On Thu, Apr 23, 2009 at 1:38 PM, Denis Onischenko
<denis.onische...@gmail.com> wrote:
> The minimal code example is following:
>
>
> extern unsigned int __invalid_size_argument;
> #define TYPECHECK(t) ( sizeof(t) == sizeof(t[1]) ? sizeof(t) :
> __invalid_size_argument )
>
> static int arr[] = {
> [TYPECHECK(int)] = 0,
> };
>
> int main()
> {
> return 0;
> }
>
>
> command line is: gcc test.c
>
> GCC 4.5.0 revision 146607 compiles this code with following errors:
> test.c:5: error: nonconstant array index in initializer
> test.c:5: error: (near initialization for 'arr')
>
> released GCC 4.4.0 compiles without any errors
A diagnostic is required in standards-conforming modes, as
TYPECHECK(int) is not an "integral constant expression" (because it
includes a non-constant in a potentially-evaluated operand).
-- James
