Arduino can be built with C20/C++20 or C17/C++17 by switching to the latest gcc-arm-none-eabi. Below shows 2 different ways one using arduino-cli and the other using a Makefile included in this repo.

What do you program the Arduino in? C? Actually, the Arduino’s byzantine build processes uses C++. All the features you get from the normal libraries are actually C++ classes. The problem is … ...

For many embedded C developers the most predominate and questionable feature of C++ is the class. The concern is that classes are complex and therefore will introduce code bloat and increase runtim… ...

Arduino's language is based on C++, which is one of the most popular programming languages used by developers today. C++ is geared towards larger apps and is responsible for some of the code ...

It is on "conversion" of a C example code into C++ code or, better, on creation of a C++ wrapper around the original code such that it can be built and flashed from the ESP-IDF environment as C++ code ...