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c++/6787: seg fault when loading dynamic library that contains dynamic_cast

From: aznagar at web dot de
To: gcc-gnats at gcc dot gnu dot org
Date: 23 May 2002 19:17:23 -0000
Subject: c++/6787: seg fault when loading dynamic library that contains dynamic_cast
Reply-to: aznagar at web dot de

>Number:         6787
>Category:       c++
>Synopsis:       seg fault when loading dynamic library that contains dynamic_cast
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu May 23 12:26:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Dirk Walther
>Release:        3.1 and 2.96
>Organization:
>Environment:
RedHat linux 7.1 on a i686
>Description:
A dynamic library loader that has been compiled with g++-2.96 crashes with a segmentation fault when loading a dynamic library that has been compiled with g++-3.1 and that contains dynamic_cast.

The problem does not occur when the library loader is compiled using g++-3.1 - in this case it loads and executes libraries compiled with g++-2.96 or g++-3.1 just fine. Also, the problem does not occur when both library loader and library are compiled with g++-2.96.

I have attached the code for simple examples for the library loader, the library, and a log of a debug attempt.

In real life, the library loader is Matlab (compiled with g++-2.95.2) which I cannot recompile. The library is a MEX function that needs to use g++-3.x
>How-To-Repeat:
Use the code and the compiler flags as mentioned in the attached file.
>Fix:
The library loader should be recompiled using g++-3.x. Unfortunately, this is not possible for me with Matlab.
>Release-Note:
>Audit-Trail:
>Unformatted:
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