[Python-Dev] Re: tp_clear return value

[Tim Peters]

[Neil Schemenauer]
> I agree that concentrating the ugliness is good.  However, how portable
> is setjmp/longjmp?  The manual page I have says C99.

It's also C89, i.e. "ANSI C".

> Can we rely on it being available?

I think so.  Note that we have three modules that use them now, although
they're not compiled everywhere (readline, pcre, fpectl).

> If not, could we just disable the gcmodule functions that depend on it?

Jeremy and I have spent a lot of time tracking down leaks (in Python and in
Zope) recently, and get_refer{rers, ents} have been invaluable.  If we found
a platform where {set,long}jmp didn't work, I'd be OK with disabling those
two gc functions on that platform.  Those functions aren't needed for normal
gc operation, and it's not any platform I'm going to be using anyway <wink>.