Question

求大侠解救！Keil编译出现警告DUANDIANBAOHU.C(135): warning C206: 'Stop': missing function-prototype

DUANDIANBAOHU.C(135): warning C206: 'Stop': missing function-prototype
linking...
*** WARNING L15: MULTIPLE CALL TO SEGMENT
SEGMENT: ?PR?_RDFROMROM?DUANDIANBAOHU
CALLER1: ?C_C51STARTUP
CALLER2: ?PR?INIT0?DUANDIANBAOHU
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: STOP
MODULE: duandianbaohu.obj (DUANDIANBAOHU)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: STOP
MODULE: duandianbaohu.obj (DUANDIANBAOHU)
ADDRESS: 02C5H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: STOP
MODULE: duandianbaohu.obj (DUANDIANBAOHU)
ADDRESS: 0254H
Program Size: data=33.0 xdata=0 code=770

Answer 1

*** WARNING L15: MULTIPLE CALL TO SEGMENT
SEGMENT: ?PR?_RDFROMROM?DUANDIANBAOHU
CALLER1: ?C_C51STARTUP
CALLER2: ?PR?INIT0?DUANDIANBAOHU

这是告诉你RdFromRom()这个函数既被普通函数调用也被中断函数调用，存在上下文紊乱的风险。一般应尽量避免。你可以将RdFromRom()函数复制一份改名为RdFromRomInt()专供中断调用。

*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: STOP
MODULE: duandianbaohu.obj (DUANDIANBAOHU)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: STOP
MODULE: duandianbaohu.obj (DUANDIANBAOHU)
ADDRESS: 02C5H

Stop函数未声明函数原型，也没有函数实体（其实也不一定是没有，可能是放到调用它的函数后面去了，导致编译时还不知道有这么个函数）。