undefined referance to LibSerial

c++, g++, linker-errors, posix, serial-port

Solution

This is the linker complaining that it cannot find the functions referenced by the libserial header file.

If I look on my Linux system to see how the shared library is called:

$ dpkg -L libserial0
...
/usr/lib/libserial.so.0.0.0
/usr/lib/libserial.so.0

On my system this implies I would add `-lserial` as a g++ option (aka link with libserial.so) this would turn your compilation command into

g++ -Wall -lserial -o gen1 gen1.cpp string2num.o

Problem

So i'm writing a serial transmision program, and have just changed over to using C++, it been a while since I used C++ (I've been working with C recently, and before that java) Now I need to use LibSerial, (it seems much simpler to use than C's termios) my code is: ``` //gen1.cpp #include "string2num.h" // a custom header #include <iostream> #include <SerialStream.h> using namespace LibSerial; //using namespace std; int main(int argc, char*argv[]) { if (argc<2) { std::cout<<argv[0]<<"requires the device name eg \"dev/tty0\" as a parameter\nterminating.\n"; return 1; } SerialStream theSerialStream(argv[1]); //open the device return 0; } ``` When I compile the output: ``` g++ -Wall -o gen1 gen1.cpp string2num.o /tmp/cchPBWgx.o: In function `main': gen1.cpp:(.text+0x121): undefined reference to `LibSerial::SerialStream::SerialStream(std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::_Ios_Openmode)' /tmp/cchPBWgx.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[vtable for LibSerial::SerialStreamBuf]+0x24): undefined reference to `LibSerial::SerialStreamBuf::showmanyc()' /tmp/cchPBWgx.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[vtable for LibSerial::SerialStreamBuf]+0x28): undefined reference to `LibSerial::SerialStreamBuf::xsgetn(char*, int)' /tmp/cchPBWgx.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[vtable for LibSerial::SerialStreamBuf]+0x2c): undefined reference to `LibSerial::SerialStreamBuf::underflow()' /tmp/cchPBWgx.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[vtable for LibSerial::SerialStreamBuf]+0x34): undefined reference to `LibSerial::SerialStreamBuf::pbackfail(int)' /tmp/cchPBWgx.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[vtable for LibSerial::SerialStreamBuf]+0x38): undefined reference to `LibSerial::SerialStreamBuf::xsputn(char const*, int)' /tmp/cchPBWgx.o:(.rodata._ZTVN9LibSerial15SerialStreamBufE[vtable for LibSerial::SerialStreamBuf]+0x3c): undefined reference to `LibSerial::SerialStreamBuf::overflow(int)' collect2: ld returned 1 exit status make: *** [gen1] Error 1 ```

Original source