Re: built-in variable `font-use-system-font' not bound

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> Regardless of how things currently are (we currently have a big mess in
>> this respect), we should follow the following convention:
>> - if it's a feature specific to X11, W32, NS, ... then use a name that
>> starts with "x-", "w32-", "ns-", ...
>> - if it's a feature that makes sense everywhere, then don't use such
>> a prefix (even if it's only implemented for some of the backends).

> If we follow that convention, I think we need another prefix for
> functions/variables that are common across window systems that can be used
> in the test to avoid warnings/errors in cus-start.el for tty only builds.
> Currently we usually use x- for these, since historically most such features
> started on X and were ported to other window systems later.

So you mean features that only make sense for GUIs but not for
text-based terminals like ttys?  I can't think of any such feature
which couldn't be treated similarly to "a feature that makes sense
everywhere but hasn't yet been implemented in all terminal types".


        Stefan