[Bug c/87038] diagnostics: Please add warning for jumping over initializers with switch/case in C mode

[steinar+gcc at gunderson dot no]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87038

--- Comment #11 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
It is also not legal (side effects or not) when compiling as C++, which is one
of the reasons for having this warning.