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

[Yannick Brosseau]

On 2012-01-06 10:38, 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. This check
> would be acceptable if:
>
> 2) it would additionally have gcc version checks for those which had a
>    broken implementation in the first gcc versions.
>
Do we have a list of broken gcc or a mean to test that they are broken?