[Bug rtl-optimization/116780] [lra][avr] internal compiler error: output_operand: address operand requires constraint for X, Y, or Z register

[segher at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116780

--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to denisc from comment #2)
> Comment on attachment 59393 [details]
> Simplified testcase
> 
> void
> f ()
> {
>   volatile char c[0];
>   c[0] = 0;
> }

That is invalid C code, of course (an out of bounds access).