[Bug c/107405] [13 Regression] enum change causing Linux kernel to fail to build due to Linux depending on old behavior

[joseph at codesourcery dot com]

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).