string/bug-strspn1.c

   1 #undef __USE_STRING_INLINES
   2 #define __USE_STRING_INLINES
   3 #include <string.h>
   4 #include <stdlib.h>
   5 #include <stdio.h>
   6 #include <libc-diag.h>
   7
   8 int
   9 main (void)
  10 {
  11   const char *a = "abc";
  12   const char *b = a;
  13
  14   DIAG_PUSH_NEEDS_COMMENT;
  15   /* GCC 9 correctly warns that this call to strspn is useless.  That
  16      is deliberate; this test is verifying that a side effect in an
  17      argument still occurs when the call itself is useless and could
  18      be optimized to return a constant.  */
  19   DIAG_IGNORE_NEEDS_COMMENT (9, "-Wunused-value");
  20   strspn (b++, "");
  21   DIAG_POP_NEEDS_COMMENT;
  22   if (b != a + 1)
  23     return 1;
  24
  25   return 0;
  26 }