Description of problem:

gcc 4.3.0 as shipped in Fedora 9 pre produces broken code when building un-protoyped functions with 
-mregparm=3

Version-Release number of selected component (if applicable):4.3.0-7


How reproducible:

Build the following test program, with -mregparm=3

extern int printf (const char *, ...) __attribute__ ((regparm(0)));

static int test();

int main(int argc, char **argv) {

  test(0,1,2,3,4,5,6,7);
}

static int test(int a, int b, int c, int d, int e, int f, int g, int h) {
  if (a != 0 || b != 1 || c != 2) {
    printf("Wrong: Got (%p, %p, %p, %p, %p, %p, %p, %p)", a, b, c, d, e, f, g, h);
  }

  return 1;
}

Steps to Reproduce:
1. Compile the above program with -mregparm=3
2. Run it
  
Actual results:

Program produces output similar to:

Wrong: Got (0x1, 0xbfc96430, 0xbfc96410, (nil), 0x1, 0x2, 0x3, 0x4)

Expected results:

Program produces no output.

Additional info:

It looks like the calling convention is getting screwed up when regparm is being used with defintions 
that aren't fully prototyped (adding a complete prototype for test will fix this problem).