If nothing else, I'd like to call out -Werror as a footgun when shipping for other people to use. By all means use it for dev work when you control the environment, but as an end-user (well, downstream, at least) it's a problem when packages outright break because I'm building with a newer compiler version that added more warnings.
absolutely. you don't want to have -Werror in a fast moving FOSS project. It depends on what you're doing. I compile against latest compiler versions in a CI pipeline that I want to fail. It's probably not how you want to ship in FOSS projects.
