bug#8014: 24.0.50; compilation-mode does not track directories

[Sam Steingold]

In GNU Emacs 24.0.50.2 (x86_64-unknown-linux-gnu, X toolkit)
 of 2011-02-09 on tbox
Windowing system distributor `Colin Harrison', version 11.0.60900031
configured using `configure  '--with-x-toolkit=lucid''

I have a buffer with this text:
======================================================
make: Entering directory `/home/sds/code/core'
make[1]: Entering directory `/home/sds/code/core/tests'
make[1]: Leaving directory `/home/sds/code/core/tests'
make: Leaving directory `/home/sds/code/core'
make: Entering directory `/home/sds/code/m2'
make[1]: Entering directory `/home/sds/code/core'
make[1]: Leaving directory `/home/sds/code/core'
make[1]: Entering directory `/home/sds/code/m2/defs'
make[1]: Leaving directory `/home/sds/code/m2/defs'
meng/book.h:170: warning: unused parameter 'do_print'
meng/book.h:170: warning: unused parameter 'do_print'
../../m2/commit/shmem_buffer.h:41: warning: comparison between signed and 
unsigned integer expressions
../../m2/commit/shmem_buffer.h:62: warning: comparison between signed and 
unsigned integer expressions
srserver.cpp:369: warning: unused variable 'conn'
srserver.cpp:366: warning: unused parameter 'listen_at'
srserver.cpp:382: warning: unused parameter 'success'
../../m2/commit/merger.h:83: warning: control reaches end of non-void function
======================================================

I do M-x compilation-mode RET and see very pretty fontifications which
give me some false hope.
When I click on the full paths in the "make...directory" lines, I get
the correct dired buffers. This is good.
Alas, clicking on the warnings does not work: I am asked which file I
want to visit. This is no good. Emacs can figure out the full pathname
perfectly fine by parsing the "make...directory" lines.
Specifically, the last "Entering" line which is not matched with a
"Leaving" line points to "code/m2", so the first file "meng/book.h"
should be found in code/core/meng/book.h - and, lo and behold, it is there!



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Sam Steingold (http://sds.podval.org/) on CentOS release 5.3 (Final)
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