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From: Dimitry Andric <dimitry@andric.com>
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To: Kevin Day <toasty@dragondata.com>, 
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Subject: Re: Can't use gcc in a clang built world
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Cc: Andrew Turner <andrew@fubar.geek.nz>
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On 2013-06-27 02:02, Kevin Day wrote:
> Are you supposed to be able to use gcc to build userland binaries if you built world with clang?
>
> I'm on -CURRENT as of a few days ago (using armv6 but i'm not sure if that matters).

Yes, the arch matters a lot.  For arm, adding __clear_cache() to libgcc
was explicitly disabled by Andrew here:

http://svnweb.freebsd.org/base?view=revision&revision=244382

"Don't provide clear_cache or the __sync_* functions on ARM with clang
as they are provided by clang as builtin functions."

Maybe those functions should be in libgcc after all, if other programs
depend on this.

-Dimitry