On Mon, 15 Jan 2018 11:43:44 +0100 Luca Pizzamiglio <pizza...@freebsd.org> 
> 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 ?
> [1]
> http://beefy11.nyi.freebsd.org/data/head-i386-default/p458948_s327953/logs/librdkafka-0.11.3.log
> [2]
> http://beefy11.nyi.freebsd.org/data/head-i386-default/p458948_s327953/logs/stress-ng-0.09.09.log
> [3] https://clang.llvm.org/docs/LanguageExtensions.html#langext-c11-atomic

8 byte atomics requires at least i586.  So either find a way to disable
the use of these atomics in these ports or add something like this to
the port Makefile.

.if ${ARCH} == i386 && ! ${MACHINE_CPU:Mi586}
CFLAGS+=        -march=i586
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