Re: Retrieving the "include" directory for Emacs Modules

[Rudolf Schlatte <rudi@constantly.at>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Marco Antoniotti <marcoxa@gmail.com>
>> Date: Mon, 9 Dec 2024 10:58:57 +0100
>> 
>> On my Mac, If I install emacs as a "formula" (i.e., not a s an app) things
>> seem installed as they should be.  OTOH the brew "cask" (which installs a
>> .app in the Application directory) seems to create something that Apple
>> likes, but that STILL may be told to have a pointer to the include
>> directory as it does to the data-directory.
>> 
>> This is obviously something that the brew folks should deal with, but the
>> notion of having a variable that tracks the include directory still has
>> merit.  At least as an extra guideline to people like the brew maintainers.
>
> As I tried to explain, if emacs-module.h is not installed in its
> intended place, we cannot know where it is installed.  We only know
> that from the default installation locations we have in our Makefiles,
> but if some distros modify that, we cannot know.
>
> And I still contend that the correct installation should put this file
> where all the other header files are, and then the compiler will
> always find it.  Users who don't want to fight the uphill battle
> against brew could simply copy the file to the compiler's include
> directory, and be done.

`make install' for the nextstep backend produces Emacs.app, a
self-contained bundle that can be double-clicked to start Emacs but is
also a directory that contains the standard Emacs files inside, as
Emacs.app/Contents/Resources/{etc,include,info,lisp,man,site-lisp,...}.

I guess this is the case that Marco encounters: C-h N opens
<wherever>/Emacs.app/Contents/Resources/etc/NEWS, so the running Emacs
must have some knowledge about where it is installed.