GSoC: Guidance for POSIX Compilance

[Aditya Upadhyay]

Hi Vaibhav,

I saw your doubts on devel mailing list regarding the newlib-c.
These are the points, you should know about newlib c and
why does most embedded system use newlib c as runtime library.

newlib c is used to provide supports to the different platforms and
architecute specific compilers.
For example:
if you have a compiled binary and that you want to run it on a
particular platform
then this newlib c is used by compiler to invoke some of the built-in functions
in that runtime environment.
Some low level routines are defined inside the newlib-cygwin that provides
architecture support. For example: Stack, Heap, memory management,
interrupt facilities is
defined in the newlib c and these implementation is architecture dependent.

On Sun, Mar 17, 2019 at 10:02 AM Vaibhav Gupta <vaibhavgupta40 at gmail.com> wrote:
>
> Hello Aditya,
>
> First of all Congratulations for your successful completion of POSIX Compilance Project in RTEMS in 2017.
> .
> I read your proposal and its impressive. You seem to have done lot of homework on RTEMS that
> time.
> .
> I am a 2nd year student from JIIT Noida and I am preparing to take same project (POSIX Compilance) this year for GSoC.
> .
> I had doubts and asked them on mailing list, then Gedare suggested me to take advice from you as you also went with same processes at your time which I am facing now.
> .
For more, You can look into this:
https://www.embedded.com/design/prototyping-and-development/4024867/Embedding-with-GNU-Newlib
Above link will help you to understand other term like reentrancy concept
when you will be going to provide supports in the multi-threaded environment.
To understand licensing terms, You can refer here. It will help to
figure out the
difference between the glibc, newlibc, klibc etc..
https://groups.google.com/forum/#!topic/native-client-discuss/_OAQsL77kPQ

> It would be great if you can help me out.
>
I would encourage you to test this inttypes test suite code, What
I have not yet committed. You just need to change some copyrights things.
It would be appreciated if you send a patch on devel. It will help you to
understand the code flow and relation between the newlib c and rtems.
inttypes methods test suite location:
https://drive.google.com/open?id=1vnb0KBhkYLTPzbRJPMuwsnyWLP694VAa

> Thanks
> Vaibhav Gupta

Thanks,
Aditya Upadhyay