gcc/testsuite/gcc.dg/format/null-1.c

   1 /* Test for some aspects of null format string handling.  */
   2 /* Origin: Jason Thorpe <thorpej@wasabisystems.com> */
   3 /* { dg-do compile } */
   4 /* { dg-options "-std=gnu99 -Wformat" } */
   5
   6 #define DONT_GNU_PROTOTYPE
   7 #include "format.h"
   8
   9 extern void my_printf (const char *, ...) __attribute__((format(gnu_attr_printf,1,2)));
  10 extern const char *my_format (const char *, const char *)
  11   __attribute__((format_arg(2)));
  12
  13 void
  14 foo (int i1)
  15 {
  16   /* Warning about a null format string has been decoupled from the actual
  17      format check.  However, we still expect to be warned about any excess
  18      arguments after a null format string.  */
  19   my_printf (NULL);
  20   my_printf (NULL, i1); /* { dg-warning "too many" "null format with arguments" } */
  21
  22   my_printf (my_format ("", NULL));
  23   my_printf (my_format ("", NULL), i1); /* { dg-warning "too many" "null format_arg with arguments" } */
  24
  25   /* While my_printf allows a null argument, dgettext does not, so we expect
  26      a null argument warning here.  */
  27   my_printf (dgettext ("", NULL)); /* { dg-warning "null" "null format with dgettext" } */
  28 }