[Patch libstdc++] Rewrite cpu/generic/atomic_word.h

Ramana Radhakrishnan ramana.gcc@googlemail.com
Fri Jun 12 09:30:00 GMT 2015

On Fri, Jun 12, 2015 at 10:06 AM, Jonathan Wakely <jwakely@redhat.com> wrote:
> On 11/06/15 23:56 +0200, Torvald Riegel wrote:
>>> > On Fri, 2015-05-22 at 12:37 +0100, Ramana Radhakrishnan wrote:
>>> I don't think we can remove _GLIBCXX_READ_MEM_BARRIER and
>>> _GLIBCXX_WRITE_MEM_BARRIER from atomic_word.h even though they are
>>> superseded by the atomics as it is published in the documentation as
>>> available macros.
>> I see.  We should at least update the documentation of those, as the
>> current one isn't a really portable specification.  If we can, I'd
>> deprecate them.  Jonathan, what do you think?
> Yes, I'm in favour of deprecating them. They are GCC-specific anyway,
> so there is no reason to prefer them to std::atomic_ or __atomic_
> fences.

I'll treat it as a follow-up.

Can I get an ack for this patch though ? I could backport this as is
to fix the problems on ARM / AArch64 (PR target/66200) - alternatively
I'll provide header implementations of the same for the release


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