> Date: Tue, 12 Apr 2005 20:24:49 -0500 (CDT)
> From: Luc Teirlinck <[EMAIL PROTECTED]>
> CC: [EMAIL PROTECTED], emacs-devel@gnu.org
>
> I guess that you check for MSDOS with `(eq system-type 'ms-dos)' from
> Lisp and with `#ifdef MSDOS' from C.
Only if no other good method exists. Usually, testing some function
to be fboundp is a much better method. For example, here's how
startup.el figures out that it runs on MSDOS or a text terminal with
no X support compiled in (thus, no primitive support for tooltips):
(unless (or noninteractive
emacs-quick-startup
(not (display-graphic-p))
(not (fboundp 'x-show-tip)))
(tooltip-mode 1))
The last 2 conditions is what you are looking for. This is much
cleaner, as no OS names are mentioned, just the functionality you need
for the call you are about to make.
> But how do you check whether configure was invoked with `--without-x'
> from Lisp and from C?
See above: find some related C function with Lisp binding that is only
compiled in when X support is enabled, and test for it with fboundp.
That's for Lisp code; for C, Jan showed you the way.
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