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undefined reference to `SetPduPowerConsumptionCnt'錯(cuò)誤的解決方法

更新時(shí)間：2013年07月26日 09:30:51 作者：

編譯時(shí)出現(xiàn)undefined reference to `SetPduPowerConsumptionCnt'錯(cuò)誤要如何解決呢？有沒(méi)有什么好的解決方法？下面小編就為大家解答吧，如果你也遇到了這種情況，可以過(guò)來(lái)參考下

問(wèn)題：
程序模型用C++語(yǔ)言編寫(xiě)，在程序模型和調(diào)用函數(shù)之間添加了一個(gè)接口文件modelc.cpp，用來(lái)讓用c語(yǔ)言程序調(diào)用程序模型中的函數(shù)；

新添加了兩個(gè)函數(shù)setPduPowerConsumptionCnt()和setPduPowerConsumptionTot()，用來(lái)清除PDU模型中的總功耗和功耗計(jì)數(shù)器；

編譯時(shí)出現(xiàn)錯(cuò)誤提示：

復(fù)制代碼代碼如下:

dingq@wd-u1110:~/hwsvn/2sw/1prj_linux/pdu/src/branches/pdu-isocket$ make clean;make
rm -f *.o pdu
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c main.cpp -o main.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c model.cpp -o model.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c modelc.cpp -o modelc.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c IniFile.cpp -o IniFile.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c ClientSocket.cpp -o ClientSocket.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c Thread.cpp -o Thread.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c SensorReader.cpp -o SensorReader.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c LcdWriter.cpp -o LcdWriter.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c Monitor.cpp -o Monitor.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c Helper.cpp -o Helper.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c Mutex.cpp -o Mutex.o
arm-linux-g++ -g3 -Wall -o0 -I../../../tools/eldk42/arm/usr/include/ -I../../../tools/eldk42/arm/usr/include/C++/4.2.2/ -c serial.cpp -o serial.o
arm-linux-gcc -g3 -Wall -o0 -c frm_package.c -o frm_package.o
arm-linux-gcc -g3 -Wall -o0 -c nettrans.c -o nettrans.o
arm-linux-gcc -g3 -Wall -o0 -c sensor-att7053.c -o sensor-att7053.o
arm-linux-g++ -L../../../tools/lib/ -lpthread -o pdu main.o model.o modelc.o IniFile.o ClientSocket.o Thread.o SensorReader.o LcdWriter.o Monitor.o Helper.o Mutex.o serial.o frm_package.o nettrans.o sensor-att7053.o
sensor-att7053.o: In function `reset_EnergyPort':
/home/dingq/hwsvn/2sw/1prj_linux/pdu/src/branches/pdu-isocket/sensor-att7053.c:83: undefined reference to `SetPduPowerConsumptionCnt'
/home/dingq/hwsvn/2sw/1prj_linux/pdu/src/branches/pdu-isocket/sensor-att7053.c:92: undefined reference to `SetPduPowerConsumptionTot'
collect2: ld returned 1 exit status
make: *** [pdu] Error 1

解決辦法：
1. 忘了在modelc.cpp的函數(shù)實(shí)現(xiàn)中添加extern "C"了。

復(fù)制代碼代碼如下:

extern "C" int setPduPowerConsumptionCnt(int index, unsigned int val) {
if (index > 8 || index < 1) {
printf("Error: The index available is between 1 and 8.\n");
return -1;
}
model->Channels()[index-1].TheEnergyPort().SetPowerConsumptionCount(val);

return 0;
}

添加之后，再次編譯，錯(cuò)誤仍然存在。
查找了半天，原來(lái)頭文件modelc.h中和實(shí)現(xiàn)文件modelc.cpp中的函數(shù)名差了一個(gè)符號(hào)，頭文件中是小寫(xiě)的s，setPduPowerConsumptionCnt，而實(shí)現(xiàn)文件中用了大寫(xiě)的S，SetPduPowerConsumptionCnt；而使用vim編輯器時(shí)，沒(méi)有設(shè)定區(qū)分大小寫(xiě)，導(dǎo)致沒(méi)有很容易一眼看出來(lái)。

修改之后，成功編譯。
問(wèn)題解決。