OpenMP and shared libraries

"Bob Deblier" <bob.deblier@xxxxxxxxxx> · Wed, 17 Jun 2009 12:43:44 +0000

Dear,

I'm experimenting with OpenMP support in the BeeCrypt crypto library, and have encountered a problem.

When I build a shared library with OpenMP support, and this library is loaded from Python, I get the following error (undefined symbols from the GOMP library):

bob@orion ~/beecrypt/python $ make check
Making check in test
make[1]: Entering directory `/home/bob/beecrypt/python/test'
PYTHONPATH="..:../.libs/" python test_all.py verbose
Traceback (most recent call last):
  File "test_all.py", line 58, in <module>
    print_versions()
  File "test_all.py", line 19, in print_versions
    from _bc import mpw
ImportError: /home/bob/beecrypt/.libs/libbeecrypt.so.7: undefined symbol: GOMP_parallel_sections_start
make[1]: *** [check] Error 1
make[1]: Leaving directory `/home/bob/beecrypt/python/test'
make: *** [check-recursive] Error 1

I guess this means that it's not possible to use a shared library with OpenMP support in an application (i.e. python) that wasn't linked with -fopenmp?

I'm using gcc 4.3.3, by the way.

Sincerely,

Bob Deblier