Cannot link with libphobos2.a with GCC 6.2 on Ubuntu 16.10

[Nordlöw via Digitalmars-d-learn]

On Thursday, 13 October 2016 at 19:01:55 UTC, Nordlöw wrote:
> Can I bootstrap DMD or do I need to cross-compile to the new 
> PIE/PIC?

Is this what AUTO_BOOTSTRAP=1 is for and what does it do?