[PATCH] Remove use of _global_impure_ptr

[Sebastian Huber]

On 04/05/2022 17:22, Dave Nadler wrote:
> On 5/4/2022 9:34 AM, Corinna Vinschen wrote:
>> Hi Sebastian,
>>
>> On May  3 15:40, Sebastian Huber wrote:
>>> Remove the pointer indrection through the read-only 
>>> _global_impure_ptr and
>>> directly use a globally visible _impure_data object of type struct 
>>> reent.  This
>>> enables the static initialization of global data structures in a 
>>> follow up
>>> patch.  In addition, we get rid of a machine-specific file.
>> the patch looks good.  I just wonder if we really need the
>> impure-compat.c file.  Backward-compat is no problem for embedded stuff,
>> and Cygwin doesn't expose _global_impure_ptr to user space either.
>>
>> If there's no other compelling reason, you can just drop it and push
>> the rest.
>>
>> Thanks,
>> Corinna
> 
> Apologies if this is a dumb question, but this patch does not
> affect the use of the global _impure_ptr, right? For example
> FreeRTOS allocates a reentrancy structure for each task and switches
> _impure_ptr on context switches.

This patch doesn't change the behaviour of _impure_ptr.  The _impure_ptr 
is initialized to point to a global struct _reent object.  Now, this 
object is externally visible.

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