gnu/dist/gcc4/gcc/testsuite/gcc.dg/format/attr-5.c

   1 /* Test for format attributes: test default attributes are silently ignored
   2    when a function is redeclared in an inappropriate manner.  */
   3 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
   4 /* { dg-do compile } */
   5 /* { dg-options "-std=gnu99 -Wformat" } */
   6
   7 /* We can't #include "format.h" here.  */
   8
   9 /* This scanf declaration is static, so can't be the system function.  */
  10 static int scanf(const char *restrict, ...);
  11
  12 /* This sscanf declaration doesn't have variable arguments, so isn't
  13    compatible with a format attribute.  */
  14 extern int sscanf(const char *restrict, const char *restrict, int *); /* { dg-warning "conflict" "conflict" } */
  15
  16 void
  17 foo (const char *s, int *p)
  18 {
  19   scanf("%ld", p); /* { dg-bogus "format" "static" } */
  20   sscanf(s, "%ld", p); /* { dg-bogus "format" "wrong type" } */
  21 }
  22
  23 /* Dummy definition of scanf.  */
  24 static int
  25 scanf (const char *restrict fmt, ...)
  26 {
  27   return 0;
  28 }