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Given that CPU usage is at 100% now for most jobs, such as bootstrapping GCC, there is not much room for any improvement through threading.
Geert, I find this a bit incomprehensible, the whole point of threading is to increase CPU availability by using multiple cores.
Even in the best case, large parts of the compilation will still be serial. In the non-optimizing case, which is so important for the compile-debug-edit cycle, almost no parallelism will be possible.
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