AlxrMironov_oldAcc

I've has found, that build fails at "volatile" error. Since C++20 some ```volatile``` keyword use cases is deprecated and without ```Wno-error=volatile``` flag - build will fail. ``` error: compound assignment...

> @alxrMironov would 9 accept noerror=volatile? No, it doesnt. "No option" error. Also, with ```-Wno-error=volatile``` at ```GCC 10``` the build output is over-polluted by warnings.