[ruby-core:109957] [Ruby master Feature#19011] Improve LSP support in CRuby development itself

Issue #19011 has been reported by tenderlovemaking (Aaron Patterson).

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Feature #19011: Improve LSP support in CRuby development itself
https://bugs.ruby-lang.org/issues/19011

* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Priority: Normal
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I would like to add a new configure option for improve working with language servers inside CRuby itself.

The summary is like this:

```
$ ./autogen.sh
$ ./configure --enable-compile-commands
$ make -j compile_commands.json
# Now use LSP
```

`clangd` uses `compile_commands.json` to understand how to compile files inside CRuby.  We can use `clang` itself to generate this file, but we have to pass special compile options to clang.  Unfortunately the compile options generate many small JSON files, so we also need a way to concatenate them in to `compile_commands.json`.

Ideally I would like `make miniruby` to build `miniruby` *and* `compile_commands.json`, but I don't know how to do that yet. 

I've send a patch [here](https://github.com/ruby/ruby/pull/6352)



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