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