导入最基本的GPIO项目，编译报了好多警告，求解决
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?_PORT1CFG?GPIO
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?_PORT3CFG?GPIO
*** WARNING L15: MULTIPLE CALL TO SEGMENT
SEGMENT: ?PR?PRINTF?PRINTF
CALLER1: ?PR?GPIOINTERRUPT?GPIO
CALLER2: ?C_C51STARTUP
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: MINITSTDIO
MODULE: Main.obj (MAIN)
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: _MDELAYMS
MODULE: Main.obj (MAIN)
*** WARNING L1: UNRESOLVED EXTERNAL SYMBOL
SYMBOL: CFGFSYS
MODULE: Main.obj (MAIN)
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: CFGFSYS
MODULE: Main.obj (MAIN)
ADDRESS: 04AFH
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: _MDELAYMS
MODULE: Main.obj (MAIN)
ADDRESS: 04B6H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: MINITSTDIO
MODULE: Main.obj (MAIN)
ADDRESS: 04B9H
*** WARNING L2: REFERENCE MADE TO UNRESOLVED EXTERNAL
SYMBOL: _MDELAYMS
MODULE: Main.obj (MAIN)
ADDRESS: 04E0H
前面2个是未调用的警告，没影响；
后面的错误调用了未声明的函数，工程里面包含DEBUG.C就可以了；
这种类似的错误，百度一下解释很详细，建议下次可以直接百度或者直接邮件技术支持 lb@wch.cn。
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