Linker Error cutest binary with matlab - c++

Question

I need to implement a library with mathematical problems to test an algorithm I wrote in matlab. The library is called "cutest" (see here: http://ccpforge.cse.rl.ac.uk/gf/project/cutest/wiki/).
As I am using Ubuntu, it's not possible to install this thing via the homebrew repo. Therefore I was doing the manual installation and was able to install cutest and the problemdecoder "sifdec" (also downloadable ob the page above).
I am now stuck in the point, where I need to compile a binaryfile that can be used by matlab. I guess it has something to do with the compiler flags of fortran/gcc and a 32/64 bit thing (as I was already scrolling through other posts and google).
The Error I get is the following:
/usr/bin/ld: i386 architecture of input file `/home/beck/CUTEst/cutest
/objects/pc64.lnx.gfo/double/mcutest.o' is incompatible with i386:x86-64
output
/usr/bin/ld: /home/beck/CUTEst/cutest/objects/pc64.lnx.gfo/double
/mcutest.o: file class ELFCLASS32 incompatible with ELFCLASS64
/usr/bin/ld: final link failed: File in wrong format
collect2: error: ld returned 1 exit status
mex: link of ' "mcutest.mexa64"' failed.
The mex file is from matlab, I didn't modify it yet (nor the optionsfile for mex).
The settings for the makefile "pc64.lnx.gfo", which I created (automatically) via a terminal installation are the following:
# Architecture dependent makefile
# (automatically generated by install_cutest)
VERSION = pc64.lnx.gfo
# Basic system commands
CP = /bin/cp
MV = /bin/mv
RM = /bin/rm -f
SED = /bin/sed
GREP = /bin/grep
AR = /usr/bin/ar
RANLIB = /usr/bin/ranlib
# Directory for binaries
PRECIS = double
OBJ = $(CUTEST)/objects/$(VERSION)/$(PRECIS)
OBJS = $(CUTEST)/objects/$(VERSION)/single
OBJD = $(CUTEST)/objects/$(VERSION)/double
MOD = $(CUTEST)/modules/$(VERSION)/$(PRECIS)
SEDS = $(CUTEST)/seds/$(PRECIS).sed
MVMODS = $(MV) -f $(OBJ)/*.mod $(MOD)/ || true
# Compiler options
FORTRAN = gfortran-4.7
BASIC = -c -fno-second-underscore -fPIC
MODULES = -I$(MOD)
OPTIMIZATION = -O
NOOPTIMIZATION = -O0
DEBUG =
OPENMP = -fopenmp
F77 = -ffixed-form
F90 =
F95 =
NOFMAIN =
USUAL =
SPECIAL =
F77SUFFIX = f90
F95SUFFIX = f90
TIMER = GEN
NOT95 = IS95
NOT64 = IS64
AMPLDIR =
CC = gcc-4.7
CCBASIC = -c -ansi -pedantic -fPIC
CCONDEF =
CCDEBUG =
CCFFLAGS = -lgfortran
# Special flags
# Libraries
BLAS =
LAPACK =
CUTESTUSED =
# Shell used
BINSHELL = sh
# Set directories for optional packages
include $(CUTEST)/src/makedefs/packages
# Body of makefile
include $(PWD)/makemaster
I'd really appreciate any kind of help, this issue keeps me from going further with my master thesis.
EDIT: Added outputs of gcc-4.7/gfortran-4.7 -v
gcc-4.7 -v:
Using built-in specs.
COLLECT_GCC=gcc-4.7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.4-3ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --enable-objc-gc --with-cloog --enable-cloog-backend=ppl --disable-cloog-version-check --disable-ppl-version-check --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.4 (Ubuntu/Linaro 4.7.4-3ubuntu3)
gfortran-4.7 -v:
Using built-in specs.
COLLECT_GCC=gfortran-4.7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.4-3ubuntu3' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-gnu-unique-object --disable-libmudflap --enable-plugin --with-system-zlib --enable-objc-gc --with-cloog --enable-cloog-backend=ppl --disable-cloog-version-check --disable-ppl-version-check --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 4.7.4 (Ubuntu/Linaro 4.7.4-3ubuntu3)

Answer 1

I was able to solve the problem with the help of an academic member of my university. In case anyone has/will have the same problem here is what worked for me:
As the toolchain was 64-bit and the only file that was generated in 32-bit was the mcutest.o the error had to be in combination with the mex compilation (cause only this file was compiled with the mex compiler of matlab).
Inside the folderstructure was a file called makemaster which holds the settings alredy choosen in the installation progress for gfortran and gcc, but also settings for mex (which i wasn't asked to modify yet). However, after some testing, adding the line CFLAGS='$(CFLAGS)' in the MFLAGS resulted in a 64-bit output file and the error didn't occur anymore.
Thanks for your help anyway!