Incorrect value for auto-save-file-name-transforms

[Joel Ray Holveck]

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In GNU Emacs 21.3.6 (i386-unknown-freebsd5.0, X toolkit)
 of 2003-05-08 on thor.piqnet.org
configured using `configure  --with-iouid --with-x-toolkit=athena --with-xpm 
--with-jpeg --with-tiff --with-gif --with-png --without-toolkit-scroll-bars'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

The value of auto-save-file-name-transforms is incorrect.  In my
version of Emacs, it is
  (("\\`/[^/]*:\\(.+/\\)*\\(.*\\)" "/usr/local/src/emacs-21.3/src/\\2"))

The latter string should be "/tmp/\\2".  The value shown is actually a
directory that no longer exists.  This prevents auto-saves from
succeeding when accessing files remotely using the third-party library
tramp, and possibly ange-ftp.  (Sample message, from a different box:
"Auto-saving elf-char: Opening output file: permission denied,
/usr/local/src/freebsd/ports/editors/emacs21/work/emacs-21.3/src/#elf-char#")

The variable is initialized in files.el, using expand-file-name and
temporary-file-directory.  However, when files.el is loaded (by
temacs), temporary-file-directory remains nil throughout.  This is
because it's set in filelock.c, in syms_of_filelock, so the defvar has
no effect.  In normal Emacs sessions, temporary-file-directory is set
unconditionally in startup.el, but that doesn't apply when temacs
loads.

My proposed fix is to set auto-save-file-name-transforms in
startup.el.  This seems like the best way to handle the problem.

An alternative fix would be to makunbound temporary-file-directory
just before the defvar in files.el, if it is bound but nil.  However,
this means that this variable would depend on the value of $TEMP when
Emacs was compiled, rather than when it was executed.  This does not
seem as useful.

Let me know if you want a patch.

Recent input:
b o u n d SPC ' t e m p o r a r y - f i l e - d i r 
e c t o r y ) ) RET C-p TAB C-p TAB C-p C-n C-b C-a 
C-f C-a C-p C-p C-k C-k ESC x r e p o r t - e m a c 
- DEL s - b i DEL u g RET C-g C-k C-x 2 C-x o C-x o 
C-x 1 ESC x r e p o r t - e m a c s - b u g RET

Recent messages:
Scanning buffer for index ( 96%)
Scanning buffer for index (100%)
Mark saved where search started
Note: file is write protected
Mark saved where search started
call-interactively: Buffer is read-only: #<buffer files.el,v>
Auto-saving...done
Auto-saving...done
Loading cl-indent...done
Loading emacsbug...done
byte-code: Quit

-- 
Joel Ray Holveck - joelh@piquan.org
   Fourth law of programming:
   Anything that can go wrong wi
sendmail: segmentation violation - core dumped