postgresql/contrib/spi
Tom Lane dddfc4cb2e Prevent accidental linking of system-supplied copies of libpq.so etc.
We were being careless in some places about the order of -L switches in
link command lines, such that -L switches referring to external directories
could come before those referring to directories within the build tree.
This made it possible to accidentally link a system-supplied library, for
example /usr/lib/libpq.so, in place of the one built in the build tree.
Hilarity ensued, the more so the older the system-supplied library is.

To fix, break LDFLAGS into two parts, a sub-variable LDFLAGS_INTERNAL
and the main LDFLAGS variable, both of which are "recursively expanded"
so that they can be incrementally adjusted by different makefiles.
Establish a policy that -L switches for directories in the build tree
must always be added to LDFLAGS_INTERNAL, while -L switches for external
directories must always be added to LDFLAGS.  This is sufficient to
ensure a safe search order.  For simplicity, we typically also put -l
switches for the respective libraries into those same variables.
(Traditional make usage would have us put -l switches into LIBS, but
cleaning that up is a project for another day, as there's no clear
need for it.)

This turns out to also require separating SHLIB_LINK into two variables,
SHLIB_LINK and SHLIB_LINK_INTERNAL, with a similar rule about which
switches go into which variable.  And likewise for PG_LIBS.

Although this change might appear to affect external users of pgxs.mk,
I think it doesn't; they shouldn't have any need to touch the _INTERNAL
variables.

In passing, tweak src/common/Makefile so that the value of CPPFLAGS
recorded in pg_config lacks "-DFRONTEND" and the recorded value of
LDFLAGS lacks "-L../../../src/common".  Both of those things are
mistakes, apparently introduced during prior code rearrangements,
as old versions of pg_config don't print them.  In general we don't
want anything that's specific to the src/common subdirectory to
appear in those outputs.

This is certainly a bug fix, but in view of the lack of field
complaints, I'm unsure whether it's worth the risk of back-patching.
In any case it seems wise to see what the buildfarm makes of it first.

Discussion: https://postgr.es/m/25214.1522604295@sss.pgh.pa.us
2018-04-03 16:26:05 -04:00
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autoinc--1.0.sql Throw a useful error message if an extension script file is fed to psql. 2011-10-12 15:45:03 -04:00
autoinc--unpackaged--1.0.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
autoinc.c Use wrappers of PG_DETOAST_DATUM_PACKED() more. 2017-03-12 19:35:34 -04:00
autoinc.control Convert contrib modules to use the extension facility. 2011-02-13 22:54:49 -05:00
autoinc.example Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
insert_username--1.0.sql Throw a useful error message if an extension script file is fed to psql. 2011-10-12 15:45:03 -04:00
insert_username--unpackaged--1.0.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
insert_username.c Replace uses of SPI_modifytuple that intend to allocate in current context. 2016-11-08 15:36:44 -05:00
insert_username.control Convert contrib modules to use the extension facility. 2011-02-13 22:54:49 -05:00
insert_username.example Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
Makefile Prevent accidental linking of system-supplied copies of libpq.so etc. 2018-04-03 16:26:05 -04:00
moddatetime--1.0.sql Throw a useful error message if an extension script file is fed to psql. 2011-10-12 15:45:03 -04:00
moddatetime--unpackaged--1.0.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
moddatetime.c Generate fmgr prototypes automatically 2017-01-17 14:06:07 -05:00
moddatetime.control Convert contrib modules to use the extension facility. 2011-02-13 22:54:49 -05:00
moddatetime.example Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
refint--1.0.sql Throw a useful error message if an extension script file is fed to psql. 2011-10-12 15:45:03 -04:00
refint--unpackaged--1.0.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
refint.c Remove dead assignment 2018-01-29 20:41:36 -05:00
refint.control Convert contrib modules to use the extension facility. 2011-02-13 22:54:49 -05:00
refint.example Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
timetravel--1.0.sql Throw a useful error message if an extension script file is fed to psql. 2011-10-12 15:45:03 -04:00
timetravel--unpackaged--1.0.sql Fix typos in some error messages thrown by extension scripts when fed to psql. 2014-08-25 18:30:37 +02:00
timetravel.c Document and use SPI_result_code_string() 2017-10-04 22:14:21 -04:00
timetravel.control Convert contrib modules to use the extension facility. 2011-02-13 22:54:49 -05:00
timetravel.example Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00