Re: Treesit says grammar is unavailable when it

[Yuan Fu <casouri@gmail.com>]

On 12/4/23 4:43 AM, Gernot Kieseritzky wrote:
> Hello!
>
>> Warning (treesit): Cannot activate tree-sitter, because language grammar
>> for python is unavailable (not-found): (libtree-sitter-python libtree-sitter-python.so)
>> No such file or directory
> I had the same error when using "libtree-sitter-yaml.so" and, finally,
> had some time for a deeper investigation. I tried the Emacs built-in
> debugger (M-x debug-on-entry treesit_load_language) but I found the
> error only occurs inside the C function "treesit-available-p". Since
> this error occurred directly when Emacs loads the shared library
> resting inside of my ".emacs.d/tree-sitter/" directory I resorted to
> debugging the dynamic linker by starting Emacs with
>
> $ LD_DEBUG=1; emacs 2> linker.log
>
> and then just proceeded to activate "yaml-ts-mode". Then I hit this:
>
> listdc++.so.6: error: version lookup error: version 'GLIBCXX_3.4.29'
> not found (required by ~/.emacs.d/tree-sitter/libtree-sitter-yaml.so)
>
> Turns out the yaml module is using C++ for its scanner component (see
> https://github.com/ikatyang/tree-sitter-yaml) unlike all the other
> plugins I am using (C, C++, JS and TS). But I compiled this module on
> my own -- on the same machine -- so how can my system's C++ standard
> library suddenly turn incompatible??
>
> Well, it turns out I am using Alex Murray's Emacs snap package on my
> Ubuntu 22.04 system being based on the "core20" snap base package
> (i.e. it is based on Ubuntu 20). So this Emacs snap provides an older
> set of build essentials including an incompatible C++ standard
> library. So as a workaround I would need to cross-compile this module
> using an Ubuntu 20 compatible environment. But the best solution is
> probably to ask Alex Murray to add all available tree sitter parsers
> in his snap.
>
> Best regards,
> Gernot Kieseritzky

Thanks for sharing this! Eli, this sort of thing might be good reasons 
to also print the error message from ldopen, rather than simply saying 
not found?

Yuan