[Ipopt] Problem running Ipopt matlab interface

Fri Jul 6 18:00:26 EDT 2012

Paul,

It looks like the Mathworks recommended compiler for R2011b is GCC/gfortran 
4.3, see http://www.mathworks.com/support/compilers/R2011b/glnxa64.html. 
Successful compilation of the mex file and a working Matlab interface are a 
bit different, unfortunately.

I've noticed this issue with Matlab, it loads its own set of .so libraries 
which are not always compatible with what you compiled Ipopt against. 
Particularly since you used F77=/usr/bin/gfortran-4.6 to compile Ipopt (and 
the ThirdParty sources like Lapack). Before you go to the trouble of 
switching to GCC/gfortran 4.3 though, will you be needing a shared Ipopt 
library file, or do you just want to use the Matlab interface? If the 
latter, I recommend you compile Ipopt with static libraries by 
adding --disable-shared to the configure command.

Since you are using the coinlapack and coinblas reference implementations, 
static libraries should also work around the namespace collisions 
(http://list.coin-or.org/pipermail/ipopt/2011-March/002376.html) and 
incompatible 32/64 bit integer API problem that will affect every linear 
solver that uses BLAS (all but MA27). If you need to use a shared-library 
BLAS, it is possible to force Matlab to use your BLAS library instead of its 
own by using the BLAS_VERSION environment variable, as formerly documented 
here:
http://web.archive.org/web/20090615072921/http://www.mathworks.com/support/solutions/en/data/1-18QUC/

Matlab also has its own MA57 library with an incompatible API to the version 
Ipopt uses, but the problem can be avoided by compiling libcoinhsl as a 
static library. If you require libcoinhsl to be a shared library you can 
force Matlab to load libcoinhsl.so before loading its own libmwma57.so by 
using the LD_PRELOAD environment variable, but then the Matlab command ldl 
will not function properly on sparse matrices.

-Tony

-----Original Message----- 
Date: Fri, 6 Jul 2012 13:19:13 +0200
From: Paul van Hoven <paul.van.hoven at googlemail.com>
To: ipopt mailing list <ipopt at list.coin-or.org>
Subject: [Ipopt] Problem running Ipopt matlab interface
Message-ID:
<CANqzD4P00-EO9_aQ=8v9-QjGJDzU2cW+VooNc9ikoKTvEa8vLg at mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1

Hi, I just successfully compiled and installed ipopt on a linux
machine. Now I'd like to use the matlab interface. Actually everything
works fine, the interface compiles fine without any errors or
warnings, the compiler version GCC 4.2 works also fine with matlab so
there is no warning as well, and the interface is correctly installed.
But when I try to run a simple matlab demo app I get the following
error:

>> IpoptDemo.clusterRunme
------------------------------------------
Invalid MEX-file 
'/homes/numerik/paul/lib/Ipopt/MatlabInterface/ipopt.mexa64':
/net/matlab/Matlab2011b/bin/glnxa64/../../sys/os/glnxa64/libgfortran.so.3:
version `GFORTRAN_1.4' not
found (required by
/homes/numerik/paul/lib/Ipopt/lib64/coin/ThirdParty/libcoinlapack.so.1)

Error in IpoptDemo.runme (line 45)
            [x info] = ipopt(x0,funcs,options);

Error in IpoptDemo.clusterRunme (line 9)
            IpoptDemo.runme;

I'm not shure if it helps but these are the first lines of the
makefile for the matlab interface:

MATLAB_HOME =/net/matlab/Matlab2011b
MEXSUFFIX   =mexa64
PATH_TO_IPOPT_COMPILATION= /homes/numerik/paul/lib/Ipopt
SRCDIR = 
/homes/numerik/paul/lib_src/CoinIpopt/Ipopt/contrib/MatlabInterface/src

###############################################################################################
DESTINATION_DIR = $(PATH_TO_IPOPT_COMPILATION)/MatlabInterface
MEX = $(MATLAB_HOME)/bin/mex
#Pay attention to add a by your matlab version supported g++
CXX         = /usr/site-local/bin/g++-4.2
CXXFLAGS    = -fPIC -DMX_COMPAT_32 -DMATLAB_MEX_FILE -DMWINDEXISINT

INCLUDES        = -I$(PATH_TO_IPOPT_COMPILATION)/include/coin
-I$(MATLAB_HOME)/extern/include

MEXFLAGS    = -cxx CC='$(CXX)' CXX='$(CXX)' LD='$(CXX)' -lm
-L$(PATH_TO_IPOPT_COMPILATION)/lib64/coin -lipopt \

-L$(PATH_TO_IPOPT_COMPILATION)/lib64/coin/ThirdParty -lcoinlapack
-lcoinblas -lcoinhsl -lamplsolver \

-L/usr/site-local/lib/gcc/x86_64-unknown-linux-gnu/4.2.4 -lgfortran
-ldl -largeArrayDims
#Dynamic linking
#MEXFLAGS    = -cxx CC='$(CXX)' CXX='$(CXX)' LD='$(CXX)' -lm
-L$(PATH_TO_IPOPT_COMPILATION)/lib64/coin -lipopt -largeArrayDims

And this was the configure call for configuring ipopt:
../configure --prefix=/homes/numerik/paul/lib/Ipopt \
CXX=/usr/site-local/bin/g++-4.2 \
CC=/usr/site-local/bin/gcc-4.2 \
F77=/usr/bin/gfortran-4.6 \
ADD_CXXFLAGS="-fPIC -fexceptions -DFUNNY_LAPACK_FINT" \
ADD_CFLAGS="-fPIC -fexceptions" \
ADD_FFLAGS="-fPIC -fexceptions" \
--with-matlab-home=/net/matlab/Matlab2011b

This is what I did so far:
1. I checked that a file called "libgfortran.so.3" is in the directory
"/net/matlab/Matlab2011b/bin/glnxa64/../../sys/os/glnxa64"
2. I added the path to the LD_LIBRARY_PATH which had no effect
3. I added an environment path in matlab itself by
addpath('/net/matlab/Matlab2011b/bin/glnxa64/../../sys/os/glnxa64')
which also had no effect.
4. A simple ipopt demo app written in c++ works fine. So I checked
that the installed ipopt version works.

Any suggestions how I could repair this problem?

------------------------------

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End of Ipopt Digest, Vol 91, Issue 4
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