RTEMS | poll.h is in both rtems and newlib (#5126)

[Joel Sherrill (@joel)]

Joel Sherrill commented on a discussion: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5126#note_111936


poll.h is from POSIX and was already there by the mid-90s (Issue 4, Version 2).

There is a proposal which has been around a while for C++ networking "extensions". This is supposed to be on track for C++23 or the next version per some discussion I found.

https://en.cppreference.com/w/cpp/experimental/networking

Ultimately, including as many POSIX headers as possible in newlib lets us build run-times and support packages without building the BSP first. We used to have to do that for some GNU languages. 

It also has a maintenance benefit as, in some cases, we end up sharing the header with Cygwin.

I will post an MR to remove poll.h from RTEMS before the end of the week.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/issues/5126#note_111936
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