Trying to use clang/head and XCC

[Brooks Davis]

On Tue, May 19, 2015 at 09:23:42AM -0700, Sean Bruno wrote:
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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

You need to delete
/home/sbruno/bsd/clang/build/bin/../lib/clang/3.7.0/include/std* and
possibly also limits.h (it's broken for libstand on mips).  If you use
the ports/pkgs they do this.

> Two items of note.
>  -- The bootstrap bits *completely* ignore XCC and build with the host
> cc/c++

That's expected.  In principle clang could be used as the cross compiler
since it's multi-target, but gcc could never work unless the host and
target are the same.

>  -- No documentation of what CFLAGS are required to build and ignore
> warnings.

It will change with every clang/gcc release.  In practice you will need
to either fix the warnings wack-a-mole style or set NO_WERROR in the
environment.

-- Brooks

> 
> Anyone out there have success doing this?
> 
> sean
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