[Bug preprocessor/30468] New: -M not fully chops dirname

["kaminaga at sm dot sony dot co dot jp" <gcc-bugzilla at gcc dot gnu dot org>]

I see -M option for gcc-4.1.1 output chops dirname, but faces below
problem.

$ cat foo.c 
#include "foo.h"
$ cat Include/foo.h 
/* empty */
$ gcc41 -M -I.//Include foo.c 
foo.o: foo.c /Include/foo.h
             ^
             root?


gcc-3.4.4 output was:
$ gcc -M -I.//Include foo.c 
foo.o: foo.c .//Include/foo.h


-- 
           Summary: -M not fully chops dirname
           Product: gcc
           Version: 4.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: preprocessor
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: kaminaga at sm dot sony dot co dot jp


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30468