compile/grep: When directory tracking is used then next-error fails to go to the correct file when the basename was seen before.

[Vagn Johansen]

The problem occurs occurs when compiling or grepping. After running
the compile command that gave the output seen below then running
next-error four times only visits dir1/file.cpp. The third next-error
should have opened dir2/file.cpp. The problem occurs because the same
filename (basename) file.cpp is used in the two directories.

make -w -C dir1; make -w -C dir2
make: Entering directory `/Users/vagn/tmp/dir1'
g++ -Wall file.cpp
file.cpp: In function 'int main(int, char**)':
file.cpp:5: warning: unused variable 'xx1'
file.cpp:6: warning: unused variable 'xx2'
make: Leaving directory `/Users/vagn/tmp/dir1'
make: Entering directory `/Users/vagn/tmp/dir2'
g++ -Wall file.cpp
file.cpp: In function 'int main(int, char**)':
file.cpp:5: warning: unused variable 'yy'
file.cpp:6: warning: unused variable 'yy2'
make: Leaving directory `/Users/vagn/tmp/dir2'


In GNU Emacs 22.1.1 (i386-apple-darwin8.9.1, Carbon Version 1.6.0)
 of 2007-06-15 on vj-mac.local
Windowing system distributor `Apple Inc.', version 10.4.10
configured using `configure  '--enable-carbon-app''

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: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: C++/l

Minor modes in effect:
  shell-dirtrack-mode: t
  encoded-kbd-mode: t
  show-paren-mode: t
  minibuffer-electric-default-mode: t
  iswitchb-mode: t
  dir-locals-mode: t
  display-time-mode: t
  which-function-mode: t
  recentf-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t
  abbrev-mode: t
  hs-minor-mode: t

Recent messages:
compilation-next-error: Moved back before first error
compilation-next-error: Moved past last error
Mark set [2 times]
Wrote /Users/vagn/tmp/dir1/file.cpp
Mark set [3 times]
Auto-saving...done
Wrote /Users/vagn/tmp/dir2/file.cpp
(No files need saving)
Making completion list...
Loading emacsbug...done


--
Vagn Johansen