import RT-Thread@9217865c without bsp, libcpu and components/net

components/libc/cplusplus/cpp11/README_ZH.md

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+# cpp 11 support for rt-thread
+
+## 特性
+
+下面是 RT-Thread 支持的 C++ 11 线程特性。
+
+- Atomic.
+- Conditional variables.
+- Clocks.
+- Future.
+- Mutexes.
+- Threads.
+- TLS.
+
+## 如何使用
+
+请注意，在 RT-Thread 中使用 C++ 11，需要修改工具链中的部分文件。请在修改之前，备份好工具链。
+
+1. 使能 c++11
+   ![](figures/Snipaste_2021-09-02_16-00-09.png)
+
+2. 下载 GCC 工具链
+
+   ```shell
+   gcc version 10.2.1 20201103 (release) (GNU Arm Embedded Toolchain 10-2020-q4-major)
+   ```
+
+3. 删除下面的文件
+
+   ```shell
+   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
+   ```
+
+4. 请清除下面文件的内容，保留文件避免编译失败
+
+   ```shell
+   toolchain/arm-none-eabi/include/sys/_pthreadtypes.h
+   ```
+
+5. 更新 `rtconfig.py` 文件，添加 c++ 编译参数:
+
+   ```shell
+   CXXFLAGS = CFLAGS  + ' -std=c++11 -fabi-version=0 -MMD -MP -MF'
+   ```