Bug#176387: {sparc} gcc-3.2 regression

[Matthias Klose <doko@cs.tu-berlin.de>]

Package: gcc-3.2
Version: 2.3.1-9
Severity: important

Distilled from the gpc bootstrap failure on sparc-linux:

#include <stdio.h>

int main ()
{
  FILE *s = fopen("foobar","w");
  char a[4] = { 0, 0, -1, 0 };
  printf ("%i\n", fwrite_unlocked (a, 1, 4, s));
}

$ gcc-2.95 -O2 fbug.c && ./a.out
4
$ gcc-3.0 -O2 fbug.c && ./a.out
4
$ gcc-3.2 -O2 fbug.c && ./a.out
2
$ gcc-3.2 -O1 fbug.c && ./a.out
4


Or a simplified example from the fwrite_unlocked macro definition:

int x = 0;

int main ()
{
  char a[4] = { -1 }, *q = a;
  int c;
  for (c = 2; c > 0; --c)
    if ((x ? 0 : (unsigned char) (*q = *a)) == -1)
      break;
  printf ("%i\n", c);
}