@requiem I'm assuming you're rewriting the pvm interpreter in C?
Also, for the 8-bit targets, there are several options I think. For the 6502, there is cc65 or Calypsi, which @mos_8502 brought to my attention recently. For Z80, some traffic on the RC2014 mailing list indicates people have gotten the CP/M HiTech C compiler working. Its dialect predates C89 though, IIRC.