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

[Ulrich Mueller]

>>>>> On Mon, 28 Aug 2023, Alan Mackenzie wrote:

>> >     (when (< emacs-major-version 24)
>> >       (defadvice .....))

>> I believe (eval-when-compile (< emacs-major-version 24)) would work?

> I've twisted my head into knots in the past trying to work out how to
> use eval-when/and-compile for this purpose.  The point is, I don't want
> the defadvice to be evaluated at compile time; I just want it to be
> compiled (or not).

Sorry, I should have been clearer. The full construct would look like
this:

    (when (eval-when-compile (< emacs-major-version 24))
      (defadvice .....))

So only the test would be evaluated at compile time, the defadvice
itself would be compiled normally (or not, if the test fails).