[gcc v2] Enable some features for RTEMS in libstdc++

[Sebastian Huber]

On 22/06/2022 08:36, Chris Johns wrote:
>> The patch works also for GCC 12. I only did a test run of the RTEMS tests.
> It failed to apply for me with the gcc-12 for rtems6. The configure pieces did
> not apply.

I tested with the GCC 12 branch, maybe there are some configure changes 
compared to the RSB version. I will update the GCC 12 snapshot.

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