Bug fix 12730: Add support for __GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1, 2, 4, 8} on ARM

[Eli Friedman]

On Sat, Aug 31, 2013 at 11:51 PM, <weimingz at codeaurora.org> wrote:

> Hi,
>
> The orignal patch (r178816) fixed bug 12730 for x86. This patch adds the
> same macro definitions "__GCC_HAVE_SYNC_COMPARE_AND_SWAP_{1,2,4,8}" to ARM
> target to address the same issue.
>
> Please help to review it.
>
>
Is there any way we can compute the correct setting for these macros in a
target-independent code?  IIRC, targets already expose some information
about atomics.

-Eli
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