Re: Fix C23 compiler warning

On 20.10.24 17:56, Tom Lane wrote:
> Peter Eisentraut <peter@eisentraut.org> writes:
>> This no longer works because in C23, because an empty argument list is
>> now equivalent to (void), rather than an indeterminate one as before.
>> And so this results in an incompatible function pointer type and
>> compiler warnings.  (gcc and clang agree on this.)
> 
>> I think we can fix this easily with a few struct forward declarations,
>> preserving the goal of not including extra header files, like this:
> 
> Do the struct declarations themselves need comments?  Other
> places do this like
> 
> struct PlannerInfo;                /* avoid including pathnodes.h here */
> 
> LGTM other than that nit.

Committed with that change.  Thanks.