用这个共用体，却报如下错误是什么原因啊，谢谢！
union {unsigned long All_time;unsigned char time[4];}Total_time;
C:Program Files (x86)Microchipxc8v1.41sourcescommonUmul32.c:15: advisory: (1510) non-reentrant function "___lmul" appears in multiple call graphs and has been duplicated by the compiler
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