Cross compiler for embedded microcontrollers ?

[Jens Bauer via Digitalmars-d]

Hi,

Today is my first D-day. I haven't even written any d-code yet,
but I've got the compiler for my PPC-based Mac (yes, it's old).

I'm familiar with compiling toolchains for ARM Cortex-M0, M3 and
M4.
Is there any information on how to build a cross-gdc targetting
these architectures ?

Eg. the compiler will be built and run on my PowerMac, but I'd
like it to generate ARM Cortex-M3 code for instance.