Update POSIX compliance guide

[Gedare Bloom]

Hi Eshan,

We can work with the newlib community. Some things can be done in
newlib that are only for RTEMS, while some things we should share with
others, and still more code may be not useable by RTEMS (e.g., what is
in sys/linux). It is best to try to make common code available, but if
some code has to be specialized for RTEMS differently than how it
works in other systems then we can do that.

Gedare

On Wed, Mar 25, 2020 at 11:06 AM Eshan Dhawan <eshandhawan51 at gmail.com> wrote:
>
> I will check the musl for a more RTEMS  supported implementation.
> but will newlib change the implementation??
>
> On Wed, Mar 25, 2020 at 8:26 PM Joel Sherrill <joel at rtems.org> wrote:
>>
>>
>>
>> On Sun, Mar 22, 2020 at 2:00 PM Eshan Dhawan <eshandhawan51 at gmail.com> wrote:
>>>
>>> I have also checked wordexp.h is completely present in newlib (libc/include)
>>> the implementation of the functions wordexp.c and wordfree.c  is in (libc/posix)
>>> But the compliance status shows not supported.
>>
>>
>> I don't see them in libc.a for the sparc:
>>
>> lib_a-wordexp.o:
>>
>> lib_a-wordfree.o:
>>
>>
>> It is not included in RTEMS because the newlib implementation requires multiple
>> processes. It uses fork() and pipes.
>>
>> Maybe MUSCL has an implementation that is embedded friendly but the compliance
>> guide is correct.
>>
>> --joel
>>
>>>
>>>
>>>
>>> On Sat, Mar 21, 2020 at 11:31 PM Joel Sherrill <joel at rtems.org> wrote:
>>>>
>>>>
>>>>
>>>>
>>>> On Sat, Mar 21, 2020, 8:47 AM Eshan Dhawan <eshandhawan51 at gmail.com> wrote:
>>>>>
>>>>> Hello everyone
>>>>>
>>>>> I went through the POSIX Compliance guide and it showed that  wcsncasecmp_l () was not supported in wchar.h
>>>>> But when I checked newlib it had been implemented in libc/string
>>>>> so I think it needs to be updated in the docs.
>>>>
>>>>
>>>> Thanks for spotting this. I did a spot check and think there were a few more wc* methods that were not in the spreadsheet. I am going to post a patch in a bit.  Please check it.
>>>>
>>>> Obviously, this is a csv file maintained externally in a spreadsheet. If you put it in a spreadsheet, you can turn on data filtering based on the top row. Then you can do "queries" to do things like filter down to what's in a single header file. Or what's required in one standard but not in another.
>>>>
>>>> FWIW this turned into a bit of a rat hole. I tried to double check the newlib git repo and the link on their website is wrong after the upgrade of sourceware.org. Then checked gdb and it had the same issue. This resulted in also reporting some leftover cleanup from the recent upgrade of sourceware.org.
>>>>>
>>>>>
>>>>> Thanks
>>>>> Eshan
>
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