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111
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1 /* Test null pointer constants: typedefs for void should be OK but not
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2 qualified void. */
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3 /* Origin: Joseph Myers <joseph@codesourcery.com> */
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4 /* { dg-do compile } */
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5 /* { dg-options "-std=iso9899:1990 -pedantic-errors" } */
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6
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7 typedef void V;
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8 int *p;
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9 long *q;
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10 int j;
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11 void (*fp)(void);
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12
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13 void
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14 f (void)
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15 {
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16 /* (V *)0 is a null pointer constant, so the assignment should be
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17 diagnosed. */
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18 q = (j ? p : (V *)0); /* { dg-error "5:assignment to 'long int \\*' from incompatible pointer type 'int \\*'" } */
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19 q = (j ? p : (void *)0); /* { dg-error "5:assignment to 'long int \\*' from incompatible pointer type 'int \\*'" } */
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20 /* And this conversion should be valid. */
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21 (void (*)(void))(V *)0;
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22 (void (*)(void))(void *)0;
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23 /* Pointers to qualified void are not valid null pointer
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24 constants. */
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25 fp = (const void *)0; /* { dg-error "6:ISO C forbids assignment between function pointer and 'void \\*'" } */
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26 fp = (void *)0;
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27 fp = (V *)0;
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28 fp = 0;
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29 fp == 0;
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30 0 == fp;
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31 fp == (void *)0;
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32 (void *)0 == fp;
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33 fp == (V *)0;
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34 (V *)0 == fp;
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35 fp == (V *)1; /* { dg-error "6:ISO C forbids comparison of 'void \\*' with function pointer" } */
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36 (V *)1 == fp; /* { dg-error "10:ISO C forbids comparison of 'void \\*' with function pointer" } */
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37 fp == (const void *)0; /* { dg-error "6:ISO C forbids comparison of 'void \\*' with function pointer" } */
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38 (const void *)0 == fp; /* { dg-error "19:ISO C forbids comparison of 'void \\*' with function pointer" } */
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39 }
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