[RFA] Fix bug in set substitute-patch

[Joel Brobecker <brobecker@adacore.com>]

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This should fix a bug reported by Daniel when the source file is
compiled using absolute filenames.

        % gcc -c -o foo /path/to/foo.c

As Daniel reported, what happens in this case is that the compiler
puts the filename full path into the filename, and then leaves the
dirname empty.

2007-01-12  Joel Brobecker  <brobecker@adacore.com>

        * source.c (find_and_open_source): Try rewriting the source
        path inside filename if dirname is NULL.

Tested on x86-linux, no regression.
OK to apply?

Thanks,
-- 
Joel

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Index: source.c
===================================================================
RCS file: /cvs/src/src/gdb/source.c,v
retrieving revision 1.77
diff -u -p -r1.77 source.c
--- source.c	9 Jan 2007 17:58:58 -0000	1.77
+++ source.c	12 Jan 2007 04:01:21 -0000
@@ -1001,6 +1001,18 @@ find_and_open_source (struct objfile *ob
 	  strcat (path + len, source_path + len + cdir_len);	/* After $cdir */
 	}
     }
+  else
+    {
+      /* If dirname is NULL, chances are the path is embedded in
+         the filename.  Try the source path substitution on it.  */
+      char *rewritten_filename = rewrite_source_path (filename);
+
+      if (rewritten_filename != NULL)
+        {
+          make_cleanup (xfree, rewritten_filename);
+          filename = rewritten_filename;
+        }
+    }
 
   result = openp (path, OPF_SEARCH_IN_PATH, filename, OPEN_MODE, 0, fullname);
   if (result < 0)