info gcc

These ‘-m’ options are defined for the H8/300 implementations:

-mrelax: Shorten some address references at link time, when possible; uses the linker option ‘-relax’. See ld and the H8/300 in Using ld, for a fuller description.
-mh: Generate code for the H8/300H.
-ms: Generate code for the H8S.
-mn: Generate code for the H8S and H8/300H in the normal mode. This switch must be used either with ‘-mh’ or ‘-ms’.
-ms2600: Generate code for the H8S/2600. This switch must be used with ‘-ms’.
-mexr: Extended registers are stored on stack before execution of function with monitor attribute. Default option is ‘-mexr’. This option is valid only for H8S targets.
-mno-exr: Extended registers are not stored on stack before execution of function with monitor attribute. Default option is ‘-mno-exr’. This option is valid only for H8S targets.
-mint32: Make int data 32 bits by default.
-malign-300: On the H8/300H and H8S, use the same alignment rules as for the H8/300. The default for the H8/300H and H8S is to align longs and floats on 4-byte boundaries. ‘-malign-300’ causes them to be aligned on 2-byte boundaries. This option has no effect on the H8/300.

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