Can't use gcc in a clang built world

[Andrew Turner]

On Thu, 27 Jun 2013 13:06:07 +0200
Dimitry Andric <dimitry at andric.com> wrote:

> 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.

The reason to disable __clear_cache is incorrect in r244382 as it is a
builtin in clang, but calls into an external copy of __clear_cache. The
reason __clear_cache was disabled was because of a bug in clang where
it is unable to compile a builtin function, however I only found this
out recently.

The issue with clang has been fixed, and, as of r251791 __clear_cache
is enabled in compiler-rt.

Andrew
> 
> -Dimitry
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