How to tell mex to link with the libstdc++.so.6 in /usr/lib instead of the one in the MATLAB directory?

Solution 1:

/usr/lib/gcc/i686-linux-gnu/4.7/cc1plus: /usr/local/MATLAB/R2012a/sys/os/glnx86/libstdc++.so.6: version `GLIBCXX_3.4.15' not found

The problem is that when you are building with mex, it puts -L/usr/local/MATLAB/R2012a/sys/os/glnx86 on the link line, and so the linker picks up libstdc++.so from there.

If you can't convince mex to prepend -L/usr/lib/i386-linux-gnu first, then I think your only other choice is to remove /usr/local/MATLAB/R2012a/sys/os/glnx86/libstdc++.so (just rename it to e.g. libstdc++.so.bak).

Solution 2:

You need to create a symbolic link to the gcc 4.7 library so matlab knows to use it. Something like:

ln -s {/path/to/file-name} {link-name}

If you don't want to use symbolic links, then just define this path in a terminal from which you launch matlab:

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/path/to/libstdc++.so.6
./matlab

Solution 3:

It's a late answer, but I believe the cleanest, most Mathworks-approved and least invasive solution is to edit the .matlab7rc.sh script. This is a script used by the matlab script when you start MATLAB under UNIX-like systems. (See http://www.mathworks.ch/ch/help/matlab/ref/matlabunix.html)

Copy that script (found under {matlabroot}/bin) to the root of your project, or to your home directory. Then tell MATLAB to first search in the system directories for the C++ libraries, instead of its own directories. On my system I changed line 191:

191c191
<       LDPATH_PREFIX='/usr/lib/x86_64-linux-gnu'
---
>       LDPATH_PREFIX=''

(Simply setting LD_LIBRARY_PATH to the empty string is not a good solution, because that will prevent you from loading other third-party libraries.)

When this is done you might get the following message when running mex:

/usr/bin/ld: cannot find -lstdc++

This usually means that g++ is not installed. On a Debian-like system, run:

sudo apt-get install g++

From here on, you might still get an annoying warning about using a version of gcc beyond what is officially supported, but that is harmless and can be ignored.