bug#50733: 28.0.1; project-find-regexp can block Emacs for a long time

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Dmitry Gutov <dgutov@yandex.ru>,  50733@debbugs.gnu.org,
>   mardani29@yahoo.es
> Date: Fri, 24 Sep 2021 10:02:36 +0300
> 
> > Btw, I don't understand why we focus on general-purpose text-searching
> > tools for these features.  Why not focus on packages like ID Utils
> > instead, they are so much faster.  Daniel, could you time the same
> > search in that large tree when xref-search-program is 'gid'?  (You'd
> > need to run 'mkid' first, to create the ID database, but that is
> > one-time, and is very fast.)  As I told many times, I think this is
> > the future: program language sensitive tools that use a precomputed
> > DB.
> 
> While we have the make target `make tags` that generates the tags database
> in the Emacs source tree, for trying to use ID Utils I can't find
> a similar target that would create the ID database.

We can easily add it.

> Is its command line more complex than etags?

No, it's much more simple.  Assuming you are in the top-level
directory of the Emacs source tree, the command is just:

     mkid

That produces a file named 'ID' in that directory.