Re: Remove useless casts to (void *)

On Tue, Dec 3, 2024 at 7:06 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> This is from hake[1], which is running OpenIndiana/illumos.
> That platform shows a couple of other strange warnings, so maybe
> re-eliminating these two is not worth worrying about, but
> nonetheless the casts to void * were doing something here.

I wouldn't change that.  illumos is selecting the old pre-standard
declaration here, but it knows the standard one:

https://github.com/illumos/illumos-gate/blob/27ecbff00d8c86a2647d6fe325cacb220d712115/usr/src/uts/common/sys/shm.h#L129
https://illumos.org/man/2/shmdt

I don't know why we have only one tiny issue if the system headers
think we want pre-POSIX stuff.  I wonder if the particular header has
incorrect guarding, but I don't know how that is supposed to work.