[$] Old compilers and old bugs

The kernel project goes out of its way to facilitate building with oldertoolchains. Building a kernel on a new system can be enough of a challengeas it is; being forced to install a custom toolchain first would notimprove the situation. So the kerneldevelopers try to keep it possible to build the kernel with the toolchainsshipped by most distributors. There are costs to this policy though, includingan inability to use newer compiler features. But, as was seen in a recentepisode, building with old compilers can subject developers to old compilerbugs too.