On Friday, 8 February 2013 at 16:38:00 UTC, Iain Buclaw wrote:

I see we could be doing this all day. :þ

We could.

I'll lay down the hint, dmd compiles the source, not gcc. And although gcc
may be invoked during a certain special stage of compilation, its actually
just a driver to call a certain toolchain program that is outside of gcc.
:-)

What we're saying is that dmd, The Digital Mars D Compiler, is written in C++ and is thus built by GCC/G++. We can tell by looking at the Makefile that DMD doesn't build itself.