https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67051
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Severity|normal |enhancement Ever confirmed|0 |1 Last reconfirmed| |2022-01-06 Status|UNCONFIRMED |NEW --- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Confirmed testcase: int i; int j; int f(void) { return &i != &j; } Compile with -O2 -fcommon and you will see the problem. Note this might be less important now that -fno-common is the default.