bug#46790: 28.0.50; make install with native-comp branch

[Andrea Corallo via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Andrea Corallo <akrl@sdf.org>
>> Cc: Thierry Volpiatto <thievol@posteo.net>, 46790@debbugs.gnu.org
>> Date: Sat, 10 Apr 2021 06:57:26 +0000
>> 
>> Thierry, are you specifying your custom bindir only when installing or
>> also while building?  If the case is the first could you please try
>> again setting bindir also while building?
>
> I don't think this can fly.  "make FOOdir=FOO" is a paradigm for
> installing parts of Emacs in specified directories without rebuilding.
>
> I think if we want to support this, the PATH_REL_LOADSEARCH trick is
> incorrect: we need to look for native-lisp directory relative to
> PATH_LOADSEARCH, i.e. relative to where the Lisp files are installed.
> Is this possible?
> The part that worries me is that we need to find
> these *.eln files very early during the process of restoring from the
> pdumper file, where we don't yet have all the directories handy.

I share your same worries (almost certainties here).

  Andrea