https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116892
Richard Earnshaw <rearnsha at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords|ice-on-valid-code |ice-on-invalid-code --- Comment #8 from Richard Earnshaw <rearnsha at gcc dot gnu.org> --- Forward declarations of enums in C requires c23, when you can use the size type specifier. For earlier versions this isn't valid code.