Mex error. Collect2 -lstdc++

Question

Jonathan Sullivan 2012-4-2

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Hey. I'm trying to compile a mex function, and I'm having a little trouble. Any help would be appreciated.

The command is

mex('-DDEFINEUNIX','-largeArrayDims','mtimesx.c','/usr/lib64/libblas.so.3.2.1')

and the error I'm getting is:

Warning: You are using gcc version "4.4.0".  The version
       currently supported with MEX is "4.3.4".
       For a list of currently supported compilers see: 
       http://www.mathworks.com/support/compilers/current_release/
mtimesx.c: In function ‘mexFunction’:
mtimesx.c:592: warning: assignment discards qualifiers from pointer target type
/usr/bin/ld: cannot find -lstdc++
collect2: ld returned 1 exit status
    mex: link of ' "mtimesx.mexa64"' failed.exa64"' failed.

Any thoughts on what might be going wrong?

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Answer 1

Ken Atwell 2012-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/34304-mex-error-collect2-lstdc#answer_43092

What Linux distro are you running? I'll ignore the warns and address the link error:

It looks like the g++ libraries are not installed on your system, and MATLAB needs to them to link. Yes, you are "only" using C and not C++, but the MATLAB libraries you link against require C++ libraries.

In short, you'll want to install the "gcc-g++" package, or something with a similar name, depending on the distribution you are using.