Re: [wxCode-users] Can't compile my own component in Linux. Works fine with VS C++ 2005

[John L. <jla...@gm...>]

On 2/8/07, Mat=EDas Szeftel <msz...@ya...> wrote:
>
> Hi wxCoders!
> I hope you can help me. This might be a more c++ related question but I f=
eel
> that you are the only ones that can help me. HELP!!! :(
>
> I'm tryng to comile my component (wxActiveRecordGenerator: activerecord m=
odule
> in wxCode CVS).
>
> I'm in Kubuntu using wx2.8 and gcc 4.1 and DatabaseLayer 1.6. I'm having
> linking errors when doing a "make -f GNUmakefile".
>
> Hope you can help...
>
> Regards Mat=EDas.
>
> This is the output:
>
> btw: referencia a `vtable for xxxx' sin definir =3D undefined reference t=
o
> `vtable for xxxx'
> All the methods are defined  so I really don'tget the error messages...an=
d I
> have no virtual functions. I should be getting linker errors against
> DatabaseLayer because I haven't compiled it yet.
>
> gnu/wxActiveRecordGenerator_DatabaseConnectionDlg.o: In function
> `DatabaseConnectionDlg::DatabaseConnectionDlg(wxWindow*, int, wxString
> const&, wxPoint const&, wxSize const&, long)':
> DatabaseConnectionDlg.cpp:(.text+0x27af): referencia a `vtable for
> DatabaseConnectionDlg' sin definir


> gnu/wxActiveRecordGenerator_RelationPropertiesDlg.o: In function
> `RelationPropertiesDlg::RelationPropertiesDlg(wxWindow*, int, wxString
> const&, wxPoint const&, wxSize const&, long)':
> RelationPropertiesDlg.cpp:(.text+0x2223): referencia a `vtable for
> RelationPropertiesDlg' sin definir

For starters you may want to try adding virtual destructors for these
classes, just an empty one like this. I think I've seen error messages
like these before and I'm guessing that they are from the base class
having a vtable, but your subclassed class doesn't explicitly have
one.

in DatabaseConnectionDlg.h add
virtual ~DatabaseConnectionDlg() {}

Hope this helps,
    John Labenski