Re: Why shouldn't we have a #if .... #else .... #endif construct in Emacs Lisp?

[tomas]

On Mon, Sep 04, 2023 at 10:50:07AM +0000, Alan Mackenzie wrote:
> Hello, Richard.
> 
> On Sun, Sep 03, 2023 at 21:34:08 -0400, Richard Stallman wrote:
> > [[[ To any NSA and FBI agents reading my email: please consider    ]]]
> > [[[ whether defending the US Constitution against all enemies,     ]]]
> > [[[ foreign or domestic, requires you to follow Snowden's example. ]]]

[...]

> >   > > How about making the byte compiler recognize the construct
>  
> >   > >  (if (< emacs-major-version NUMBER) ...)
> 
> >   > > and do this optimization on it?

[...]

>   (static-if (fboundp 'electric-indent-local-mode) ; Emacs 24.4 or later.
>     (electric-indent-local-mode (if c-electric-flag 1 0)))
> 
> ..  (hash-if has been renamed static-if.)  It would be more work to
> replace it with
> 
>   (when (or (> emacs-major-version 24)
>             (and (= emacs-major-version 24)
>                (>= emacs-minor-version 4)))
>     (electric-indent-local-mode (if c-electric-flag 1 0)))

Besides, a feature test is almost always better than a version test,
because it actually documents what the tester cares about.

Cheers
-- 
t

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