Optionally use thread-local objects for struct _reent members

[Sebastian Huber]

On 10/01/2022 13:56, Corinna Vinschen wrote:
>> The member access macros are incomplete. We would have to add macros for all
>> the struct _reent members. Would this be an approach acceptable for Newlib
>> integration?
> I think this would be acceptable, provided that the current
> implementation stays available.

The existing struct _reent implementation will be still the default. 
Targets will get a new configuration option (for example 
_REENT_THREAD_LOCAL) to use thread-local objects instead of members in a 
structure. There will be several of new _REENT_XZY(ptr) macros to enable 
this alternative implementation.

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