gcc/testsuite/gcc.dg/format/ms_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 { target { *-*-mingw* } } } */
   6 /* { dg-options "-std=gnu99 -Wformat -Wno-format-extra-args" } */
   7
   8 #define USE_SYSTEM_FORMATS
   9 #include "format.h"
  10
  11 void
  12 foo (int i, int *ip, va_list va)
  13 {
  14   printf ("%3$d%1$d", i, i, i); /* { dg-warning "before used" "unused $ operand" } */
  15   printf ("%2$d%1$d", i, i, i);
  16   vprintf ("%3$d%1$d", va); /* { dg-warning "before used" "unused $ operand" } */
  17   /* With scanf formats, gaps in the used arguments are allowed only if the
  18      arguments are all pointers.  In such a case, should only give the lesser
  19      warning about unused arguments rather than the more serious one about
  20      argument gaps.  */
  21   scanf ("%3$d%1$d", ip, ip, ip);
  22   /* If there are non-pointer arguments unused at the end, this is also OK.  */
  23   scanf ("%3$d%1$d", ip, ip, ip, i);
  24   scanf ("%3$d%1$d", ip, i, ip); /* { dg-warning "before used" "unused $ scanf non-pointer operand" } */
  25   /* Can't check the arguments in the vscanf case, so should suppose the
  26      lesser problem.  */
  27   vscanf ("%3$d%1$d", va);
  28 }