bug#69952: [PATCH] Support pdumping compiled queries by dumping their source

[Eli Zaretskii <eliz@gnu.org>]

> From: Yuan Fu <casouri@gmail.com>
> Date: Sun, 21 Apr 2024 23:04:47 -0700
> Cc: Daniel Colascione <dancol@dancol.org>,
>  serg.foo@gmail.com,
>  69952@debbugs.gnu.org
> 
> >> No. You need both tree-sitter library and the grammar library.
> > 
> > That's what I thought.  So starting Emacs in that case will attempt to
> > call a function from the tree-sitter library, and will segfault,
> > right?  If so, we should have some protection in the code in
> > pdumper.c that loads queries, which tests that tree-sitter is
> > availabale, and if not does something to prevent the segfault, like
> > not loading the query, perhaps?
> 
> Right, it can use Ftreesit_available_p (we can define a C equivalent if pdumper can’t call lisp), and decide whether to compile the query or just keep the query as a string, or signal an error?

We cannot safely signal an error at that point, I think, so just
keeping the query as a string should do, as it will then signal an
error at run time when that query is used, is that right?