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请问_addf、_mpyf等函数怎么用？

Mr.Night
Intellectual 495 points


q请问，在使用_addf，_mpyf等函数的时候，提示无法识别是怎么回事？

#20 identifier "__c6xabi_addf" is undefined

#20 identifier "__c6xabi_mpyf" is undefined

用的是C6678，添加了c6x.h 和 math.h都没用，请问是怎么回事呢？