Re: MEX error message

Randy Poe wrote:
Michael Wild wrote:
Randy Poe wrote:
I'm trying to do some MEX programming. I haven't done this in a long
time and can no longer remember what sort of configuration steps I
have to go through, if any.

I compiled fine, no error messages.

When I try to invoke my code, I get this:

??? Invalid MEX-file '/proj/algorithms/merawan/matlab/(my
filename).mexglx':
/opt/matlab/R14/Linux/bin/glnx86/../../sys/os/glnx86/libgcc_s.so.1:
version `GCC_3.3' not found (required by /usr/lib/libstdc++.so.6).

We're running Redhat Linux here, and 'gcc -v' tells me it is
version 3.4.4

GNU C version 3.4.4 20050721 (Red Hat 3.4.4-2) (i386-redhat-linux)
compiled by GNU C version 3.4.4 20050721 (Red Hat 3.4.4-2).

- Randy

matlab comes with its own c-libraries (version 3.3) and your compiler
compiles the stuff with 3.4 which causes some incompatibilities. either
install a 3.3 compiler, or follow the steps in

http://www.mathworks.com/support/solutions/data/1-QBCS1.html?solution=1-QBCS1


and move the old libraries out of the way, so matlab uses the new,
system wide ones.

Thanks for the rapid response.

Are those runtime libraries just relevant to MEX, or are they used
during ordinary Matlab sessions? I've passed this info on to
the sysadmins, but I'm not sure whether this is really the right
solution for a shared installation or whether it is going to cause
problems for other users.

- Randy



moving the libs out of scope caused me some problems with some exotic matlab functions, which were compiled against the old libraries. either recompile them (you have the sources), or live with it.

another solution which comes to my mind: the matlab start script (in linux the "matlab" command is actually a script) sets up the LD_LIBRARY_PATH. what you could do: create another directory, make in there symlinks to all the non-critical libraries, and leave out the critical ones. then make a local copy of the matlab script to e.g. ~/bin, add that directory to your PATH variable (perhaps it's already set up to be in it...) and then edit your own version of the script to reflect the change you made in the LD_LIBRARY_PATH.

hope this works (never tried it) :-)

michael
.

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