gcc -I -L -l -D

• -I"path" include the header path

• -L"path" include the dynamic path or static path

• -llibname include the library name, without lib prefix.

you can specify the dynamic library in the LD_LIBRARY_PATH as well.

• -D add individual macro definition.
  such as main.cpp:

int main()
{
    int a=0,b=1;
    int c=a+b;

  #ifdef DEBUG
      cout<<"result = "<<c<<endl;
 #endif
return c;
}

You can generate verbose version program using

g++ main.cpp -o main -DDEBUG