How to build a set of toolchains for cross-compiling for LDC?

[Majestio via digitalmars-d-ldc]

Hi all!

I apologize in advance for my English, I use Google Translator :-\

I became interested in the D programming language recently. I 
want build a comfortable environment for cross-compilation. In my 
Linux Funtoo already has a similar environment for C/C++ based 
http://mxe.cc:

i686-w64-mingw32.shared
i686-w64-mingw32.static
x86_64-w64-mingw32.shared
x86_64-w64-mingw32.static

... and more libs, including Qt 5.4.2 for each toolchain.

So far I have built native LDC, and native "Hello world" is 
compiled and linked successfully.

Actually, the question is how to build step by step for the 
environment LDC for  cross-compile, similar MXE?

Just in case, my directory structure:

/home/majestio/dev/cross/mxe - C/C++ cross-compile env
/home/majestio/dev/cross/llvm - LLVM,Clang,LDC

WBR