If there's no service charge added explicitly then that amount is usually directly factored in the cost of the food and redistributed to the service staff. As far as I know there are currently no EU countries where tipping contributes towards salary.
However, contrary to what many might say, tipping has been a part of European culture for a very long time (especially in the UK, Germany and some Slavic countries). You won't offend basically anyone if you don't tip, since it's basically considered an extra thanks for the service, but small tips/round-ups are fairly common[0] and sadly somewhat important in countries with lower minimum wages or heavily seasonal tourism.
*That said*, while I have nothing against tips as a purely voluntary contribution, I'm of the idea that - regardless of traditions and customs - the push to de-normalize compulsory tips is of fundamental importance for establishing (and keeping) decent wages for staff.
[0]: from a few euros, up to 10%. The new 15/20/25% model is purely American and predatory in nature
