Set domain for piwik's third party cookie

Hi,

I am using piwik and choose to track users using third party cookie set by piwik. The domain that sets cookie is dev.track.sitename.com, I want to get that cookie from other domain say dev.aaa.sitename.com, for which I want to set the third party cookie with domain sitename.com. Is there any configuration available for setting the domain of third party cookie?

Is there any configuration available for setting the domain of third party cookie?

you can configure the path here: https://github.com/piwik/piwik/blob/6296_alternative_fix/config/global.ini.php#L508-512

But the domain is set automatically to the piwik server hostname

Thanks alot!!