Fortran shared library for Python with use of OpenMP

Hello,

I have a problem while making a shared library in Fortran to be loaded from Python. I've put together a minimal example to show the problem.

The subroutine:

    subroutine sgesvf() bind(C, name="sgesvf")
    
    implicit none
    
    real*4 a(4,4), b(4), c(4,4)
    integer pivs(4), inf, n, i, j
    
    ! Externals from the LAPACK library
    external sgesv
    
    !     Initialize the matrix a and the vector b
    data a/ 1, 2, 3, 4, &
       6, 7, 9, 9, &
       11,12,19,14, &
       16,17,18,12/
    data b/ 1, 3, 5, 6/
    
    n=4
    !$OMP PARALLEL DO DEFAULT(NONE) &
    !$OMP SHARED(A,C,N) &
    !$OMP PRIVATE(I,J) &
    !$OMP SCHEDULE(DYNAMIC,1)
    do i = 2, n
      do j = 1, i
         c(j,i) = ( a(j,i) + a(j,i-1) ) / 2.0
      end do
    end do
    
    !     Compute the solution
    call sgesv(4, 1, a, 4, pivs, b, 4, inf)
    
    !     Figure out if sgesv found a solution or not
    if (inf .eq. 0) then
       write (*,*) 'successful solution'
    else if (inf .lt. 0) then
       write (*,*) 'illegal value at: %d', -inf
       stop
    else if (inf .gt. 0) then
       write (*,*) 'matrix was singular'
       stop
    else
       write (*,*) 'unknown result (can''t happen!)'
       stop
    end if
    
    write(*,*) 'pivs=', pivs
    
    end subroutine sgesvf

which tests the most important tools I use in my real code, that is OpenMP and Lapack/Blas.

If I compile ignoring the OpenMP directives, that is:

    ifort -O2 -warn all -fPIC -I/opt/intel/mkl/include -module Release/ -c main.f90 -o Release/main.o
    ifort -shared  Release/main.o -o Release/libshared_lib_for_python_example.so -L/opt/intel/lib/intel64 -lmkl_rt -lpthread -lm

and use as:

    from ctypes import cdll
    lib = cdll.LoadLibrary('libshared_lib_for_python_example.so')
    print lib.sgesvf()

I get:

    successful solution
    pivs=           4           4           3           4           0

If I include the OpenMP:

    ifort -O2 -warn all -fPIC -openmp -I/opt/intel/mkl/include -module Release/ -c main.f90 -o Release/main.o
    ifort -shared  Release/main.o -o Release/libshared_lib_for_python_example.so -L/opt/intel/lib/intel64 -openmp -lmkl_rt -lpthread -lm

I get:

    Traceback (most recent call last):
      File "test.py", line 16, in <module>
        lib = cdll.LoadLibrary('libshared_lib_for_python_example.so')
      File "/usr/lib/python2.7/ctypes/__init__.py", line 443, in LoadLibrary
        return self._dlltype(name)
      File "/usr/lib/python2.7/ctypes/__init__.py", line 365, in __init__
        self._handle = _dlopen(self._name, mode)
    OSError: /opt/intel/composer_xe_2013_sp1.2.144/ipp/../compiler/lib/intel64/libifcoremt.so.5: undefined symbol: _intel_fast_memmove

I've tried several variations I found on forums (like adding -lifport -lifcoremt -lifcore -lsvml -lirc to the linking, make sure I'm linking with the right libraries, etc.). I've also tried posting on Intel forum since 2 weeks without any result.

I work under Debian Linux 7.0. My Intel compiler is: Version 14.0.2.144 Build 20140120.

Thanks in advance