This is what the human resources department is for.

If a few people mention it, they will have to do something. And you don't have to risk getting yelled at.

I wish I had done that but getting HR involved seemed like the nuclear option to me, especially for something the person may not have known about. I had approached the team manager but he, in spite of frequent rants about the evils of political correctness, didn't wish to act since he thought it was due to what he called 'culture'. Unpleasant business all around.

I loved the technology and product at that workplace but such awkward situations ensured that I moved on as quickly as I got the opportunity to do so.

HR doesn't punish him, they talk to him about it and why its a problem.

I worked at a big corporation. It was against the rules to comment on body odor of a coworker because of an incident where the team got together to give someone perfume and soap and such and try to nicely tell her she smelled. Turned out she had a medical condition and it was not a hygiene issue and she was incredibly upset. HR sided with her.

Yep, exactly.

We had a guy at a previous job of mine (food service) who (almost certainly) didn't wear deodorant and it became an HR issue.

His roommate (who also worked with us) said he did shower.

Showered every day?

Unless the person in question had a medical condition... I find this very hard to believe. There are a lot of cultures where people don't use deodorant but wash every day (and more if doing sports etc... And it's not an issue).

Morning, evening or both?

Got one such colleague, and she farts all day too... I can live with it but some are getting mad :-)