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_mfence问题请教



在Linux下编译K2例程,修改了很多错误,最后在生成.out文件的时候出现如下错误:

undefined first referenced
symbol in file
--------- ----------------
_mfence ./src/K2_Navigator_init_drv.obj

编译时存在如下警告:

warning #225-D: function "_mfence" declared implicitly

请问,如何处理?