Highlight some #if XXX ... #endif to comment

[Freed-Wu]

Is it possible to highlight the following code to comment?

#if 0
XXX
#endif

Moreover, if compile_command.json define -DFOO, can we highlight the following code to comment?

#ifundef FOO
XXX
#endif

[Freed-Wu]

And the following XXX should also be specially highlighted.

int main() {
    return EXIT_SUCCESS;
  XXX
}

[HighCommander4]

What clangd version are you using, and what client?

[Freed-Wu]

clangd 14.0.6 and coc-clangd

[HighCommander4]

Clangd 14 produces comment semantic tokens for inactive preprocessor branches.

The appearance for a particular kind of semantic token is configured on the client side. I'm not sure how to configure it for coc-clangd, you can ask about this at https://github.com/clangd/coc-clangd/issues. Note that https://github.com/clangd/coc-clangd#configurations suggests that semantic highlighting in general needs to be enabled using semanticTokens.enable.