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131
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1 // PR c++/83993
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2 // { dg-do compile { target c++11 } }
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3 // { dg-options "" }
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4
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5 extern const int a[];
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6 const int b[5] = { 1, 2, 3, 4, 5 };
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7 extern const int c[4];
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8 constexpr const int *d = &a[0];
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9 constexpr const int *d2 = a;
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145
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10 constexpr const int *e = &a[1]; // { dg-error "nonzero array subscript '1' is used with array 'a' of type 'const int \\\[\\\]' with unknown bounds" }
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131
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11 constexpr const int *f = &b[0];
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12 constexpr const int *f2 = b;
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13 constexpr const int *g = &b[5];
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14 constexpr const int *h = &b[6]; // { dg-error "array subscript value '6' is outside the bounds of array 'b' of type 'const int \\\[5\\\]'" }
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15 constexpr const int *i = &c[0];
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16 constexpr const int *i2 = c;
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17 constexpr const int *j = &c[4];
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18 constexpr const int *k = &c[5]; // { dg-error "array subscript value '5' is outside the bounds of array 'c' of type 'const int \\\[4\\\]'" }
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19 extern const int l[];
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20
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21 void
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22 foo ()
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23 {
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24 extern const int l[3];
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25 constexpr const int *m = &l[0];
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26 constexpr const int *m2 = l;
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27 constexpr const int *n = &l[1];
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28 static_assert (m == m2, "");
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29 }
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30
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31 constexpr const int *m = &l[0];
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32 constexpr const int *m2 = l;
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33 constexpr const int *n = &l[1]; // { dg-error "nonzero array subscript '1' is used with array 'l' of type 'const int \\\[\\\]' with unknown bounds" }
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34 static_assert (d == d2 && f == f2 && i == i2 && m == m2, "");
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35 const int o[] = { 1, 2 };
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36 constexpr const int *p = &o[0];
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37 constexpr const int *p2 = o;
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38 constexpr const int *q = &o[2];
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39 constexpr const int *r = &o[3]; // { dg-error "array subscript value '3' is outside the bounds of array 'o' of type 'const int \\\[2\\\]'" }
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40 struct S { char a; char b[]; } s;
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41 constexpr const char *t = &s.b[0];
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42 constexpr const char *t2 = s.b;
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145
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43 constexpr const char *u = &s.b[1]; // { dg-error "nonzero array subscript '1' is used with array of type 'char \\\[\\\]' with unknown bounds" }
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131
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44 struct V { int a; };
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45 extern V v[];
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46 constexpr V *w = &v[0];
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47 constexpr V *w2 = v;
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48 constexpr int *x = &v[0].a;
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49 constexpr int y = a[0]; // { dg-error "the value of 'a' is not usable in a constant expression" }
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