Hello, LLVM is becoming more popular and AVR is not in an experimental state anymore. So I decided to build the avr-libc with LLVM. GCC may lose the AVR backend in the future. So I think LLVM would be a good choice for the future.
To build the avr-libc only small changes were needed. Like AS compiler flags and some compiler checks. The biggest change concerns the PROGMEM concept. My changes don't break existing code. Is someone interested in this topic? The following link contains a successful build with LLVM/Clang version 11 and all changes: https://drive.google.com/file/d/1kdleWpsmwbSZyXUQ0tp-DHu0jKABRLuQ/view?usp=sharing Br Andreas
