[Gdal-dev] need RTTI for OGR (Windows)

[Chapman, Martin]

Ellen,

Also,

The reason it ran under Linux is because GCC enables it by default.  The
reason Microsoft does not is because it creates bigger binaries, because
it includes the V-Table type info information and it's a slight
performance hit.  You can also use the older typeid() function to
perform rtti.

Martin

-----Original Message-----
From: gdal-dev-bounces at lists.maptools.org
[mailto:gdal-dev-bounces at lists.maptools.org] On Behalf Of EllenD
Sent: Friday, April 07, 2006 6:31 AM
To: gdal-dev at lists.maptools.org
Subject: [Gdal-dev] need RTTI for OGR (Windows)


Hi,

I want to perform a dynamic_cast on an OGRGeometry* object as follows:

OGRGeometry *poGeometry ....  // not null
...
switch (poGeometry->getGeometryType())
{
    .....
     case wkbPolygon:
         MyFunc( dynamic_cast<OGRPolygon *>(poGeometry));
         ....
}

MyFunc(OGRPolygon  *poPolygon)
{
.....
}


Running this code under Linux works fine, but under Visual Studio I get
the
runtime following error:

Unhandled exception @ .... : Microsoft C++ exception: __non_rtti_object
@
....

I am using GDAL 1.3.1 and tried to compile it with the /GR option added
to
the OPTFLAGS compiler flags in nmake.opt. The compilation and
installation
are successfull, but I still get the error. 

How can I compile GDAL so that OGR (and GDAL) has RTTI support or is
something else wrong?

Ellen



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