https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119077
Uwe Lohmann <ul...@t-online.de> changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|--- |WORKSFORME Status|WAITING |RESOLVED --- Comment #8 from Uwe Lohmann <ul...@t-online.de> --- * I deleted the complete avr toolchain and rebuilt everything. avr-gcc was built in accordance to https://gcc.gnu.org/install/configure.html. Result: no change, still the reported error * I originally used avr-libc-2.1.0. After the change described in https://github.com/avrdudes/avr-libc/commit/5e6f28bd436e6f9749ecc5bc47f9035f1c1e7423, the error disappeared. Updated avr-lib to avr-libc-2.2.1; removed the prototypes as described in the link above. Result: Now OK. Thanks for the support. Issue closed.