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[Default]

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This option specifies an instruction-set architecture for use in generating object files.

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When neither the -nofpu nor -fpu option has been selected, specifying this option automatically selects the -fpu option.

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Omitting this option when neither the -cpu option nor one of the environment variables (CPU_RX or ISA_RX) is specified will lead to an error.

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When the -cpu option and this option are specified simultaneously, an error will occur.