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

[segher at gcc dot gnu.org]

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

--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
The initialisation (the call to f1) could have a side effect, but the
a==1 case skips that.  GCC is right to warn here in my opinion.