Undefined reference to _d_throw

[Steve Teale]

>> Do I need to build both with the same compiler?
>
> Neither DMD, GDC or LDC are binary compatible with each other.

Thanks Jacob. My next linking problem is that I have lots of 
undefined externals relating to libpthread. I suspect this may be 
a CodeBlocks configuration error. I've tried every whichway but 
have not found a way round this yet. Most frustrating.