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111
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1 /* Test for constant expressions: cases involving VLAs and typeof, at
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2 file scope. */
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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=gnu99 -pedantic-errors" } */
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6
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7 /* It appears address constants may contain casts to variably modified
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8 types. Whether they should be permitted was discussed in
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9 <http://groups.google.com/group/comp.std.c/msg/923eee5ab690fd98>
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10 <LV7g2Vy3ARF$Ew9Q@romana.davros.org>; since static pointers to VLAs
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11 are definitely permitted within functions and may be initialized
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12 and such initialization involves implicit conversion to a variably
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13 modified type, allowing explicit casts seems appropriate. Thus,
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14 GCC allows them as long as the "evaluated" size expressions do not
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15 contain the various operators not permitted to be evaluated in a
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16 constant expression, and as long as the result is genuinely
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17 constant (meaning that pointer arithmetic using the size of the VLA
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18 is generally not permitted). */
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19
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20 static int sa[100];
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21 int m;
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22 int n;
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23
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24 static int (*a1)[] = &sa;
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25 static int (*a2)[] = (__typeof__(int (*)[n]))sa;
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26 static int (*a4)[] = (__typeof__((int (*)[n])sa))sa;
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27 static int (*a5)[] = (__typeof__((int (*)[m++])sa))sa; /* { dg-error "constant" } */
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28 static int (*a6)[] = (__typeof__((int (*)[100])(int (*)[m++])sa))sa;
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29 static int (*a7)[] = (__typeof__((int (*)[n])sa + m++))sa; /* { dg-error "constant" } */
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