[Bug c/14933] New: missing pre-compiled header depends with -MD

["dfries at mail dot win dot org" <gcc-bugzilla@gcc.gnu.org>]

When using a pre-compiled header the option -MD produces no
dependencies on the pre-compiled header or the headers that the
pre-compiled header is composed of.  I would expect the same problem
on any of the dependency generating options.

SpacedOut:/tmp/test$ gcc -MD headers.h  -o headers.h.gch
SpacedOut:/tmp/test$ cat headers.h.d 
headers.h.gch: headers.h

> so far so good

SpacedOut:/tmp/test$ gcc -MD main.c -o main 
SpacedOut:/tmp/test$ cat main.d
main: main.c

> So main doesn't require anything?  I don't think so.

SpacedOut:/tmp/test$ rm -f *.d *.i *.s a.out *.gch main
SpacedOut:/tmp/test$ gcc -MD main.c -o main 
SpacedOut:/tmp/test$ cat main.d
main: main.c headers.h

> Much better.  I would think it should be the following when using
> the precompiled headers.
main: main.c headers.h.gch

SpacedOut:/tmp/test$ gcc -v
Reading specs from /home/david/WorkProjects/OpenSceneGraph/DevelGcc/install/lib/gcc/i686-pc-linux-gnu/3.5.0/specs
Configured with: ../gcc_src/configure --enable-languages=c++ --prefix=/home/david/WorkProjects/OpenSceneGraph/DevelGcc/install 
--exec-prefix=/home/david/WorkProjects/OpenSceneGraph/DevelGcc/install
Thread model: posix
gcc version 3.5.0 20040412 (experimental)


header.h:
#ifndef _HEADERS_H
#define _HEADERS_H 1
const int value=32;
#endif /* _HEADERS_H */

main.c:
#include "headers.h"

int main(int argc, char ** argv)
{
        return value;
}

-- 
           Summary: missing pre-compiled header depends with -MD
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dfries at mail dot win dot org
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i386-linux
  GCC host triplet: i386-linux
GCC target triplet: i386-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14933