Predefined preprocessor macros for m68k

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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__

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