H8/300 Options - Using the GNU Compiler Collection (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, 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.