pgxs question - linking c-functions to external libraries

johnduffy@f2s.com writes:

My functions compile fine using PGXS, but don't link against the GSL libraries.
How do I specify the GSL libraries as external libraries to link against in the
PGXS Makfile? I have tried the following which don't work:

PG_CPPFLAGS = -lgsl -lgslcblas
PG_LIBS = -lgsl -gslcblas
SHLIB_LINK = -lgsl -gslcblas

My PGXS makefile is:

MODULES pg_gsl
PGXS := $(shell $(PG_CONFIG) --pgxs)
include $(PGXS)

SHLIB_LINK is the right thing for MODULES. Maybe you forgot a -L
switch?

regards, tom lane

Tom

Thanks for the reply. My GSL libraries, 'libgsl' and 'libgslcblas', are in the
/usr/lib directory as GSL and the GSL development files were installed via
Fedora 8 RPM's. I'm a relative newbie to programming, so I thought the -L
switch is only required to add a non-standard library location to the
directories searched for libraries.

I will give it a go.

Thanks

John

Quoting Tom Lane <tgl@sss.pgh.pa.us>:

On Mon, May 19, 2008 at 06:23:03PM +0100, johnduffy@f2s.com wrote:

Thanks for the reply. My GSL libraries, 'libgsl' and 'libgslcblas', are in the

I saw that and then in your previous message:

PG_CPPFLAGS = -lgsl -lgslcblas
PG_LIBS = -lgsl -gslcblas
SHLIB_LINK = -lgsl -gslcblas

Shouldn't those -gslcblas be -lgslcblas?

Have a ncie day,
--
Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/

A typo on my part in my posting. My Makefile has:

SHLIB_LINK = -lgsl -lgslcblas

Regards

John

Quoting Martijn van Oosterhout <kleptog@svana.org>:

Hi John,
have you managed to get it to link with external shared libs?
tia,
Rad

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On 6/6/13 11:49 PM, Rad Cirskis wrote:

Hi John,
have you managed to get it to link with external shared libs?

Sure, many extensions to that. Do something like

SHLIB_LINK += -lfoo

in your Makefile.

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I recently had need to do the same thing and I am having no luck. Admittedly, I am not too keen on the postgres build setup and have not debugged this extensively, but rather hoped there was an easy answer up front. That said….

I am trying to link libuuid into a custom extension, here is my make file (building PG 9.3.5 on CentOS 6.5 (GCC 4.4.7) fwiw):

MODULES = aitpowerpg
EXTENSION = aitpowerpg
DATA = aitpowerpg--1.0.sql

SHLIB_LINK += -luuid

ifdef USE_PGXS
PG_CONFIG = pg_config
PGXS := $(shell $(PG_CONFIG) --pgxs)
include $(PGXS)
else
subdir = contrib/aitpowerpg
top_builddir = ../..
include $(top_builddir)/src/Makefile.global
include $(top_srcdir)/contrib/contrib-global.mk
endif

The line SHLIB_LINK += -luuid has no effect. All of postgres builds & runs ok, this custom module builds fine but won’t load due to missing symbols which makes sense since ldd shows that libuuid is not linked in.

If I make clean, make, then just execute the last gcc invocation to link the extension then manually tack -luuid at the end, all is good.

Is there something simple I’m missing?

thanks
alan

Alan Nilsson <anilsson@apple.com> writes:

I am trying to link libuuid into a custom extension, here is my make file (building PG 9.3.5 on CentOS 6.5 (GCC 4.4.7) fwiw):

MODULES = aitpowerpg
EXTENSION = aitpowerpg
DATA = aitpowerpg--1.0.sql

SHLIB_LINK += -luuid

ifdef USE_PGXS
PG_CONFIG = pg_config
PGXS := $(shell $(PG_CONFIG) --pgxs)
include $(PGXS)
else
subdir = contrib/aitpowerpg
top_builddir = ../..
include $(top_builddir)/src/Makefile.global
include $(top_srcdir)/contrib/contrib-global.mk
endif

The line SHLIB_LINK += -luuid has no effect.

I'm not sure how well documented this is, but pgxs.mk quoth

# SHLIB_LINK -- will be added to MODULE_big link line

Since you're using the MODULES target not the MODULE_big target, it gets
left out. Try following the pattern in the contrib/uuid-ossp Makefile.

regards, tom lane

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Awesome - thanks Tom, works.

alan

On Dec 12, 2014, at 1:06 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:

Alan Nilsson <anilsson@apple.com> writes:

I am trying to link libuuid into a custom extension, here is my make file (building PG 9.3.5 on CentOS 6.5 (GCC 4.4.7) fwiw):

MODULES = aitpowerpg
EXTENSION = aitpowerpg
DATA = aitpowerpg--1.0.sql

SHLIB_LINK += -luuid

ifdef USE_PGXS
PG_CONFIG = pg_config
PGXS := $(shell $(PG_CONFIG) --pgxs)
include $(PGXS)
else
subdir = contrib/aitpowerpg
top_builddir = ../..
include $(top_builddir)/src/Makefile.global
include $(top_srcdir)/contrib/contrib-global.mk
endif

The line SHLIB_LINK += -luuid has no effect.

I'm not sure how well documented this is, but pgxs.mk quoth

# SHLIB_LINK -- will be added to MODULE_big link line

Since you're using the MODULES target not the MODULE_big target, it gets
left out. Try following the pattern in the contrib/uuid-ossp Makefile.

regards, tom lane

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