Experimental Physics and
Industrial Control System

    I am writing to see if you could help us with the following problem we have. After making a merge between an old version and a new one (our c++ code) that now uses EPICS 7 (7.0.6.2-DEV), we get a compilation error in the linking process, that is, the library compiles correctly but when we try to compile the examples we get the error "libgiapi-glue-cc. so: undefined reference to `epics::pvDatabase::PVDatabase::addRecord(std::shared_ptr<epics::pvDatabase::PVRecord> const&)'"".

     Analysing the built library (libgiapi-glue-cc.so.0.16) to see the symbols defined, we have used the nm tool. We can see that the addRecord function requires the std::shared::ptr parameter (it must be defined in the libpvDatabase.so.4.6.1 library). The output of the nm command is copied below.
 nm --format sysv libgiapi-glue-cc.so.0.16 | c++filt | grep addR
epics::pvDatabase::PVDatabase::addRecord(std::shared_ptr<epics::pvDatabase::PVRecord> const&)| | | U | NOTYPE| | |*UND*

     Now, if we analyze the EPICS library libpvDatabase.so.4.6.1, we get that the "addRecord" function requires the parameter std::tr1::shared_ptr instead of std::shared_ptr. The output of the nm command is copied below.
epics::pvDatabase::PVDatabase::addRecord(std::tr1::shared_ptr<epics::pvDatabase::PVRecord> const&)| |000000000004c120| T | FUNC|0000000000000370| | |.text

    If we analyze the source code, we can see that the PVImageRecordPtr type has been defined with std::tr1::shared_ptr. Below you can se the code extract or in the following link(https://github.com/framos-gemini/giapi-glue-cc/blob/peterMerge/src/data/PVImageAgent.h, line 136 and 250)

     class PVImageRecord;
      typedef std::tr1::shared_ptr<PVImageRecord> PVImageRecordPtr;
      PVImageRecordPtr pvImageRecord;

     Next, the PVImageRecord class inherits from the epics::pvDatabase::PVRecord class, which defines the create method. Below is a small fragment of the code: (https://github.com/framos-gemini/giapi-glue-cc/blob/peterMerge/src/data/PVImageAgent.cpp).

  class PVImageRecord: public epics::pvDatabase::PVRecord {
  public:
      POINTER_DEFINITIONS(PVImageRecord);
      static PVImageRecordPtr create(std::string const & recordName, LoggerPtr lg)

      In the same PVImageAgent.cpp file, line 606, is where the record is introduced. As you can see, the addRecord function is being called with the std::tr1::shared_ptr type (PVImageRecordPtr pvImageRecord) instead of std::shared_ptr. Therefore, it is strange what is happening. Any suggestions?

       Thank you in advance and also for the good responses that have allowed us to move forward.