系統 - FreeRTOS - Build FreeRTOS

參考資訊：
https://github.com/FreeRTOS/FreeRTOS
https://stackoverflow.com/questions/10542618/building-freertos-for-x86
https://www.freertos.org/Documentation/02-Kernel/03-Supported-devices/04-Demos/03-Emulation-and-simulation/Linux/FreeRTOS-simulator-for-Linux

$ cd
$ git clone https://github.com/FreeRTOS/FreeRTOS --recursive
$ cd FreeRTOS/Demo/Posix_GCC
$ make -j4
$ ./build/posix_demo
    Trace started.
    The trace will be dumped to disk if a call to configASSERT() fails.
    Starting full demo
    OK: No errors - tick count 10001
    OK: No errors - tick count 20001