Answer my own question: it seems that an explicit mention ofphobos also brings in druntime so now linking works (new to this: thought those were two separate things).
- linking druntime in when C calls D and C implements main() Carl Sturtivant
- Re: linking druntime in when C calls D and C implemen... Carl Sturtivant
- Re: linking druntime in when C calls D and C impl... Johannes Pfau
- Re: linking druntime in when C calls D and C ... Carl Sturtivant
