* Szabolcs Nagy <nsz@port70.net> [2017-06-18 21:11:04 +0200]:
> > > > +1:	strb  r2, [r0], #1
> 
> it seems strb with postindex+writeback is armv6t,
> so does not work in armv4t, i'll send an updated patch.
> 

now i checked with all arch and thumb combinations
and gas accepts the new patch with them.