atomic in i386 Current after CLANG 6 upgrade

[Dimitry Andric]

On 15 Jan 2018, at 11:43, Luca Pizzamiglio <pizzamig at freebsd.org> wrote:
> 
> I've already received a couple of messages from pkg-fallout about build
> failure on head-i386-default [1] [2] both pointing to the same errors,
> about missing intrinsic symbols related to __atomic_*
> 
> The clang documentation about C11 atomic builtins [3] stats that __atomic_*
> are GCC extension and Clang provides them.
> 
> It seems to me that this specific GCC-compatible builtin are enabled on
> amd64, but not on i386.
> Is there a way to enable GCC compatible __atomic_ builtin also on i386?
> Or should I provide patches to adopt _c11_atomic_* instead of __atomic_*
> for every ports that need it ?

There is some strangeness going on with an upstream bug fix [1], which
has the unintended side effect of sometimes emitting libcalls to
__atomic functions that we do not have on i386.  I've commented on the
upstream bug report, but I do not know an easy workaround at this
point.

-Dimitry

[1] https://bugs.llvm.org/show_bug.cgi?id=34347

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