Here's a pretty puzzle...

[Zack Weinberg]

On Tue, Apr 17, 2001 at 05:48:06PM +1000, Fergus Henderson wrote:
> On 17-Apr-2001, Zack Weinberg <zackw@stanford.edu> wrote:
> > Suppose you have an untyped enumeration constant.  Let's call it
> > N_OPT, to pick a value not entirely at random.  It's supposed to be
> > defined in a system header, but it might not be.  You want to provide
> > a default value for this constant only if the system header doesn't.
> > You can't use #ifdef, because it isn't a macro, it's only an
> > enumeration constant.
> > 
> > Has anyone any idea how to do that in plain C?
> >
> > This isn't a hypothetical, this is something at least dbxout.c and
> > sdbout.c need to do.
> 
> I don't think it's possible in plain C.  But why not use an autoconf test?

Ugh, if we can't do something clever we should just use our own stab.h
unconditionally.  Hmm...

zw