[Boost-users] [signals, MSVC8.1] Hang in signals constructor when upgrading from 1.33.1 to 1.34.1

From: Kris Braun (kbraun_at_[hidden])
Date: 2007-12-14 16:35:37

Hi there,

Trying to upgrade from 1.33.1 to 1.34.1 on Visual Studio 2005, I'm
experiencing an infinite loop in the signals code. It happens when
named_slot_map constructor calls groups.clear(), which ends up in some
standard library iterator cleanup code (_Clean_up_iter_debug). It
appears there's a circular link in some pointers to parents.

This is happening on a debug build with both Boost and my project
compiled with _HAS_ITERATOR_DEBUGGING=0. The problem does not appear on
non-debug builds. 

The signals constructor is running inside the function below, which is
called during C++ static initialization:

static boost::signal< void( E& ) >& GetHandler( void )
{
    static boost::signal< void( E& ) > _Handler;
    return _Handler;
}

Does anybody have any idea what has changed between 1.33.1 and 1.34.1
that would cause this behaviour change?

Thanks,
Kris

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