GNU bug report logs - #52147
Eager macro-expansion is not performed in `eval-and-compile' functions

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Message #19 received at 52147 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 52147 <at> debbugs.gnu.org, Paul Pogonyshev <pogonyshev <at> gmail.com>
Subject: Re: bug#52147: Eager macro-expansion is not performed in
 `eval-and-compile' functions
Date: Mon, 29 Nov 2021 20:14:51 +0100

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> We usually don't stress a lot about the performance of interpreted
> (i.e., uncompiled) code.

Well we do, a bit,

  (info "(elisp) How Programs Do Loading")

says that loading a file performs eager macro expansion and that does
speed up the resulting code.  `eval', `eval-when-compile' and
`eval-and-compile' don't perform eager macro expansion.  I don't know to
what degree this is on purpose.  But if a macro is defined later in the
file or in another file that has not yet been loaded this may not be
possible anyway.

Michael.

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