[gcc] Enable TLS support for RTEMS in libstdc++

[Chris Johns]

On 9/6/2022 4:16 pm, Sebastian Huber wrote:
> On 08/06/2022 16:18, Sebastian Huber wrote:
>> On 08/06/2022 16:11, Joel Sherrill wrote:
>>> On Wed, Jun 8, 2022 at 8:47 AM Sebastian Huber
>>> <sebastian.huber at embedded-brains.de
>>> <mailto:sebastian.huber at embedded-brains.de>> wrote:
>>>
>>>     On 08/06/2022 15:39, Joel Sherrill wrote:
>>>      > Is TLS actually supported on all targets except MIPS?
>>>
>>>     I only added MIPS since this target has a fundamental issue with the
>>>     TLS
>>>     support.
>>>
>>>     Which target would you also exclude?
>>>
>>> About half of them.
>>
>> It seems to be only bfin, lm32, moxie, or1k, and v850. Are these targets still
>> in use? Do we have a maintainer for these targets?
> 
> How do we want to proceed here? Add them to the exclude list in the GCC
> configuration, or encourage current or future users of these targets to add the
> TLS support so that they can use state of the art C++ support? The initial TLS
> support for RTEMS was added in 2013, so this is not really brand new technology.

I think we should support TLS in C++ for the targets we know work and any others
can use the eh_globals support. It does work and works OK with POSIX keys.

How we document this is probability a more pressing question? I cannot see any
language specific areas in the User or Classic API manuals.

Chris