Problem with libeng.dylib and libmx.dylib for maci64

I am trying to call Matlab routines from a Fortran code using gfortran compiler on my Mac 10.7.3 Intel Core i7 laptop. I am getting following errors:

deb$ export DYLD_LIBRARY_PATH=/Users/deb/matlab/MATLAB_R2010a.app/bin/maci64

deb$ gfortran -I/Users/deb/matlab/MATLAB_R2010a.app/extern/include -L/Users/deb/matlab/MATLAB_R2010a.app/bin/maci64 -leng -lmx fengdemo.F 
ld: warning: in /Users/deb/matlab/MATLAB_R2010a.app/bin/maci64/libeng.dylib, file is not of required architecture
ld: warning: in /Users/deb/matlab/MATLAB_R2010a.app/bin/maci64/libmx.dylib, file is not of required architecture
Undefined symbols:
  "_mxdestroyarray_", referenced from:
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
  "_engopen_", referenced from:
      _MAIN__ in ccHWJjnZ.o
  "_engputvariable_", referenced from:
      _MAIN__ in ccHWJjnZ.o
  "_engclose_", referenced from:
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
  "_engevalstring_", referenced from:
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
  "_mxcopyptrtoreal8730_", referenced from:
      _MAIN__ in ccHWJjnZ.o
  "_enggetvariable_", referenced from:
      _MAIN__ in ccHWJjnZ.o
  "_mxgetpr_", referenced from:
      _MAIN__ in ccHWJjnZ.o
      _MAIN__ in ccHWJjnZ.o
  "_mxcreatedoublematrix730_", referenced from:
      _MAIN__ in ccHWJjnZ.o
  "_mxcopyreal8toptr730_", referenced from:
      _MAIN__ in ccHWJjnZ.o
ld: symbol(s) not found
collect2: ld returned 1 exit status

I am able to compile and run the same codes successfully on a 32-bit Linux machine.

It seems that in 64-bit machine, the matlab libeng.dylib and libmx.dylib files are not of required architecture, while in the 32-bit version they are fine.

Has anyone faced the same problem? Any fix-up will be appreciated.

Best,

Kalyanmoy Deb

Answer 1

[Kaustubha Govind]

I'm not a Mac user, but from my experience on Windows and Linux, it seems like the gfortran compiler may be attempting to compile a 32-bit binary, but you have the 64-bit verison of MATLAB installed (your libraries are located in a folder called maci64) and therefore have 64-bit libraries. You need to use gfortran to compile a 64-bit target to be able to link against these.