Re: Clang c++ include path

[Protonmail Bridge]

So here’s my naive suggestion:

We should have a MAKE-CLANG-TOOLCHAIN procedure that, given a clang package, a 
libc package, and a libc++ package (either libc++ or libstdc++), returns a 
fully-working clang toolchain.

I did encounter some problems while attempting this as you can see here: 
https://lists.gnu.org/archive/html/bug-guix/2019-11/msg00042.html

As Mathieu pointed out in that thread, the problem is probably that clang 
cannot find libstdc++ headers.

My first instinct is to use C{,PLUS}_INCLUDE_PATH and friends to solve this, 
but I remember trying this and it not working… Perhaps this needs to be a flag 
at compile/configure time for clang?

By the way, getting clang to work is the last piece I need to get Bitcoin Core 
release builds fully working on Guix, so I’ll be focusing on this and would 
appreciate any help I can get from you wizards!

Cheers,
Carl Dong