[botan-devel] RTTI problems with Botan

Jack Lloyd lloyd at randombit.net
Tue Oct 16 12:06:00 EDT 2012

Hi Christian,

Wow, what version of OS X / XCode is this? I thought this lack of
type_info merging was only an issue back in the ancient (GCC 2.95 or
so) days, I had no idea this was an issue on any remotely modern
system. Can you file a ticket (bugs.randombit.net) with the full
details (all relevant versions, a testcase, etc)?


On Tue, Oct 16, 2012 at 05:42:21PM +0200, Christian Kandeler wrote:
> Hi,
> as a Botan user, I have been bitten recently by the problem described here:
>      http://marcmutz.wordpress.com/2010/08/04/fun-with-exceptions/
> The class declaration pattern shown in the link matches how Botan 
> defines pretty much all of its exceptions and quite a number of other 
> classes as well. As a result,
>      a) my client code cannot catch exceptions thrown out of Botan and
>      b) dynamic_casts in Botan fail for objects allocated in client code.
> The results are disastrous, as one can imagine.
> While I realize that this problem is probably due to rather poor 
> compiler/linker behavior, it is the current state e.g. on MacOs, where I 
> am observing the failures mentioned above. I therefore suggest adding 
> non-inline destructors to all exported polymorphic classes to be on the 
> safe side.
> Regards,
> Christian
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