6369e89502
* [posix] POSIX standard implementation for PSE51 - add some posix's interfaces that we haven't before. - these PR have passed the interface definition test across gcc platfrom; - have tested base on qemu-a9 and stm32h750-art-pi. * [newlib] only enable POSIX.1-1990 * update projects
NEWLIB (GCC) porting for RT-Thread
Please define RT_USING_LIBC and compile RT-Thread with GCC compiler.