https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120899
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Andrew Pinski from comment #2) > Note with -O2 -W -Wall we do get an uninitialized variable warning even: > > <source>:8:18: warning: 'argc.0' is used uninitialized [-Wuninitialized] > 8 | struct c a; > | ^ > <source>:6:9: note: 'argc.0' was declared here > 6 | }; > | ^ Sorry wrong bug report.