is fork() supported?

[DJ Delorie]

Florian Weimer via Libffi-discuss <libffi-discuss@sourceware.org>
writes:
>> The bug that will never die.
> Well, there are two ways to fix it:

The thread ended without resolution...  we've (RH) got a bug report
against it, and I need to know if I can tell them "don't do that" or if
I'm obligated to pursue some fix.

So my question isn't CAN we fix it, it's MUST we fix it...  I.e. is this
a supported feature, or something that 'happened to work' so got abused?