https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78485
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- Warning is not done at compile time but is handled at runtime via the sanitizers: -fsanitize-address-use-after-scope Enable sanitization of local variables to detect use-after-scope bugs. The option sets -fstack-reuse to ‘none’.
