compile fortran subroutine using matlab via mex

Hi, guys,

I am now trying to compile a fortran subroutine using matlab by building MEX-file first. My matlab version is a little old (2007b). I come across the following error, when I was using command mex in the command window:

Quote:

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>> mex yprimef.F yprimefg.F
Warning: You are using gcc version "4.2.4". The earliest gcc version supported
with mex is "4.0.0". The latest version tested for use with mex is "4.2.0".
To download a different version of gcc, visit http://gcc.gnu.org
eval: 1: g95: not found

mex: compile of 'yprimef.F' failed.

??? Error using ==> mex at 208
Unable to complete successfully.

---

Is there anyone encountered same issue?

I checked online and found that even the newest version matlab can only support up to gcc version '4.2.3'. This basically means that it won't work if I choose to install the new version matlab. Hence, I guess, the way to sort it out might be choose an older version gcc, say 4.1.0 for example. Does anyone know how to do that?

Any comments are appreciated. Thanks.

Anybody who knows how to choose the compiler? For example, enforce the system to use gcc-4.1.0, instead of gcc-4.2.4. Thanks.

Just did this.

1) In my case, I chose to install gcc-4.1:

Code:

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sudo apt-get install gcc-4.1

---

Don't forget to also install gfortran.

2) Fire up MATLAB, do

Code:

---

mex -setup

---

and choose to use "mexopts.sh" ( in my case, it was option #3)

3) Open ~/.matlab/mexopts.sh (using emacs, vim, gedit... whatever - sometimes it is under ~/.matlab/R2007b/mexopts.sh - assuming R2007b is your matlab version) and look inside the file for the part corresponding to your architecture; in my case, I'm using Ubuntu 64bit and so I modified this part:

Code:

---

#----------------------------------------------------------------------------
            ;;
        glnxa64)
#----------------------------------------------------------------------------
            RPATH="-Wl,-rpath-link,$TMW_ROOT/bin/$Arch"
            CC='gcc'
            CFLAGS='-ansi -D_GNU_SOURCE -fexceptions'
            CFLAGS="$CFLAGS -fPIC -fno-omit-frame-pointer -pthread"
            CLIBS="$RPATH $MLIBS -lm -lstdc++"
            COPTIMFLAGS='-O -DNDEBUG'
            CDEBUGFLAGS='-g'
#
            CXX='g++'
            CXXFLAGS='-ansi -D_GNU_SOURCE'
            CXXFLAGS="$CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread"
            CXXLIBS="$RPATH $MLIBS -lm"
            CXXOPTIMFLAGS='-O -DNDEBUG'
            CXXDEBUGFLAGS='-g'
#
#
            FC='g95'
            FFLAGS='-fexceptions'
            FFLAGS="$FFLAGS -fPIC -fno-omit-frame-pointer"
            FLIBS="$RPATH $MLIBS -lm"
            FOPTIMFLAGS='-O'
            FDEBUGFLAGS='-g'
#
            LD="$COMPILER"
            LDEXTENSION='.mexa64'
            LDFLAGS="-pthread -shared -Wl,--version-script,$TMW_ROOT/extern/lib/$Arch/$MAPFILE -Wl,--no-undefined"
            LDOPTIMFLAGS='-O'
            LDDEBUGFLAGS='-g'
#
            POSTLINK_CMDS=':'

---

to read

Code:

---

#----------------------------------------------------------------------------
            ;;
        glnxa64)
#----------------------------------------------------------------------------
            RPATH="-Wl,-rpath-link,$TMW_ROOT/bin/$Arch"
            CC='gcc-4.1'
            CFLAGS='-ansi -D_GNU_SOURCE -fexceptions'
            CFLAGS="$CFLAGS -fPIC -fno-omit-frame-pointer -pthread"
            CLIBS="$RPATH $MLIBS -lm -lstdc++"
            COPTIMFLAGS='-O -DNDEBUG'
            CDEBUGFLAGS='-g'
#
          CXX='g++-4.1'
            CXXFLAGS='-ansi -D_GNU_SOURCE'
            CXXFLAGS="$CXXFLAGS -fPIC -fno-omit-frame-pointer -pthread"
            CXXLIBS="$RPATH $MLIBS -lm"
            CXXOPTIMFLAGS='-O -DNDEBUG'
            CXXDEBUGFLAGS='-g'
#
#
            FC='gfortran'
            FFLAGS='-fexceptions'
            FFLAGS="$FFLAGS -fPIC -fno-omit-frame-pointer"
            FLIBS="$RPATH $MLIBS -lm"
            FOPTIMFLAGS='-O'
            FDEBUGFLAGS='-g'
#
            LD="$COMPILER"
            LDEXTENSION='.mexa64'
            LDFLAGS="-pthread -shared -Wl,--version-script,$TMW_ROOT/extern/lib/$Arch/$MAPFILE -Wl,--no-undefined"
            LDOPTIMFLAGS='-O'
            LDDEBUGFLAGS='-g'
#
            POSTLINK_CMDS=':'

---

4) Restart matlab.

You should be able to compile your mex now.

Good luck! :D

Thanks melissawm.

It's strange that TMW advises that MATLAB R2009a is compatible with this release of Ubuntu ("Ubuntu 8 and above" http://www.mathworks.com/support/sys...ase/linux.html) while the default GCC version is 4.3. I'm just glad that the Ubuntu/Debian packagers are still supporting some older versions of GCC.

The error was just related to fortran compiler. Concerning the Gcc it was just a warning, so you can try to compile it without any change on gcc and just changing your default compiler in the mex-options.
It works for me.
Cheers,
Antonio

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