linux-kernel - Re: clangd cannot handle tree

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Date:   Thu, 13 Apr 2023 21:16:01 -0400
From:   Joel Fernandes <joel@...lfernandes.org>
To:     rcu@...r.kernel.org, ndesaulniers@...gle.com, nathan@...nel.org,
        trix@...hat.com, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, paulmck@...nel.org
Subject: Re: clangd cannot handle tree_nocb.h

On Thu, Apr 13, 2023 at 9:11 PM Joel Fernandes <joel@...lfernandes.org> wrote:
>
> Hello,
>
> One way to fix this could be to add this to the beginning of tree_nocb.h
>
> /* Make clangd understand tree_nocb.h */
> +#ifdef CLANGD_PARSER_ACTIVE
> +#define TREE_NOCB_H_CLANGD
> +#include "tree.c"
> +#endif
>
> And then at the end of tree.c, do this to prevent recursion:
> +#ifndef TREE_NOCB_H_CLANGD
>  #include "tree_nocb.h"
> -#include "tree_plugin.h"
> +#endif
> +#include "tree_plugin.h"
>
> Then in scripts/clang-tools/gen_compile_commands.py, we can just make
> it add "-DCLANGD_PARSER_ACTIVE" to all compile command entries in the
> JSON file.
>

Ah and even that will not fully work, because there is no entry for
tree_nocb.h in compile_commands.json to begin with :-(. However, that
also can be fixed. Here's how:

We can just add metadata to tree_nocb.h , something like:
/* clangd_infer_from: tree.c */

Then we make scripts/clang-tools/gen_compile_commands.py  duplicate
the compile command JSON entry for tree.c but for tree_nocb.h.

Lastly, we add -DDCLANGD_PARSER_ACTIVE to all entries (including the duplicate).

 - Joel