+
−/* Test null pointer constants: typedefs for void should be OK but not
+
−   qualified void.  */
+
−/* Origin: Joseph Myers <joseph@codesourcery.com> */
+
−/* { dg-do compile } */
+
−/* { dg-options "-std=iso9899:1999 -pedantic-errors" } */
+
−
+
−typedef void V;
+
−int *p;
+
−long *q;
+
−int j;
+
−void (*fp)(void);
+
−
+
−void
+
−f (void)
+
−{
+
−  /* (V *)0 is a null pointer constant, so the assignment should be
+
−     diagnosed.  */
+
−  q = (j ? p : (V *)0); /* { dg-error "assignment to 'long int \\*' from incompatible pointer type 'int \\*'" } */
+
−  q = (j ? p : (void *)0); /* { dg-error "assignment to 'long int \\*' from incompatible pointer type 'int \\*'" } */
+
−  /* And this conversion should be valid.  */
+
−  (void (*)(void))(V *)0;
+
−  (void (*)(void))(void *)0;
+
−  /* Pointers to qualified void are not valid null pointer
+
−     constants.  */
+
−  fp = (const void *)0; /* { dg-error "ISO C forbids assignment between function pointer and 'void \\*'" } */
+
−  fp = (void *)0;
+
−  fp = (V *)0;
+
−  fp = 0;
+
−  fp == 0;
+
−  0 == fp;
+
−  fp == (void *)0;
+
−  (void *)0 == fp;
+
−  fp == (V *)0;
+
−  (V *)0 == fp;
+
−  fp == (V *)1; /* { dg-error "ISO C forbids comparison of 'void \\*' with function pointer" } */
+
−  (V *)1 == fp; /* { dg-error "ISO C forbids comparison of 'void \\*' with function pointer" } */
+
−  fp == (const void *)0; /* { dg-error "ISO C forbids comparison of 'void \\*' with function pointer" } */
+
−  (const void *)0 == fp; /* { dg-error "ISO C forbids comparison of 'void \\*' with function pointer" } */
+
−}