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Tom Lane f6f75539d2 Prevent accidental linking of system-supplied copies of libpq.so etc. 
Back-patch commit dddfc4cb2, which broke LDFLAGS and related Makefile
variables into two parts, one for within-build-tree library references and
one for external libraries, to ensure that the order of -L flags has all
of the former before all of the latter.  This turns out to fix a problem
recently noted on buildfarm member peripatus, that we attempted to
incorporate code from libpgport.a into a shared library.  That will fail on
platforms that are sticky about putting non-PIC code into shared libraries.
(It's quite surprising we hadn't seen such failures before, since the code
in question has been like that for a long time.)

I think that peripatus' problem could have been fixed with just a subset
of this patch; but since the previous issue of accidentally linking to the
wrong copy of a Postgres shlib seems likely to bite people in the field,
let's just back-patch the whole change.  Now that commit dddfc4cb2 has
survived some beta testing, I'm less afraid to back-patch it than I was
at the time.

This also fixes undesired inclusion of "-DFRONTEND" in pg_config's CPPFLAGS
output (in 9.6 and up) and undesired inclusion of "-L../../src/common" in
its LDFLAGS output (in all supported branches).

Back-patch to v10 and older branches; this is already in v11.

Discussion: https://postgr.es/m/20180704234304.bq2dxispefl65odz@ler-imac.local
2018-07-09 17:23:32 -04:00
..
adminpack Fix potentially-unportable code in contrib/adminpack. 2018-04-15 13:02:12 -04:00
auth_delay Limit values of archive_timeout, post_auth_delay, auth_delay.milliseconds. 2012-11-18 17:15:06 -05:00
auto_explain Allow auto_explain.log_min_duration to go up to INT_MAX. 2018-02-23 14:39:23 -05:00
btree_gin Make contrib regression tests safe for Danish locale. 2016-07-21 16:52:36 -04:00
btree_gist Fix assorted issues in convert_to_scalar(). 2018-03-03 20:31:35 -05:00
chkpass Fix volatility markings of some contrib I/O functions. 2014-11-05 11:34:19 -05:00
citext Make contrib regression tests safe for Danish locale. 2016-07-21 16:52:36 -04:00
cube Fix typos in comments. 2017-02-06 11:34:28 +02:00
dblink Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:32 -04:00
dict_int Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
dict_xsyn Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
dummy_seclabel Update copyrights for 2013 2013-01-01 17:15:01 -05:00
earthdistance Fix typos in comments. 2017-02-06 11:34:28 +02:00
file_fdw Fix contrib/file_fdw's expected file 2015-03-06 11:47:09 -03:00
fuzzystrmatch Add missing va_end() call to a early exit in dmetaphone.c's StringAt(). 2015-01-04 15:35:47 +01:00
hstore Avoid formally-undefined use of memcpy() in hstoreUniquePairs(). 2017-11-25 14:42:46 -05:00
intagg Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
intarray Fix -e option in contrib/intarray/bench/bench.pl. 2016-08-17 15:51:10 -04:00
isn Fix typos in comments. 2017-02-06 11:34:28 +02:00
lo Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
ltree Spelling fixes 2017-03-14 13:45:45 -04:00
oid2name Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:32 -04:00
pageinspect Remove unused macros. 2016-05-02 10:09:03 +03:00
passwordcheck Update copyrights for 2013 2013-01-01 17:15:01 -05:00
pg_archivecleanup Fix new warnings from GCC 7 2017-05-15 13:31:38 -04:00
pg_buffercache Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
pg_freespacemap Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
pg_standby Fix new warnings from GCC 7 2017-05-15 13:31:38 -04:00
pg_stat_statements Avoid unlikely data-loss scenarios due to rename() without fsync. 2016-03-09 18:53:54 -08:00
pg_test_fsync Avoid depending on non-POSIX behavior of fcntl(2). 2017-04-21 15:55:56 -04:00
pg_test_timing Correctly handle test durations of more than 2147s in pg_test_timing. 2015-01-04 15:53:08 +01:00
pg_trgm Further fix pg_trgm's extraction of trigrams from regular expressions. 2017-04-14 14:52:03 -04:00
pg_upgrade Allow MSYS as well as MINGW in Msys uname 2018-05-04 15:05:28 -04:00
pg_upgrade_support Update copyrights for 2013 2013-01-01 17:15:01 -05:00
pg_xlogdump Use snprintf not sprintf in pg_waldump's timestamptz_to_str. 2018-06-16 14:45:47 -04:00
pgbench Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:32 -04:00
pgcrypto Rename base64 routines to avoid conflict with Solaris built-in functions. 2018-02-28 18:33:45 -05:00
pgrowlocks Fix handling of multixacts predating pg_upgrade 2016-06-24 18:29:28 -04:00
pgstattuple Remove unused macros. 2016-05-02 10:09:03 +03:00
postgres_fdw Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:32 -04:00
seg Fix typos in comments. 2017-02-06 11:34:28 +02:00
sepgsql Silence compiler warning in sepgsql 2017-04-06 14:24:50 -07:00
spi Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:32 -04:00
sslinfo Fix error message wording in previous sslinfo commit 2015-09-08 11:10:20 -03:00
start-scripts Provide modern examples of how to auto-start Postgres on macOS. 2017-11-17 12:47:44 -05:00
tablefunc Handle unexpected query results, especially NULLs, safely in connectby(). 2015-01-29 20:18:40 -05:00
tcn Remove tabs after spaces in C comments 2014-05-06 11:26:28 -04:00
test_parser Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
tsearch2 Fix typos in comments. 2017-02-06 11:34:28 +02:00
unaccent Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
uuid-ossp Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:46 +02:00
vacuumlo Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-07-09 17:23:32 -04:00
worker_spi worker_spi: Call pgstat_report_stat. 2016-09-28 12:40:23 -04:00
xml2 Fix typos in comments. 2017-02-06 11:34:28 +02:00
contrib-global.mk Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
Makefile contrib/Makefile also needs updated 2013-02-22 18:56:42 -03:00
README Update contrib/README 2012-04-14 09:29:54 +03:00

README 

The PostgreSQL contrib tree
---------------------------

This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly
because they address a limited audience or are too experimental to be
part of the main source tree.  This does not preclude their
usefulness.

User documentation for each module appears in the main SGML
documentation.

When building from the source distribution, these modules are not
built automatically, unless you build the "world" target.  You can
also build and install them all by running "gmake all" and "gmake
install" in this directory; or to build and install just one selected
module, do the same in that module's subdirectory.

Some directories supply new user-defined functions, operators, or
types.  To make use of one of these modules, after you have installed
the code you need to register the new SQL objects in the database
system by executing a CREATE EXTENSION command.  In a fresh database,
you can simply do

    CREATE EXTENSION module_name;

See the PostgreSQL documentation for more information about this
procedure.