First, thanks for the amazing tool (I just discovered it, and it already solved many of my problems with cross-compilation). I'd really love to build clang as well as gcc. I'm an LLVM developer so I'm kinda familiar with clang and its build system but I'm not with crosstool-ng.
Hence, a couple of questions:

1. If I decide to work on it, would there be room to accept support for building clang in crosstool-ng?
2. Any guidance on where to start?

Thanks!

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Davide