[xsd-users] exporting symbols from a windows dll

[Boris Kolpackov]

Hi Angelo,

Angelo Difino <angelo at smartrm.com> writes:

> If i export the symbols I can create the c++ class, but when i try to  
> compile i found a lot of this kind of error:

Ok, I think I know what's going on. If you look into SegmentType.hxx
you will see that the CreationInformationType type is forward-declared
in this header but not defined. The definition is included later in
SegmentType.cxx. The file-per-type mode relies on such forward
declarations to untangle mutual dependencies between types.

Now, when you declare a class as DLL-exported, VC++ will have to
instantiate every implicit, non-inline function so that they actually
reside in the DLL. In this case it tries to instantiate implicit
operator=. The problem arises because the body of this copy-assignment
operator requires the definition of CreationInformationType. One thing
that you can try is to compile your DLL in the Release mode and see
if this error disappears (it may disappear because operator= will be
inlined).

The proper fix for this problem would be to generate our own 
implementation of operator= in the .cxx file where the definition of
CreationInformationType is known. If you would like, I can send you
a pre-release binary to try when this fix is ready.

Boris