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Thomas Munro aac831cafa Use auxv to check for CRC32 instructions on ARM. 
Previously we probed for CRC32 instructions by testing if they caused
SIGILL.  Some have expressed doubts about that technique, the Linux
documentation advises not to use it, and it's not exactly beautiful.
Now that more operating systems expose CPU features to userspace via the
ELF loader in approximately the same way, let's use that instead.

This is expected to work on Linux, FreeBSD and recent OpenBSD.
OpenBSD/ARM has not been tested and is not present in our build farm,
but the API matches FreeBSD.

On macOS, compilers use a more recent baseline ISA so the runtime test
mechanism isn't reached.  (A similar situation is expected for
Windows/ARM when that port lands.)

On NetBSD, runtime feature probing is lost for armv8-a builds.  It looks
potentially doable with sysctl following the example of the cpuctl
program; patches are welcome.

No back-patch for now, since we don't have any evidence of actual
breakage from the previous technique.

Suggested-by: Bastien Roucariès <rouca@debian.org>
Discussion: https://postgr.es/m/4496616.iHFcN1HehY%40portable-bastien
2024-11-22 21:45:25 +13:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Fix __attribute__((target(...))) usage. 2024-11-07 15:27:32 -06:00
contrib file_fdw: Add REJECT_LIMIT option to file_fdw. 2024-11-20 23:53:19 +09:00
doc doc: clarify how logical replication takes its initial snapshot 2024-11-21 17:14:33 -05:00
src Use auxv to check for CRC32 instructions on ARM. 2024-11-22 21:45:25 +13:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml Make PG_TEST_EXTRA env var override the "meson setup" option 2024-11-04 14:09:25 +02:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.git-blame-ignore-revs Add commit 7f7474a8e4 to .git-blame-ignore-revs. 2024-10-14 15:09:39 -05:00
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.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Use auxv to check for CRC32 instructions on ARM. 2024-11-22 21:45:25 +13:00
configure.ac Use auxv to check for CRC32 instructions on ARM. 2024-11-22 21:45:25 +13:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Use auxv to check for CRC32 instructions on ARM. 2024-11-22 21:45:25 +13:00
meson_options.txt Make PG_TEST_EXTRA env var override the "meson setup" option 2024-11-04 14:09:25 +02:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.