https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105753
fiesh at zefix dot tv changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |fiesh at zefix dot tv --- Comment #8 from fiesh at zefix dot tv --- Created attachment 54054 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54054&action=edit Two preprocessed files reproducing the issue only at -O3 I seem to also have run into this bug, but maybe my test case is different. Compiling like this results in the same ICE: % avr-g++ -O3 -o pheat pheat-IPAddress.ii pheat-Print.ii -flto -mmcu=atmega2560 A lower optimization level does not suffice to trigger it.