From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.3) Gecko/20030314 Description of problem: An application we have link different parts in different ways, archive library, shared library, and at run time with dlopen(). In some cases we have found dynamic_cast fails. I believe the attached test case best illustrates this. It is essentially the same function, consisting of a main function which creates a class object and sends this to a test function. The class implementation can be linked as a shared or archive library; the test function can be linked as a shared library or at run time. The dynamic cast fails in the combination classes in archive library and run time dlopen, but nowhere else. Version-Release number of selected component (if applicable): gcc-3.2.3-20 How reproducible: Always Steps to Reproduce: 1.Unpack enclosed test case with "tar xfz testCast.tar.gz" 2.cd testCast 3.make Actual Results: ar_dlopen case fails. All other succeeds. Additional info: FWIW, this also happens on Fedora Core 1 with gcc-3.3.2-1.
Created attachment 96057 [details] Test case referred to in the initial report
If you want the ar_dlopen testcase to work, you need to link it with -WL,--export-dynamic.