restrictions for compiler code

[Rémi Thebault via digitalmars-d-ldc]

Hello all

I'd like to contribute D code to LDC, but I don't know what
restrictions apply in the compiler code.

 - is it allowed to link to Phobos?
 - is it allowed to link to Druntime?
 - is it allowed to link to external D libraries that meet the 2 above
restrictions?

Thanks
Rémi