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Tom Lane db87d3b525 Make checksum_impl.h safe to compile with -fstrict-aliasing.
In general, Postgres requires -fno-strict-aliasing with compilers that
implement C99 strict aliasing rules.  There's little hope of getting
rid of that overall.  But it seems like it would be a good idea if
storage/checksum_impl.h in particular didn't depend on it, because
that header is explicitly intended to be included by external programs.
We don't have a lot of control over the compiler switches that an
external program might use, as shown by Michael Banck's report of
failure in a privately-modified version of pg_verify_checksums.

Hence, switch to using a union in place of willy-nilly pointer casting
inside this file.  I think this makes the code a bit more readable
anyway.

checksum_impl.h hasn't changed since it was introduced in 9.3,
so back-patch all the way.

Discussion: https://postgr.es/m/1535618100.1286.3.camel@credativ.de
2018-08-31 12:27:22 -04:00
config MSVC: Test whether 32-bit Perl needs -D_USE_32BIT_TIME_T. 2017-12-08 18:14:08 -08:00
contrib pg_upgrade: issue helpful error message for use on standbys 2018-08-17 10:25:48 -04:00
doc doc: add doc link for 'applicable_roles' 2018-08-25 13:01:24 -04:00
src Make checksum_impl.h safe to compile with -fstrict-aliasing. 2018-08-31 12:27:22 -04:00
.gitignore Add /config.cache to .gitignore in back branches 2017-02-25 13:04:22 -05:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Stamp 9.3.24. 2018-08-06 16:13:40 -04:00
configure.in Stamp 9.3.24. 2018-08-06 16:13:40 -04:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Don't generate plain-text HISTORY and src/test/regress/README anymore. 2014-02-10 20:48:12 -05:00
HISTORY Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
Makefile Fix non-GNU makefiles for AIX make. 2017-11-30 00:57:32 -08:00
README Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00
README.git Change documentation references to PG website to use https: not http: 2017-05-20 21:50:47 -04:00

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.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

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