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Predefined preprocessor macros for m68k

GCC defines the following preprocessor macros for the Motorola m68k configurations.

Any Motorola m68k architecture:

__mc68000__

Any Motorola m68010 architecture:

__mc68010__

Any Motorola m68020 architecture:

__mc68020__

Any Motorola m68030 architecture:

__mc68030__

Any Motorola m68040 architecture:

__mc68040__

Any Motorola m68060 architecture:

__mc68060__

Any Motorola m68332 architecture:

__mc68332__

Any Motorola m68881 architecture:

__HAVE_68881__