[bug#47187] [PATCH] gnu: Add c-lightning.

["Léo Le Bouter via Guix-patches via" <guix-patches@gnu.org>]

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Hello!

> Okay.
> 
> It is somewhat unclear to me however how to discover where the
> library is located.
> As far as I understand how autotools does it, it looks at some
> standard locations on `/`, but I am uncertain if that is how it
> actually works.
> 
> For example if `libwally-core` is separately packaged, obviously it
> would install into a `/gnu/store/*` via a `--prefix` override.
> And if the dependent package were using autotools, it is somehow able
> to magically find where the `lib*.a` file is.
> However, C-Lightning does not actually use autotools (its build
> system predated my participation, I offered to port to autotools but
> this was declined), so I somehow need to emulate what autotools does
> in `--use-system-libraries` mode.
> 
> I probably have to go hack some autotools package that trivially
> depends on `libwally-core` and see what the exact shell script is
> generated.

pkg-config if your deps provide .pc files! Otherwise I am actually not
sure of the lookup strategies.

> Note that AFAIK the Python bindings do not actually invoke any of the
> C-Lightning binaries, they just open the UNIX socket to the c-
> lightning daemon, so I think there is no need for `c-lightning`
> itself as an input.

Alright!

> Regards,
> ZmnSCPxj

Léo

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