <viking_r <at> george24.com>
To: 942 <at> debbugs.gnu.org
Subject: Re: bug#942: NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll
Date: Tue, 09 Sep 2008 22:13:01 +0900

> you can define your own PATH variable as a value in the registry (in
> key HKLM\Software\GNU\Emacs), and Emacs (the Windows port, at least)
> will obey it.
>    
It does not work.
Quick look at init_environment() in w32.c, it seems Emacs does not look 
for PATH.

Anyway, I can overcome the problem on my own, just end users' sake.
Thanks.

Message #30 received at 942 <at> emacsbugs.donarmstrong.com (full text, mbox):

From: "Juanma Barranquero" <lekktu <at> gmail.com>
To: "Joshua S." <viking_r <at> george24.com>, 942 <at> debbugs.gnu.org
Subject: Re: bug#942: NTEmacs hangs with cygwin\usr\X11R6\bin\libXpm.dll
Date: Tue, 9 Sep 2008 15:37:23 +0200

On Tue, Sep 9, 2008 at 13:58, Joshua S. <viking_r <at> george24.com> wrote:

> It may need a special notice about this when you distribute xpm-enabled
> NTEmacs binaries.
> I know a few users who get into this trouble.

Perhaps it would be worth noting it somewhere, but the trouble is not
Emacs-specific. Other MinGW-built free software using image libraries
could fall in the same trap.

>>>  You can also modify `image-library-alist' in your path. There's no
>
>>  s/path/.emacs/
>
> This does not work when I do "make bootstrap".

True. This could be circumvented with "make PATH=... bootstrap", but
again, it is best not to have Cygwin in the path (or, at the very
least, not before the Emacs binary directory) unless needed.

> I will do the registry thing. Thank you for information.

> It does not work.

Yes, you're right. I misremembered that Emacs looks for HOME. Sorry.

 Juanma

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