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3.21.19 H8/300 Options ¶

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 with either -mh or -ms.

-msx ¶

Generate H8SX code.

-ms2600 ¶

Generate code for the H8S/2600. This switch must be used with -ms.

-mquickcall ¶

Use registers for argument passing.

-mslowbyte ¶

Consider access to byte-sized memory slow.

-mexr ¶

-mno-exr

Store extended registers on the stack before execution of functions with the monitor attribute (see H8/300 Function Attributes). The default is -mexr. 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.