Re: Accessing fortran libraries [SEC=UNCLASSIFIED]

Those routines are likely to be in a fortran runtime library.  You probably need to use the RTLD_GLOBAL flag when loading your fortran SO to have the symbols resolved.

 

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From: José Gómez-Dans [mailto:[email protected]] 
Sent: Friday, 26 November 2010 2:06 AM
To: ctypes-users
Subject: [ctypes-users] Accessing fortran libraries

 

Hi,

I would like to access a fortran DLL in linux (x86_64) using ctypes. I thought that this would be transparent, but if I try I get the following problems

mylib = ctypes.CDLL ("./libmylib_x86_64.so")

OSError                                   Traceback (most recent call last)

OSError: ./libmylib_x86_64.so: undefined symbol: _gfortran_internal_malloc64

Out of interest, I tried ld on the library, and I found that other gfortran-related functions are missing, as well as some from math.h (for example, log, cos, sin,  _gfortran_transfer_real, _gfortran_st_write, _gfortran_pow_r8_i4, _gfortran_internal_unpack, _gfortran_st_write_done, etc.). I link code to this library and it works, but I would like to access the library from python.

There's something I am obviously  missing, but I don't even know where to start looking! Any hints greatly appreciated.

Thanks!
Jose

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