I'm interested in seeing the example - it was stripped from the mailing list. Cody
On Mar 10, 2011, at 7:02 AM, Roy Stogner wrote: > > On Thu, 10 Mar 2011, Tim Kroeger wrote: > >> I was now able to pinpoint the problem. (You know that I don't give up...) >> Consider the attached example problem and add the following compiler option: >> >> -fvisibility=hidden >> >> Then, it will crash in the way I described. (I am using g++ version 4.4.3.) >> >> Can anybody tell me why this happens? > > Hmm... the gcc man page warns about the interaction of > "visibility=hidden" and "C++ vague linkage entities" - the example it > uses is type_info of exceptions being thrown, but that same type_info > gets used for typeid() and dynamic_cast(), right? > > The catch then would be: why is the type_info for > TransientLinearImplicitSystem being generated only in your test.cpp > and not used from the library itself? That's a templated type, > typedef'ed to TransientSystem<LinearImplicitSystem>, sure, but we do > instantiate it explicitly in one of the library object files. Maybe > since the compiler doesn't know that ahead of time it creates its own > implicit instantiations, and then the visibility=hidden trickery > prevents the linker from recognizing that the libmesh.so object code > can and should be used instead? > > But I'm the wrong person to ask about this - my first real look at gcc > visibility options was when my new officemate started using them for > code optimization last year. I'll try asking him today. > --- > Roy > > ------------------------------------------------------------------------------ > Colocation vs. Managed Hosting > A question and answer guide to determining the best fit > for your organization - today and in the future. > http://p.sf.net/sfu/internap-sfd2d > _______________________________________________ > Libmesh-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/libmesh-users ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
