re PR preprocessor/30468 (-M not fully chops dirname)

	PR preprocessor/30468:
	* mkdeps.c (apply_vpath): Strip successive '/'s if we stripped
	'./'.

From-SVN: r121341

libcpp/ChangeLog

 2007-01-30  Tom Tromey  <tromey@redhat.com>
 
+	PR preprocessor/30468:
+	* mkdeps.c (apply_vpath): Strip successive '/'s if we stripped
+	'./'.
+
+2007-01-30  Tom Tromey  <tromey@redhat.com>
+
 	PR preprocessor/29966:
 	* macro.c (lex_expansion_token): Save and restore cpp_reader's
 	cur_token.

libcpp/mkdeps.c

 /* Dependency generator for Makefile fragments.
-   Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
+   Copyright (C) 2000, 2001, 2003, 2007 Free Software Foundation, Inc.
    Contributed by Zack Weinberg, Mar 2000
 
 This program is free software; you can redistribute it and/or modify it
@@ -141,7 +141,13 @@ apply_vpath (struct deps *d, const char *t)
 
   /* Remove leading ./ in any case.  */
   while (t[0] == '.' && IS_DIR_SEPARATOR (t[1]))
-    t += 2;
+    {
+      t += 2;
+      /* If we removed a leading ./, then also remove any /s after the
+	 first.  */
+      while (IS_DIR_SEPARATOR (t[0]))
+	++t;
+    }
 
   return t;
 }