RT-Thread/rt-thread: https://github.com/RT-Thread/rt-thread.git @ 82f3a84ec8eae02c077df332ea3feedf899fffcb

Bernard Xiong be3b5a950f Merge pull request #4653 from mysterywolf/fixed-timezone		%!s(int64=4) %!d(string=hai) anos
..
none-gcc	cb7fa8fcea implement pid_t gettid(void)	%!s(int64=4) %!d(string=hai) anos
sys	1627597fcc remove _TIMESPEC_DEFINED	%!s(int64=4) %!d(string=hai) anos
SConscript	ae66d82624 update sconscript	%!s(int64=4) %!d(string=hai) anos
dirent.h	f9ba41f4c2 更改libc目录为common 以及 none-gcc	%!s(int64=4) %!d(string=hai) anos
readme.md	f9ba41f4c2 更改libc目录为common 以及 none-gcc	%!s(int64=4) %!d(string=hai) anos
stdlib.c	3c05a4e719 [compoenets] auto & manual formatted	%!s(int64=4) %!d(string=hai) anos
termios.h	3c05a4e719 [compoenets] auto & manual formatted	%!s(int64=4) %!d(string=hai) anos
time.c	be3b5a950f Merge pull request #4653 from mysterywolf/fixed-timezone	%!s(int64=4) %!d(string=hai) anos
unistd.c	19347ed454 [libc][unistd] 完善isatty()	%!s(int64=4) %!d(string=hai) anos

Attentions

This folder is "common" for all toolchains.
If you want to add new .c files, please do not forget to fix SConscript file too. eg:
```
if GetDepend('RT_USING_POSIX') == False:
    SrcRemove(src, ['unistd.c'])
```