Hello again, so sad i'm not using Your standard-library anymore. I have -fno-stdinc, -fno-stdinc++ and -fno-stdlib now. Exceptions are not working, but unwinding with Dwarf seems to be brilliant and easy. A few more days at home and i got it working. You can find my Blink example on GitHub in a few weeks. What i'm still missing is a simple String-constructor, can You help me? auto str=new String("abc") String::String(char const* str) doesn't do the trick, what would really help is a new constructor. String::?String(char const* str) It could return the required size and You could call String::=(size_t len, char const* str) Is this already possible somehow? After so many years? Friendly regards, Sven