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131
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1 /* PR middle-end/84108 - incorrect -Wattributes warning for packed/aligned
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2 conflict on struct members
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3 { dg-do compile }
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4 { dg-options "-Wall -Wattributes" } */
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5
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6 #define ATTR(list) __attribute__ (list)
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7 #define ASSERT(e) _Static_assert (e, #e)
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8
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9 /* GCC is inconsistent in how it treats attribute aligned between
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10 variable and member declarations. Attribute aligned alone is
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11 sufficient to reduce a variable's alignment requirement but
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12 the attribute must be paired with packed to have the same
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13 effect on a member. Worse, declaring a variable both aligned
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14 and packed emits a warning. */
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15
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16 /* Avoid exercising this since emitting a warning for these given
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17 the requirement for members seems like a misfeature:
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18 int a ATTR ((packed, aligned (2))); // -Wattributes
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19 int b ATTR ((aligned (2), packed)); // -Wattributes
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20 ASSERT (_Alignof (a) == 2);
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21 ASSERT (_Alignof (b) == 2); */
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22
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23 int c ATTR ((aligned (2))); // okay (reduces alignment)
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24 ASSERT (_Alignof (c) == 2);
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25
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26 struct {
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27 int a ATTR ((packed, aligned (2))); /* { dg-bogus "\\\[-Wattributes" } */
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28 int b ATTR ((aligned (2), packed)); /* { dg-bogus "\\\[-Wattributes" } */
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29
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30 /* Avoid exercising this since the attribute has no effect yet
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31 there is no warning.
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32 int c ATTR ((aligned (2))); // missing warning? */
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33 } s;
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34
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35 ASSERT (_Alignof (s.a) == 2);
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36 ASSERT (_Alignof (s.b) == 2);
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37
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38 /* ASSERT (_Alignof (s.c) == 4); */
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