https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107405
--- Comment #17 from joseph at codesourcery dot com <joseph at codesourcery dot com> --- On Sat, 19 Nov 2022, macro at orcam dot me.uk via Gcc-bugs wrote: > If in older C standard versions such enums are invalid, then I think > this should be a hard error rather than a silent ABI change for the code > produced. Not all code out there will have sanity checks such as the There is no ABI change. The size of the enum type does not change. What changes is the type given to enum constants in such an enum, if the value of the enum constant fits in int (now all enum constants in such an enum have the enum type rather than only those outside the range of int having the enum type).
