POSIX Compilance- #2966, GSoC Project 2019

[Vaibhav Gupta]

On Sun, Mar 17, 2019 at 6:25 AM Gedare Bloom <gedare at rtems.org> wrote:

> Hi Vaibhav,
>
> Please try to use plain text mode in your post, the font sizes are
> hard to read. More below.
>
Okay, I will re-send the mail with plain text mode on mailing list.

>
> On Sat, Mar 16, 2019 at 3:50 PM Vaibhav Gupta <vaibhavgupta40 at gmail.com>
> wrote:
> >
> > Hello,
> > As mentioned by Dr Joel that high priority is to be given to
> implementations missing in FACE GPP 3.0.
> > So, I have got FACE Technical Standard 3.0 pdf downloaded. And its
> pretty easy to compare tickets now.
> > .
> > And while exploring big picture I got many questions:
> >
> > 1 - It is mentioned in the ticket #2966, "RTEMS POSIX Compliance is
> achieved via a combination of methods and .h files in RTEMS and the newlib
> C Library." .
> > So, if a method or a header is present in Newlib C, it is not required
> to be present in RTEMS library? But that would mean Newlib is directly
> ported to RTEMS.
> > .
> > > I had an off-list talk with Vijay, he proved to be very helpful. I
> asked him same question (question 1), I would like to conclude what we
> discussed.
> >
> > > He told that "RTEMS uses its own version of Newlib C as it cannot
> directly mirror original Newlib as, if methods change the way it works,
> they can break RTEMS".
> >
> > > But then my doubt was, if that's the case, why keep modified headers
> of original Newlib under separate Newlib C folder in RTEMS? Why not
> directly include them in RTEMS library? (As I found newlib-1d35a003f.tar.gz
> in {RTEMS-ROOT}/rsb/rtems/sources/    )
> > .
> > > To which he replied,  "RTEMS version of newlib is being used as a
> libraby of RTEMS only and the posix functions are being linked to this
> newlib"
> > .
> > 2- So, My second doubt is that our target is to contribute to Newlib C
> or RTEMS Library? Or we will add methods to Newlib C and link them to RTEMS?
> >
>
> The goal is to add whatever can be added to the Newlib C, it will
> eventually make its way into RTEMS (when we bump to a snapshot/release
> of newlib that includes the addition). We prefer to try to get this
> POSIX stuff implemented in Newlib.  For this, you might want to see if
> you can get some advice from Aditya who went through this process 2
> years ago or so.
>
Thanks Gedare, I will try to connect with him.

>
> Gedare
>
> > Thanks
> > Vaibhav Gupta
> > _______________________________________________
> > devel mailing list
> > devel at rtems.org
> > http://lists.rtems.org/mailman/listinfo/devel
>
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