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Tom Lane e3d77ea6b4 Prevent mis-linking of src/port and src/common functions on *BSD. 
On ELF-based platforms (and maybe others?) it's possible for a shared
library, when dynamically loaded into the backend, to call the backend
versions of src/port and src/common functions rather than the frontend
versions that are actually linked into the shlib.  This is the cause
of bug #15367 from Jeremy Evans, and is likely to lead to more problems
in future; it's accidental that we've failed to notice any bad effects
up to now.

The recommended way to fix this on ELF-based platforms is to use a
linker "version script" that makes the shlib's versions of the functions
local.  (Apparently, -Bsymbolic would fix it as well, but with other
side effects that we don't want.)  Doing so has the additional benefit
that we can make sure the shlib only exposes the symbols that are meant
to be part of its API, and not ones that are just for cross-file
references within the shlib.  So we'd already been using a version
script for libpq on popular platforms, but it's now apparent that it's
necessary for correctness on every ELF-based platform.

Hence, add appropriate logic to the openbsd, freebsd, and netbsd stanzas
of Makefile.shlib; this is just a copy-and-paste from the linux stanza.
There may be additional work to do if commit ed0cdf0e0 reveals that the
problem exists elsewhere, but this is all that is known to be needed
right now.

Back-patch to v10 where SCRAM support came in.  The problem is ancient,
but analysis suggests that there were no really severe consequences
in older branches.  Hence, I won't take the risk of such a large change
in the build process for older branches.

In passing, remove a rather opaque comment about -Bsymbolic; I don't
think it's very on-point about why we don't use that, if indeed that's
what it's talking about at all.

Patch by me; thanks to Andrew Gierth for helping to diagnose the problem,
and for additional testing.

Discussion: https://postgr.es/m/153626613985.23143.4743626885618266803@wrigleys.postgresql.org
2018-09-09 15:17:01 -04:00
config Remove test for VA_ARGS, implied by C99. 2018-08-24 10:41:45 -07:00
contrib Make contrib/unaccent's unaccent() function work when not in search path. 2018-09-06 10:49:45 -04:00
doc Improve behavior of to_timestamp()/to_date() functions 2018-09-09 21:19:51 +03:00
src Prevent mis-linking of src/port and src/common functions on *BSD. 2018-09-09 15:17:01 -04:00
.dir-locals.el Update documentation editor setup instructions 2018-07-13 21:23:41 +02:00
.gitattributes
.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 Refactor dlopen() support 2018-09-06 11:33:04 +02:00
configure.in Refactor dlopen() support 2018-09-06 11:33:04 +02:00
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
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README
README.git

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/.