maria-developers team mailing list archive

[AugustQ <augustq@xxxxxxx>]

Hi Sergej,

thanks for your tip!

A first test shows that this work now.

I will do some more tests tomorrow. And in case of further problems I
will come back.

Thanks!!!
AugustQ


On Do, 2013-12-05 at 19:06 +0100, Sergei Golubchik wrote:
> Hi, AugustQ!
> 
> On Dec 05, AugustQ wrote:
> > 
> > just one question:
> > I have a simple plugin (a minimal storage engine) that does not load.
> > When I try to load it I get this error-message:
> > 
> > MariaDB [(none)]> install plugin dummy soname 'ha_dummy';
> > ERROR 1126 (HY000): Can't open shared library
> > '/home/august/MariaDB/pgm/lib/plugin/ha_dummy.so' (errno: 2 undefined
> > symbol: _ZN9ha_myisam5cloneEPKcP11st_mem_root)
> > 
> > Can you please give me a tip. Thanks.
> > 
> > Environment is MariaDB 10.0.4.
> > 
> > The same code works without any problems in MySQL (5.5.8 - just for a
> > test).
> 
> This happens because in MariaDB statically linked plugins don't export
> all their symbols. This helps to avoid name clashes with dynamically
> loaded plugins (like, when InnoDB is loaded and XtraDB is compiled in).
> Unlike MySQL we have a lot more of community developed storage engines,
> and we have to take these issues seriously.
> 
> Because of that, the symbol _ZN9ha_myisam5cloneEPKcP11st_mem_root is
> local in MariaDB, and your plugin doesn't see it. In MySQL this symbol
> is global.
> 
> I'll see if I can remove this.
> 
> Alternatively, you can try to link your plugin explicitly with
> libmyisam.a
> 
> Regards,
> Sergei
>