Eplankton

Not even "printf" is included in any standard, I'm afraid. Arm's Keil MDK toolchain has an typical implemetation of baremetal C/C++ environment called microlib, but unfortunately it doesn't support RTOS because of the missing of re-entrancy, so you have to provide or use a third-party alternative.

And apparently Segger Studio says NO to "old granpa style toolchain" by introduce this several weeks ago: https://www.segger.com/news/pr-240927-ozone-support-rust/

By now, only Cortex-M serires are tested, but the transportation to RISC-V(ESP32C-x series for a start) platform has been added to future todo-list, since I've split the layer between hardware abstraction and software kernel into `vendor-hal` and `kernel`, along with the user application layer `user`.

The original document is written in Chinese so far, and I'll release an English version with further development. But the major recognizable difference is the RAII-wrapper for many synchronous primitives like mutex/semaphore/message queue/spin-lock, also I've been trying to add async programming mechanism that is similar to those in Rust by taking advantage of C++20 coroutines, including an trivial implementation of future<T> that needs no dynamic allocation(which is crucial in embedded system context).