1 /* Test for constant expressions: cases involving VLAs and typeof, at
2    file scope.  */
3 /* Origin: Joseph Myers <joseph@codesourcery.com> */
4 /* { dg-do compile } */
5 /* { dg-options "-std=gnu99 -pedantic-errors" } */
6 
7 /* It appears address constants may contain casts to variably modified
8    types.  Whether they should be permitted was discussed in
9    <http://groups.google.com/group/comp.std.c/msg/923eee5ab690fd98>
10    <LV7g2Vy3ARF$Ew9Q@romana.davros.org>; since static pointers to VLAs
11    are definitely permitted within functions and may be initialized
12    and such initialization involves implicit conversion to a variably
13    modified type, allowing explicit casts seems appropriate.  Thus,
14    GCC allows them as long as the "evaluated" size expressions do not
15    contain the various operators not permitted to be evaluated in a
16    constant expression, and as long as the result is genuinely
17    constant (meaning that pointer arithmetic using the size of the VLA
18    is generally not permitted).  */
19 
20 static int sa[100];
21 int m;
22 int n;
23 
24 static int (*a1)[] = &sa;
25 static int (*a2)[] = (__typeof__(int (*)[n]))sa;
26 static int (*a4)[] = (__typeof__((int (*)[n])sa))sa;
27 static int (*a5)[] = (__typeof__((int (*)[m++])sa))sa; /* { dg-error "constant" } */
28 static int (*a6)[] = (__typeof__((int (*)[100])(int (*)[m++])sa))sa;
29 static int (*a7)[] = (__typeof__((int (*)[n])sa + m++))sa; /* { dg-error "constant" } */
30