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c++/10891: code using dynamic_cast causes segfaults when -fno-rtti is used
- From: Matthias Klose <doko at net dot local>
- To: gcc-gnats at gcc dot gnu dot org, debian-gcc at lists dot debian dot org
- Date: Tue, 20 May 2003 23:59:25 +0200
- Subject: c++/10891: code using dynamic_cast causes segfaults when -fno-rtti is used
- Reply-to: 188943 at bugs dot debian dot org
>Number: 10891
>Category: c++
>Synopsis: code using dynamic_cast causes segfaults when -fno-rtti is used
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Tue May 20 22:06:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator: Sean 'Shaleh' Perry <shalehperry@attbi.com>
>Release: 3.3 (Debian) (Debian testing/unstable)
>Organization:
The Debian Project
>Environment:
System: Debian GNU/Linux (unstable)
Architecture: i686
>Description:
[ Reported to the Debian BTS as report #188943.
Please CC 188943@bugs.debian.org on replies.
Log of report can be found at http://bugs.debian.org/188943 ]
3.2.3 / 3.3
Now obviously, dynamic_cast requires rtti so using -fno-rtti is silly.
I ran into this on a C++ project where we had been using -fno-rtti because rtti
was not used. A recent commit added dynamic_cast code and started segfaulting.
It was believed that the dynamic_cast was at fault and this caused some finger
pointing. Then the no-rtti was noticed.
The compiler should give a warning (or perhaps even an error) if code requiring
rtti is used while the -fno-rtti option is in effect.
#include <iostream>
class EventHandler {
public:
virtual ~EventHandler(void) {}
virtual void thisEvent(void) {}
virtual void thatEvent(void) {}
};
class MyMenu: public EventHandler {
public:
virtual void thisEvent(void) { std::cout << "this Menu handler\n"; }
virtual void thatEvent(void) { std::cout << "that Menu handler\n"; }
};
class OtherThing: public EventHandler {
public:
virtual void thisEvent(void) { std::cout << "this OtherThing handler\n"; }
virtual void thatEvent(void) { std::cout << "that OtherThing handler\n"; }
};
void do_event(EventHandler* handler) {
if (dynamic_cast<MyMenu*>(handler)) {
// also call thatHandler for menus
handler->thatEvent();
}
handler->thisEvent();
}
int main(int argc, char* argv[]) {
MyMenu menu;
OtherThing thing;
do_event(&menu);
do_event(&thing);
exit(0);
}
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: