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C++ 11 support for RT-Thread

Features

Here are some features about rt-thread c++11 threading futures.

Atomic.
Conditional variables.
Clocks.
Future.
Mutexes.
Threads.
TLS.

How To Use

Note that using C++ 11 in rt-thread requires modifying some of the files in the toolchain. Before modifying the tool, back up the tool chain.

Enable c++11 support

Download toolchain GCC 10.2.1:

gcc version 10.2.1 20201103 (release) (GNU Arm Embedded Toolchain 10-2020-q4-major)

Delete the following files:

rm -f toolchain/arm-none-eabi/include/c++/10.2.1/thread
rm -f toolchain/arm-none-eabi/include/c++/10.2.1/mutex
rm -f toolchain/arm-none-eabi/include/c++/10.2.1/condition_variable
rm -f toolchain/arm-none-eabi/include/c++/10.2.1/future
rm -f toolchain/arm-none-eabi/include/pthread.h

Clear the contents of the following files and keep them to prevent compilation failures:
```
toolchain/arm-none-eabi/include/sys/_pthreadtypes.h
```

Update rtconfig.py file. add compilation parameters:

CXXFLAGS = CFLAGS  + ' -std=c++11 -fabi-version=0 -MMD -MP -MF'