[lttng-dev] [liburcu PATCH 3/3] Add configure check for GCC atomic builtins

[Alexandre Montplaisir]

On 12-01-06 10:38 AM, Mathieu Desnoyers wrote:
> * Alexandre Montplaisir (alexandre.montplaisir at gmail.com) wrote:
>> I tested it on x86_64, this should be tested on other arches before
>> merging, namely to make sure it catches GCC version below 4.4 on ARM.
> We don't use these builtins on x86, we use our own implementation
> instead.
> This check does not take into account that some gcc versions
> support the builtin, and compile something out of it, but the semantic
> of the barrier is wrong, which will lead to runtime races.

Oh ok, I didn't know that. A straightforward GCC version-check would 
probably be better in this case.



-- 
Alexandre Montplaisir
DORSAL lab,
École Polytechnique de Montréal