Trying to use clang/head and XCC

[Sean Bruno]

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Following the External Tool Chain instructions on the wiki seem to not
work:
https://wiki.freebsd.org/ExternalToolchain

I've gotten about this far:
https://people.freebsd.org/~sbruno/clang_head_build_log.txt

Two items of note.
 -- The bootstrap bits *completely* ignore XCC and build with the host
cc/c++
 -- No documentation of what CFLAGS are required to build and ignore
warnings.

Anyone out there have success doing this?

sean
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