Not really. One just implements them. For instance, there's no requirement
for all function bodies to use the same scheme.
The unusual bit is that you need to tell the loader what's going on, but
there are still a few bits free for that.
I haven't looked at the details here, but I've had to implement this
before, for Ada, in a different environment,
and don't remember it being too hard, compared to a big list of much harder
things.

On 16 January 2012 16:07, Joel C. Salomon <joelcsalomon@gmail.com> wrote:

> This would make it difficult to implement C99's variable-length
> (actually, run-time-determined--length) arrays.
>