C89 question: Do we need to accept -Wint-conversion warnings

[Florian Weimer via Gcc]

Are these code fragments valid C89 code?

  int i1 = 1;
  char *p1 = i;

  char c;
  char *p2 = &c;
  int i2 = p2;

Or can we generate errors for them even with -std=gnu89?

(It will still be possible to override this with -fpermissive or
-Wno-int-conversion.)

Thanks,
Florian