http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47260
--- Comment #6 from Craig Powers <craig.powers at gmail dot com> 2011-01-12 14:11:28 UTC --- I also was unable to get the procedure into a DLL with omission of DLLEXPORT, instead attempting to get it in using a .DEF file and either gfortran or dlltool. I'm not sure if that reflects another aspect of the same problem. If I do this: gfortran -shared -o test.dll test.def test.o typedata.o I get: Cannot export _compute_load_...@28: symbol not defined But if I look at the output of nm test.o, I see: 00000000 T _compute_load_...@28