gcc/testsuite/gcc.dg/format/no-exargs-2.c

   1 /* Test for warnings for extra format arguments being disabled by
   2    -Wno-format-extra-args.  Test which warnings still apply with $
   3    operand numbers.  */
   4 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
   5 /* { dg-do compile } */
   6 /* { dg-options "-std=gnu99 -Wformat -Wno-format-extra-args" } */
   7
   8 #include "format.h"
   9
  10 void
  11 foo (int i, int *ip, va_list va)
  12 {
  13   printf ("%3$d%1$d", i, i, i); /* { dg-warning "before used" "unused $ operand" } */
  14   printf ("%2$d%1$d", i, i, i);
  15   vprintf ("%3$d%1$d", va); /* { dg-warning "before used" "unused $ operand" } */
  16   /* With scanf formats, gaps in the used arguments are allowed only if the
  17      arguments are all pointers.  In such a case, should only give the lesser
  18      warning about unused arguments rather than the more serious one about
  19      argument gaps.  */
  20   scanf ("%3$d%1$d", ip, ip, ip);
  21   /* If there are non-pointer arguments unused at the end, this is also OK.  */
  22   scanf ("%3$d%1$d", ip, ip, ip, i);
  23   scanf ("%3$d%1$d", ip, i, ip); /* { dg-warning "before used" "unused $ scanf non-pointer operand" } */
  24   /* Can't check the arguments in the vscanf case, so should suppose the
  25      lesser problem.  */
  26   vscanf ("%3$d%1$d", va);
  27 }