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From: Johannes Schmidt <johannes.f.schmidt@gmx.de>
To: gcc-help@gcc.gnu.org
Subject: gcc-3.0.3 + glut
Date: Mon, 14 Jan 2002 12:58:00 -0000
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Hi,

if I link my application with glut (-lglut), my program seg faults (or sig 
ills, it depends upon the optimization level) whenever I try to
dynamic_cast an object.

This does not happen with gcc-2.95.3.


minimal example:

#include <iostream>

class Base {
public:
    virtual ~Base() {};
};

class A : public Base {
};

int main(int argc, char ** argv) {
    A * a = new A();
    Base * base = a;
    std::cerr << "implicit cast    Base * base = a; \n";

    A * a2 = dynamic_cast<A*>(base);
    std::cerr << "explicit cast    A * a2 = dynamic_cast<A*>(base); \n";
}

compile instruction:
g++-3.0 test_cpp.cpp -o test_cpp -lglut

system:
Debian GNU/Linux
gcc version 3.0.3


Thanks,
Johannes