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111
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1 /* Test for constant expressions: details of what is a null pointer
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2 constant.
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3 */
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4 /* Origin: Joseph Myers <jsm28@cam.ac.uk> */
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5 /* { dg-do compile } */
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6 /* { dg-options "-std=iso9899:1999" } */
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7 /* Note: not using -pedantic since the -std option alone should be enough
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8 to give the correct behavior to conforming programs. If -pedantic is
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9 needed to make (say) (0, 0) not be a constant expression, this is a
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10 bug.
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11 */
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12
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13 int *a;
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14 int b;
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15 long *c;
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16
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17 #if defined(_LP64)
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18 #define ZERO 0L
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19 #elif defined(_WIN64)
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20 #define ZERO 0LL
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21 #else
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22 #define ZERO 0
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23 #endif
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24
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25 /* Assertion that n is a null pointer constant: so the conditional expression
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26 has type 'int *' instead of 'void *'.
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27 */
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28 #define ASSERT_NPC(n) (b = *(1 ? a : (n)))
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29 /* Assertion that n is not a null pointer constant: so the conditional
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30 expressions has type 'void *' instead of 'int *'.
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31 */
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32 #define ASSERT_NOT_NPC(n) (c = (1 ? a : (n)))
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33
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34 void
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35 foo (void)
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36 {
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37 ASSERT_NPC (0);
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38 ASSERT_NPC ((void *)0);
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39 ASSERT_NOT_NPC ((void *)(void *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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40 ASSERT_NOT_NPC ((void *)(char *)0); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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41 ASSERT_NOT_NPC ((void *)(0, ZERO)); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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42 ASSERT_NOT_NPC ((void *)(&"Foobar"[0] - &"Foobar"[0])); /* { dg-bogus "incompatible" "bogus null pointer constant" } */
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43 /* This last one is a null pointer constant in C99 only. */
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44 ASSERT_NPC ((void *)(1 ? 0 : (0, 0)));
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45 }
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