Horton

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

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Thomas Munro <thomas.munro@gmail.com>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>, Bastien Roucariès <rouca@debian.org>, pgsql-bugs@lists.postgresql.org
Date: 2024-11-25T22:40:10Z
Lists: pgsql-bugs 
I wrote:
> And done.  In the event I decided to try the +simd option first,
> reasoning that that's correct on the majority of current ARM systems.
> I'm interested to see what the older buildfarm ARM animals pick.

Early returns are that they're all picking the +simd option, and
seem to be just as happy with that as they were without it.
I wonder if we could just drop the "without" probe altogether.
It'd save some configure cycles for other platforms (since they'll
fruitlessly run through all of these tests).

			regards, tom lane

Commits

  1. Update configure probes for CFLAGS needed for ARM CRC instructions.

  2. Support runtime CRC feature probing on NetBSD/ARM using sysctl().

  3. Use auxv to check for CRC32 instructions on ARM.

  4. Improve our method for probing the availability of ARM CRC instructions.