gcc/testsuite/gcc.dg/format/miss-7.c

   1 /* PR77336 - -Wsuggest-attribute=format warning overly simplistic */
   2 /* { dg-do compile } */
   3 /* { dg-options "-Wsuggest-attribute=format" } */
   4
   5 #include "format.h"
   6
   7 const char format[] = "%i";
   8
   9 void foo (char *d, unsigned n, va_list va)
  10 {
  11   (void)&n;
  12
  13   /* The following calls don't imply that the enclosing function is
  14      a candiate for the format attribute because it uses a string
  15      constant as the format.  */
  16   vsnprintf (d, n, "%i", va);
  17
  18   vsnprintf (d, n, format, va);
  19
  20   /* In theory this should not trigger the warning either but GCC
  21      doesn't treat the local static constant the same way as the
  22      global and issues a false positive.
  23   const char fmt[] = "%i";
  24   vsnprintf (d, n, fmt, va);
  25   */
  26 }
  27
  28 void bar (char *d, unsigned n, const char *f, va_list va)
  29 {
  30   (void)&n;
  31
  32   /* The following call suggests that the enclosing function might
  33      be a candiate for the format attribute because it doesn't use
  34      a string literal as the format.  */
  35   vsnprintf (d, n, f, va);   /* { dg-warning "function .bar. might be a candidate for .gnu_printf. format attribute" } */
  36 }