bug#66575: [PATCH] Gud lldb support

[Mattias Engdegård]

> No MI support, because lldb-mi is no longer part of LLVM.

So what is the currently blessed way to communicate with LLDB?

I only have comments about trivialities here; someone else should deal with the 
serious stuff.

> +(eval-when-compile (require 'rx))

There is usually no need to import rx explicitly. The necessary macros and 
functions are autoloaded.

> +;; because gud-symbol uses their values if they are present.  Tehir
> +;; names are deducded from the minor-mode name.

'Their', 'deduced'.

> +         ;;     frame #0: ...) at emacs.c:1310:9 [opt]
> +         (string-match (rx (and line-start (0+ blank) "frame"
> +                                (0+ not-newline) " at "
> +                                (group (1+ (not (any ":"))))
> +                                ":"


(You can write (not ":") instead of (not (any ":")) if you like.)
If the file name can have an absolute directory part, then it may run into 
trouble on Windows (C:\Some\Dir\File.c).

Sad that we throw away the column number here, but perhaps that's just a 
limitation of gud.el.

Anyway, a big step up from not having any support at all. Thank you!

Would you include a NEWS entry as well?