Compilation on 64-bit fails:
src\mame\machine/snesrtc.c(165) : warning C4305: '+=' : truncation from 'int' to 'UINT8'
src\mame\machine/snessdd1.c(680) : warning C4333: '>>' : right shift by too large amount, data loss
src\emu\cpu\superfx\superfx.c(537) : warning C4098: 'superfx_mmio_write' : 'void' function returning a value