On Tue, Jul 18, 2017 at 2:30 PM, Jonathan Wakely <jwakely.gcc@xxxxxxxxx> wrote: > On 18 July 2017 at 09:33, sothy shan wrote: >> Hi, >> I am running g++-6 in UBuntu 16.04. I'm using open-source library to >> develop my application. >> >> >> In the third part library, there is only DTOR and no copy CTOR and >> copy assignment. >> So I created copy CTOR. The open source library is compiled. >> >> Now I am trying to compile my application. It gives error. >> >> g++-6 test2.cc -lfluid_msg -o test2 -g -fsanitize=address >> /tmp/ccEKzcOk.o: In function >> `fluid_msg::of10::PacketOut::PacketOut(fluid_msg::of10::PacketOut >> const&)': >> /usr/local/include/fluid/of10msg.hh:230: undefined reference to >> `fluid_msg::PacketOutCommon::PacketOutCommon(fluid_msg::PacketOutCommon >> const&)' >> collect2: error: ld returned 1 exit status >> >> I dont know why? When compiler creates automatically, it works. It >> means when I remove the copy CTOR, compilation goes well. >> >> I wish to know what is problem in linking? may be becasue of >> inheritance and copy CTOR.?? PacketOut is inherited from >> PacketOutCommon. I declare and defined copy CTOR in PacketOutCommon. > > You say you defined it, but the linker says it is not found. > > Where did you define it? Is it meant to be defined in libfluid_msg? > Did you rebuild that library? > > We can't help you without more information, because this doesn't look > like a GCC problem. You just need to compile the definition and ensure > you link to it. Yes. I already included definition into the libfluid_msg and compiled as seen below. ///// PacketOutCommon(const PacketOutCommon &other); PacketOutCommon& operator=(const PacketOutCommon &other); When I compile the my application, it gives compilation error. When I remove my changes, it works. It means compiler generated works. Based on the error, PacketOut researching for PacketOutCommon. Couldnt find. That is why I am guess problem with compiler. Am I right?
