bug#70342: 29.3.50; treesitter and RTLD_GLOBAL

[Eli Zaretskii]

> From: Michael Lausch <mick.lausch@gmail.com>
> Date: Thu, 11 Apr 2024 20:47:50 +0200
> Cc: 70342@debbugs.gnu.org
> 
>  > A solution can be:
>  > 1) use a special call to dlopen without the RTLD_OPEN flag, sim,ilar to 
> what the eln loader does. 
>  > 2) fix all the grammars and make all functions 'static' so that the 
> functions are not visible outside the
>  > compilation unit. 
>  > 3) something i didn't think about
> 
>  If those 'serialize' functions are not needed to be called from
>  outside of the shared library, the usual way is not to export them,
>  i.e. to give all symbols except the few that need to be exported the
>  so-called "hidden visibility".
> 
> I agree that this would be the cleanest way to solve the problem, but that 
> would mean to patch all the existing
> grammars and maybe all the future grammars and push the changes to their 
> maintainers.
> 
> I started to prep patches for the yaml and org grammar (those were the ones 
> which triggered the bug for me)
> and i'm going to have them merged upstream. 

I understand, but why is this an Emacs problem?  We use RTLD_GLOBAL
for a reason, and the problem of not exposing unnecessary symbols
should be solved by the respective libraries and those who build them.