https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102276
--- Comment #12 from qinzhao at gcc dot gnu.org --- I will go with the following solution: 1. avoid emitting switch-unreachable warnings for -ftrivial-auto-var-init; 2. adding a new option -Wtrivial-auto-var-init to emit warnings for the switch-unreadable cases to suggest the user modify the source code; 3. update documentation of -ftrivial-auto-var-init for the limitation on switch-unreachable cases and introduce the new option -Wtrivial-auto-var-init with the above 1, we can resolve the current immediate issue of spurious warnings of using -ftrivial-auto-var-init to make kernel build succeed; with the above 2, we provide the user a way to know that -ftrivial-auto-var-init has limitation on the switch-unreachable cases, and user should modify the source code to avoid this problem; with the above 3, we will provide the user a clear documentation of the -ftrivial-auto-var-init and also provide suggestions how to resolve this issue. I will update my current patch with this. let me know if you have other comments and suggestions.
