reent.h

[Artem B. Bityuckiy]

Jeff Johnston wrote:
>> 1. Does Newlib really take care about binary compatibility?
> In this particular case, care was taken to see that the entire library 
> didn't require recompiling everytime a new reentrancy field was added.  
> Newlib hasn't got proper dependency statements in its make files so 
> moving all the reentrancy fields around requires almost a complete 
> rebuild; the makefiles do not catch this.  At the time, the old malloc 
> area was still in place but not being used so the first change started 
> to reclaim the area with the union.
> 
>> 2. I want to add new fields to struct _reent. Do I need to add these 
>> fields to _reent field of _new union to support binary compatibility? 
>> May I not to care about binary compatibility and have no problems 
>> during future contributions to Newlib?
> 
> 
> Add them there in the non-reent-small case for the reason explained above.
> 
>> 3. In case of REENT_SMALL defined there is no reserved space in struct 
>> _reent. Should I use struct misc_reent * ?
>>
> 
> Yes, unless the new variables naturally belong with some of the other 
> groupings.  Remember to change the initialization code too.
Yes, I did this.
> 
> -- Jeff J.
> 
Ok, I've added my field to struct _misc.

We've implemented setlocale() and this field is _locale_t structure. But 
there is old locale-related field (_current_locale) present. It isn't 
needed anymore. We can't delete it without struct _reent size affecting. 
Should we just leave this field alone?

-- 
Best Regards,
Artem B. Bityuckiy,
St.-Petersburg, Russia.