Mex 64bit library error

Hi,

I am trying to compile another mex program. I believe the problem lies in the library list but I don't know what is missing as the requested library is there.

Here is the error I get:

/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/4.3.5/libgfortran.a: relocation R_X86_64_32 against, '.rodata.str1.1' can not be used when making a shared object; recompile with -fPIC /usr/lib/gcc/x86_64-linux-gnu/4.3.5/libgfortran.a: could not be reads symbols: Bad value

Any help is much appreciated.

Adrianna

Answer 1

[Kaustubha Govind]

Please see my answer to Invalid MEX file...cannot dynamically load executable OR -shared option in MEX causes "bad values" in compiling and linking.

[Adrianna]

Are you suggesting reinstalling gcc with a modified make file? This seems odd that there would not be a simpler way to deal with standard installations of fundamental software such as gcc.

[Kaustubha Govind]

No, I'm not suggesting that. I think what's happening is that you're trying to load a library in your MEX-file that has not been compiled with the -fPIC option.

Where is the symbol .rodata.str1 coming from? Is that in your FORTRAN code? How did you link it to your MEX-function?

Answer 2

[Michael]

Matlab is using libgfortran.a but it should instead be using libgfortran.so.3

I've been able to get around this by explicitly including libgfortran.so.3 in the mex call, i.e.

mex myProgram.F90 /usr/local/MATLAB/R2011a/sys/os/glnxa64/libgfortran.so.3 -output myProgram

note you'll need to modify this based on the location of your gfortran library