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Tom Lane 92cf557ffa Add static assertion that RELSEG_SIZE fits in an int. 
Our configure script intended to ensure this, but it supposed that
expr(1) would report an error for integer overflow.  Maybe that
was true when the code was written (commit 3c6248a82 of 2008-05-02),
but all the modern expr's I tried will deliver bigger-than-int32
results without complaint.  Moreover, if you use --with-segsize-blocks
then there's no check at all.

Ideally we'd add a test in configure itself to check that the value
fits in int, but to do that we'd need to suppose that test(1) handles
bigger-than-int32 numbers correctly.  Probably modern ones do, but
that's an assumption I could do without; and I'm not too trusting
about meson either.  Instead, let's install a static assertion, so
that even people who ignore all the compiler warnings you get from
such values will be forced to confront the fact that it won't work.

This has been hazardous for awhile, but given that we hadn't heard
a complaint about it till now, I don't feel a need to back-patch.

Reported-by: Casey Shobe <casey.allen.shobe@icloud.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/C5DC82D6-C76D-4E8F-BC2E-DF03EFC4FA24@icloud.com
2025-10-19 18:28:46 -04:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
contrib Allow role created by new test to log in on Windows. 2025-10-18 18:36:21 -04:00
doc doc: Clarify when backend_xmin in pg_stat_replication can be NULL. 2025-10-17 14:03:42 +09:00
src Add static assertion that RELSEG_SIZE fits in an int. 2025-10-19 18:28:46 -04:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml Revert "Improve docs syntax checking" 2025-10-06 07:53:31 -04:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:54:03 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add script to keep .editorconfig in sync with .gitattributes 2025-02-01 10:09:45 +01:00
.git-blame-ignore-revs Add commit 7e9c216b52 to .git-blame-ignore-revs. 2025-09-13 14:55:38 -05:00
.gitattributes Fix git whitespace warning 2025-08-15 10:32:35 +02:00
.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 Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
configure.ac Remove traces of support for Sun Studio compiler 2025-09-12 07:39:05 +02:00
COPYRIGHT Align organization wording in copyright statement 2025-05-16 11:20:07 -04:00
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 Fix meson build with -Duuid=ossp when using version older than 0.60 2025-09-22 08:03:23 +09:00
meson_options.txt Add support for basic NUMA awareness 2025-04-07 23:08:17 +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/.