stdio-common/bug21.c

   1 #include <stdio.h>
   2 #include <libc-diag.h>
   3
   4 static int
   5 do_test (void)
   6 {
   7   static const char buf[] = " ";
   8   char *str;
   9
  10   /* GCC in C99 mode treats %a as the C99 format expecting float *,
  11      but glibc with _GNU_SOURCE treats %as as the GNU allocation
  12      extension, so resulting in "warning: format '%a' expects argument
  13      of type 'float *', but argument 3 has type 'char **'".  This
  14      applies to the other %as, %aS and %a[] formats below as well.  */
  15   DIAG_PUSH_NEEDS_COMMENT;
  16   DIAG_IGNORE_NEEDS_COMMENT (4.9, "-Wformat");
  17   int r = sscanf (buf, "%as", &str);
  18   DIAG_POP_NEEDS_COMMENT;
  19   printf ("%d %p\n", r, str);
  20
  21   return r != -1 || str != NULL;
  22 }
  23
  24 #define TEST_FUNCTION do_test ()
  25 #include "../test-skeleton.c"