https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106762
qinzhao at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |qinzhao at gcc dot gnu.org --- Comment #4 from qinzhao at gcc dot gnu.org --- adding -fdisable-tree-isolate-paths makes the warning disappearing. I agree that GCC does catch the bug in the attached testing case as commented in comment #1. This is a similar issue as PR109071. it might be better to provide more information to the end-user in the diagnostic.