What endiannesses do D support?

[Alex Rønne Petersen]

On Friday, 4 October 2013 at 10:59:05 UTC, Denis Shelomovskij 
wrote:
> Some of druntime/phobos code assumes it is one of little/big 
> endianness others have `static assert(0)` for third case. Lets 
> clear the situation and make a decision.

Little endian and big endian must be supported. Little endian 
PowerPC, for example, is extremely rare (if not entirely 
extinct), so just supporting little endian is not enough.