Re: gtkmm with VS2005 vd2 option

[stotz gmx ch (Urs Stotz)]

On Fri, Oct 03, 2008 at 10:45:28PM +0200, Armin Burgmeier wrote:
> On Fri, 2008-10-03 at 18:21 +0200, Stotz Urs (ENT) wrote:
> > On Wed, Oct 01, 2008 at 03:56:35PM +0200, Stefani Leonardo wrote:
> > > 
> > > I am trying to compile an gtkmm 2.12 program with /vd2 option 
> > > [...]
> > > /vd2 is mandatory on gtkmm programs?
> > 
> > MSDN say: /vd supports incorrect behavior in an early version of Visual
> > C++, and is no longer needed.
> > 
> > 
> > - Microsoft Visual Studio 2008/.NET Framework 3.5
> > http://msdn.microsoft.com/en-us/library/7sf3txa8.aspx
> > /vd supports incorrect behavior in an early version of Visual C++, and
> > is no longer needed.
> 
> This very page says for /vd2:
> 
> "Allows you to use dynamic_cast Operator on an object being constructed.
> For example, a dynamic_cast from a virtual base class to a derived
> class."
> 
> which is exactly what gtkmm does, IIRC (although I'm not sure where, and
> it seems not to be mentioned in the bug). This is why /vd2 is required
> for applications using gtkmm.
> 
[...]
> > I think you don't need /vd2 for Visual Studio 2005 and higher any more.
> 
> I don't think so. But feel free to try out.

I try with Cedric Gustins test example:
http://connect.microsoft.com/VisualStudio/feedback/ViewFeedback.aspx?FeedbackID=101134

builded with: cl /vd2 /Zi /MDd /EHsc vd2_or_not.cxx
test ok:

1. Testing a Base object
Inside constructor:
 this = 0012FF38, dynamic_casted this = 0012FF38
Outside constructor:
 this = 0012FF38, dynamic_casted this = 0012FF38
2. Testing a Derived object
Inside constructor:
 this = 0012FF48, dynamic_casted this = 0012FF48
Outside constructor:
 this = 0012FF48, dynamic_casted this = 0012FF48

builded with: cl      /Zi /MDd /EHsc vd2_or_not.cxx
test failed:

1. Testing a Base object
Inside constructor:
 this = 0012FF40, dynamic_casted this = 0012FF40
Outside constructor:
 this = 0012FF40, dynamic_casted this = 0012FF40
2. Testing a Derived object
Inside constructor:
 this = 0012FF4C, dynamic_casted this = 0012FF50
 dynamic_cast<> seems to have failed.
Outside constructor:
 this = 0012FF4C, dynamic_casted this = 0012FF4C

you are right.

Regards,
Urs