Compile-time appears undefined reference to ' setpdupowerconsumptioncnt ' error How to solve it? Is there any good way to solve it? The following small series for everyone to answer it, if you have encountered this situation, you can come to refer to the next
Problem:
The program model is written in C + + language, and an interface file Modelc.cpp is added between the program model and the call function, which is used to call the function in the program model with C language program.
A new addition of two functions setpdupowerconsumptioncnt () and Setpdupowerconsumptiontot () is used to clear the total power and power counter in the PDU model;
Error message at compile time:
Copy Code code as follows:
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
Solution:
1. Forget to add extern "C" to the Modelc.cpp function implementation.
Copy Code code as follows:
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;
}
After adding, compile again, and the error still exists.
Looking for a half-day, the original header file modelc.h and implementation file Modelc.cpp function name is a symbol, the header file is lowercase s,setpdupowerconsumptioncnt, and the implementation file with the capital of S, setpdupowerconsumptioncnt while using the Vim editor, there is no case sensitivity, resulting in no easy to see.
After modification, compile successfully.
Solve the problem.
