linking virtual class 1

[jstreich]

I'm compiling with g++, and I have a abstract class:

class listener
{
  public:
    listener(){}
    virtual ~listener(){};
    virtual void actionPerformed(void* event,void* actor)=0;
  private:
    listener(const listener& l){}
};

when I try to compile it into a project I get an object file, but when compiling and linking I get:

listener.o: file not recognized: File format not recognized
collect2: ld returned 1 exit status

I'm compiling using:

g++ -c -g joystick.c -o joystick.o
g++ -c -g serial.c -o serial.o
g++ -c -g listener.h -o listener.o
g++ -c -g jslistener.c -o jslistener.o
g++ -c -g xbeejslistener.c -o xbeejslistener.o
g++ -c -g driver.c -o driver.o
g++ driver.o xbeejslistener.o jslistener.o serial.o joystick.o listener.o -o joydriver

What am I doing wrong?

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[xwb]

Try changing .h to either .cpp or .cxx. g++ is actually a wrapper for gcc.

 

[sedawk]

you can also try to use -x option so that .h or .hpp can be read.

 

[ArkM]

Better don't compile .h files separately, especially .h files with class definitions only (it does not matter abstract or concrete). No need to do that at all.