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: 2024-11-24T00:08:55Z
Lists: pgsql-bugs 
Thomas Munro <thomas.munro@gmail.com> writes:
> On Sun, Nov 24, 2024 at 11:02 AM Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> cc1: error: '-mfloat-abi=hard': selected processor lacks an FPU

> Interesting.  Happens also on Linux starting with GCC 11, apparently.
> Here's one with some clues:
> https://github.com/checkpoint-restore/criu/issues/1653#issuecomment-986034428

Oh, very interesting!  Maybe we need to try -march=armv8-a+crc+fp
(or some spelling like that) if -march=armv8-a+crc doesn't work?

			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.