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

/* Test for warnings for missing format attributes.  */
/* Origin: Joseph Myers <jsm28@cam.ac.uk> */
/* { dg-do compile } */
/* { dg-options "-std=gnu99 -Wmissing-format-attribute" } */

#include "format.h"

void
foo (const char *fmt, ...)
{
  va_list ap;
  va_start (ap, fmt);
  vprintf (fmt, ap); /* { dg-warning "candidate" "printf attribute warning" } */
  va_end (ap);
}

void
bar (const char *fmt, ...)
{
  va_list ap;
  va_start (ap, fmt);
  vscanf (fmt, ap); /* { dg-warning "candidate" "scanf attribute warning" } */
  va_end (ap);
}

__attribute__((__format__(gnu_attr___printf__, 1, 2))) void
foo2 (const char *fmt, ...)
{
  va_list ap;
  va_start (ap, fmt);
  vprintf (fmt, ap);
  va_end (ap);
}

void
vfoo (const char *fmt, va_list arg)
{
  vprintf (fmt, arg); /* { dg-warning "candidate" "printf attribute warning 2" } */
}