These -m options are defined for the H8/300 implementations:
-mrelax
-relax. See ld and the H8/300, for a fuller description.
-mh
-ms
-ms2600
-ms.
-mint32
int data 32 bits by default.
-malign-300
-malign-300 causes them to be aligned on 2 byte boundaries.
This option has no effect on the H8/300.