glibc/string/bug-strspn1.c

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/* Test case by Joseph S. Myers <jsm28@cam.ac.uk>. */
#undef __USE_STRING_INLINES
#define __USE_STRING_INLINES
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <libc-diag.h>
int
main (void)
{
const char *a = "abc";
const char *b = a;
DIAG_PUSH_NEEDS_COMMENT;
/* GCC 9 correctly warns that this call to strspn is useless. That
is deliberate; this test is verifying that a side effect in an
argument still occurs when the call itself is useless and could
be optimized to return a constant. */
DIAG_IGNORE_NEEDS_COMMENT (9, "-Wunused-value");
strspn (b++, "");
DIAG_POP_NEEDS_COMMENT;
if (b != a + 1)
return 1;
return 0;
}