Undefined procedure on foreign library in 6.6.4

Hi,

I successfully installed 6.6.4 using your apt-add-repository
ppa:swi-prolog/stable url (not from source),  All worked perfectly first
time - I can run swipl.

But now I'm hitting issues accessing a foreign library predicate that
appears to build correctly. I've removed nearly all the code to simplify /
reproduce:

#include <SWI-Prolog.h>

static foreign_t testfo(void)
{
	PL_succeed;
}

install_t install_libtestfo()
{
  PL_register_foreign("testfo", 0, testfo, 0);
}

When I build the above from eclipse as a shared object, it compiles no
problem, creating the shared object:

-rwxr-xr-x 1 jon  jon    41531 Apr  2 15:18 libtestfo.so

Now I link to swipl:

# swipl-ld -v -shared -o libtestfo ../testfo.c
	eval `swipl --dump-runtime-variables`
		CC="gcc"
		PLBASE="/usr/lib/swi-prolog"
		PLARCH="i386"
		PLLIBS=""
		PLLIB="-lswipl"
		PLCFLAGS="-fno-strict-aliasing -pthread -fPIC -D_FORTIFY_SOURCE=2 -fPIC
-I/usr/include/ncursesw"
		PLLDFLAGS="-rdynamic -Wl,-Bsymbolic-functions -Wl,-z,relro -g -O2
-fstack-protector --param=ssp-buffer-size=4 -Wformat -Werror=format-security
-pthread"
		PLSOEXT="so"
		PLTHREADS="yes"
	gcc -c -fpic -fno-strict-aliasing -pthread -fPIC -D_FORTIFY_SOURCE=2 -fPIC
-I/usr/include/ncursesw -D_REENTRANT -D__SWI_PROLOG__
-I/usr/lib/swi-prolog/include -o ../testfo.o ../testfo.c
	gcc -o libtestfo.so -shared -rdynamic -Wl,-Bsymbolic-functions -Wl,-z,relro
-g -O2 -fstack-protector --param=ssp-buffer-size=4 -Wformat
-Werror=format-security -pthread ../testfo.o -L/usr/lib/swi-prolog/lib/i386
-lswipl
	rm ../testfo.o

.. no errors.  The new library is definitely built.. timestamp updated, and
file size has increased compared to the version above.

-rwxr-xr-x 1 root root 1237082 Apr  2 15:20 libtestfo.so

Check the symbols are in there:

root@phoenix:/home/jon/Dev/testfo/Debug# nm libtestfo.so | grep testfo
0000e4b5 T install_libtestfo
0000e4ab t testfo

.. all ok.

Now in prolog, testfo.pl containing a single line:

:- use_foreign_library(foreign('/home/jon/Dev/testfo/Debug/libtestfo.so')). 

This loads correctly, so it has found the install predicate etc..
5 ?-  
pdt_reload:pdt_reload(['/home/jon/Dev/pl/testfo.pl']).
|    % /home/jon/Dev/pl/testfo.pl compiled 0.00 sec, 5 clauses
true.

But I get undefined procedure when trying to access it:

6 ?- testfo.
ERROR: [Thread pdt_console_client_0_Default Process] toplevel: Undefined
procedure: testfo/0 (DWIM could not correct goal)

It's always tempting to make 1+1=3, but someone else hit the similar
symptoms today:

http://stackoverflow.com/questions/22811055/why-am-i-not-able-to-load-this-c-code-in-prolog-in-linux-but-i-am-able-in-os-x

I have successfully done this before lots of times on 6.2.6 compiled from
source.. but for this install I'm on a completely new machine using
packages, and wondering what I am doing wrong.. / have forgotten / how the
process is different.

Thanks,
Jon.




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