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