Matthew Dillon wrote up a short bit on SMP hardware support, and how it needs to improve. Aso, as part of virtual kernel support, he committed the potential future ability to compile kernels on non-native architectures, i.e. cross-compilation, which can be handy.
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Actually I think he means that one architecture can actually use the sources and headers of another architecture, for example the VKERNEL architecture can use the i396 headers and sources.
Cross compilation theoretically could work with our infrastructure, just the architectures are missing.