Can't compile matcreat.cpp in linux

I can't successfully compile the example file: matcreat.cpp (provided by mathworks.) I am running linux centOS 5.6 and am using g++ version 4.1.2. My matlab version is 2010a and I am on a 64-bit machine.

I can, however, successfully compile and run matcreat.c using gcc.

The command I use to compile is:

   g++ -o ~/m matcreat.cpp -I /usr/local/matlab2010a/extern/include/ -L /usr/local/matlab2010a/bin/glnxa64/ -lmat -lmx

Here are the errors I get when using g++ to compile matcreat.cpp

      /usr/local/matlab2010a/bin/glnxa64//libmx.so: 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)@GLIBCXX_3.4.9'
/usr/local/matlab2010a/bin/glnxa64/libut.so: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::basic_ostream<char, std::char_traits<char> >::_M_insert<void const*>(void const*)@GLIBCXX_3.4.9'
/usr/local/matlab2010a/bin/glnxa64/libmwfl.so: undefined reference to `std::bad_alloc::what() const@GLIBCXX_3.4.9'
/usr/local/matlab2010a/bin/glnxa64/libmwfl.so: undefined reference to `std::basic_istream<char, std::char_traits<char> >& std::basic_istream<char, std::char_traits<char> >::_M_extract<bool>(bool&)@GLIBCXX_3.4.9'
/usr/local/matlab2010a/bin/glnxa64//libmx.so: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::basic_ostream<char, std::char_traits<char> >::_M_insert<double>(double)@GLIBCXX_3.4.9'
/usr/local/matlab2010a/bin/glnxa64/libut.so: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::basic_ostream<char, std::char_traits<char> >::_M_insert<long>(long)@GLIBCXX_3.4.9'
/usr/local/matlab2010a/bin/glnxa64/libut.so: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::basic_ostream<char, std::char_traits<char> >::_M_insert<bool>(bool)@GLIBCXX_3.4.9'
/usr/local/matlab2010a/bin/glnxa64//libmx.so: undefined reference to `std::basic_ostream<char, std::char_traits<char> >& std::basic_ostream<char, std::char_traits<char> >::_M_insert<unsigned long>(unsigned long)@GLIBCXX_3.4.9'
collect2: ld returned 1 exit status

I would like write c++ code to read and write .mat files. Thanks! -- Michael

Answer 1

[Kaustubha Govind]

Have you tried compiling using the options file as described in the documentation: Building on UNIX Operating Systems. You are likely not linking against some additional C++ libraries.

[Michael]

Kaustubha,

No. I have not tried that but it appears that the options file is needed for the "mex" command which is run within matlab.

I'm trying to compile a c++ program from the bash shell.

I think you are right that I'm not linking in all needed libraries, but I can't see what else to link in. As you can see from my description above, I am linking in /usr/local/matlab2010a/bin/glnxa64/ -lmat -lmx

Am I still missing something?

Thanks for your help,

Michael

[Kaustubha Govind]

Michael: If you follow the MEX command with the -v option, you will see the exact compiler/linker commands that are needed.

[Michael]

Dear Kaustubha,

Thank you for the answer.

I used the mex command as you suggested and saw the options. This lead me to see that I needed to use g++ version 4.3.4 instead of what I was using (version 4.1.2).

I changed compilers to g++ 4.3.4 and the mex function command worked and so does compiling from a bash shell with "g++".

Problem solved.

Thanks,

Michael