Originally posted by: Eshw157

Hi,

I'm getting a lot of undefined references while building a c++ application that uses CPLEX concert technology in Linux. It happens with building the example blend.cpp too. Have copied a few lines below.

../opt/ibm/ILOG/CPLEX_Studio126/concert/lib/x86-64_linux/static_pic/libconcert.a(ilosolution.o): In function `IloSavedIntSetVarI::display(std::basic_ostream<char, std::char_traits<char> >&) const':
ilosolution.cpp:(.text+0xa79d): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)'
ilosolution.cpp:(.text+0xa7f9): undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)'
 

Could you please help?

Thanks.

Have you included -DIL_STD as one of your compiler options?  Are you using the makefiles that are included with the installation?  See the <COS_INSTALL_DIR>/cplex/readmeUnix.html file.  The example makefile lives at <COS_INSTALL_DIR>/cplex/examples/x86-64_linux/static_pic/Makefile (for 64-bit Linux on Intel) and contains the "Compiler options" and "Link options" sections.

Originally posted by: Eshw157

Thanks for the reply.

Yes, I have included the compiler option. I'm somewhat familiar with the compiler and link options because I was running my application with CPLEX before successfully. I moved to a different computer, did the installation again and I can't get it running.

And, for blend.cpp I used the makefile that came with the installation.

Do I have to install a higher version of g++?

Thanks.

What version of g++ do you have?  According to the system requirements you need 4.3.4 (click on the Linux link and then the "Supported Software" tab).

Originally posted by: Eshw157

Sorry for the delayed response. 

I was having an older version of g++ and the problem was due to that. Your reply was really helpful. Thank you.