I like the intermediate position: enable -Werror for development builds (which for QEMU means "builds from head-of-git"), leave things as just warnings for (sou

I like the intermediate position: enable -Werror for development builds (which for QEMU means "builds from head-of-git"), leave things as just warnings for (source) releases, and give the user an escape hatch (eg a configure --disable-werror option) in case they need it. Enforcing warning-free compiles for the average developer is really useful for maintaining a minimum quality bar, so it's good to find a way to keep that without annoying people who might be compiling from source but are essentially 'end-users' of it.