Re: Detection of hadware feature => please do not use signal

Thomas Munro <thomas(dot)munro(at)gmail(dot)com> writes:
> On Fri, Nov 1, 2024 at 7:25 AM Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
>> It occurs to me to wonder whether the existing code works on Windows.
>> Windows-on-ARM wasn't a thing we thought about in 2018, but it's
>> a reasonable target now.

> I looked into that[1] and decided that I was going to ignore it
> completely, because:
> [ oodles o' details ]

Hmm. So it seems like we could do this:

* Linux, FreeBSD, OpenBSD: do run-time test as recommended
* Windows, macOS: assume that supported ARM hardware can do this
* anything else: assume no hardware CRC

The only thing I'd be even a bit sad about there is not having
NetBSD support. Maybe we just need to research that a bit more,
or maybe we have to wait for/lobby for them to do what the other
BSDen have done. But in any case I'm not seeing NetBSD-on-ARM
as a platform that's important enough to block movement on this,
let alone anything else in the "anything else" category.

An alternative to "assume no hardware CRC" could be

* anything else: use the existing SIGILL test

But I do sympathize with Bastien's concerns about that.

regards, tom lane