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Andres Freund d1211c63f0 Add macro to cast away const without allowing changes to underlying type. 
The new unconsitify(underlying_type, var) macro allows to cast
constness away from a variable, but doesn't allow changing the
underlying type.  Enforcement of the latter currently only works for
gcc like compilers.

Please note IT IS NOT SAFE to cast constness away if the variable will ever
be modified (it would be undefined behaviour). Doing so anyway can cause
compiler misoptimizations or runtime crashes (modifying readonly memory).
It is only safe to use when the the variable will not be modified, but API
design or language restrictions prevent you from declaring that
(e.g. because a function returns both const and non-const variables).

This'll be used in an upcoming change, but seems like it's independent
infrastructure.

Author: Andres Freund
Discussion: https://postgr.es/m/20181015200754.7y7zfuzsoux2c4ya@alap3.anarazel.de
2018-10-16 12:05:50 -07:00
config Select appropriate PG_PRINTF_ATTRIBUTE for recent NetBSD. 2018-10-09 11:10:07 -04:00
contrib Improve stability of recently-added regression test case. 2018-10-16 12:01:18 -04:00
doc pgbench: Report errors during run better 2018-10-15 10:34:35 +02:00
src Add macro to cast away const without allowing changes to underlying type. 2018-10-16 12:05:50 -07:00
.dir-locals.el Update documentation editor setup instructions 2018-07-13 21:23:41 +02:00
.gitattributes Remove contrib/tsearch2. 2017-02-13 11:06:11 -05:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
aclocal.m4 Add configure infrastructure (--with-llvm) to enable LLVM support. 2018-03-20 17:26:25 -07:00
configure Select appropriate PG_PRINTF_ATTRIBUTE for recent NetBSD. 2018-10-09 11:10:07 -04:00
configure.in Convert some long lists in configure.in to one-line-per-entry style. 2018-10-09 00:04:38 -04:00
COPYRIGHT Update copyright for 2018 2018-01-02 23:30:12 -05:00
GNUmakefile.in Remove unwanted "garbage cleanup" logic in Makefiles. 2018-08-08 14:32:29 -04:00
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 00:57:22 -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

README 

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/.