Re: problems with LD_LIBRARY_PATH and libtool wrapper

[Dan McMahill]

Ralf Wildenhues wrote:
> Hi Dan,
>
> * Dan McMahill wrote on Wed, Aug 13, 2008 at 11:06:41PM CEST:
> > I have a problem with the LD_LIBRARY_PATH handling inside of the libtool  
> > wrapper.  I see a line like:
> >
> > # Add our own library path to LD_LIBRARY_PATH
> > LD_LIBRARY_PATH="/usr/pkg/lib:/home/dan/src/myprog/libmine/.libs:$LD_LIBRARY_PATH"
> >
> > in /home/dan/src/myprog/src/myprog which is the libtool wrapper.
> >
> > The problem is I may have an out of date libmine installed in  
> > /usr/pkg/lib and at runtime I pick that one up instead of the one in  
> > /home/dan/src/myprog/libmine/.libs.  This has caused me great confusion  
> > a couple of times when I absolutely could not correlate the behavior of  
> > the program with the sources in ../libmine because of course they didn't  
> > match.
> >
> > It seems that we want to make sure any ".libs" directories appear first  
> > in LD_LIBRARY_PATH.
> >
> > Am I missing something obvious here?
>
> Could be.  Does myprog have an
>   myprog_LDADD = ../libmine/libmine.la

myprog_LDADD = @LIBMINE_LDADD@

and at configure time @LIBMINE_LDADD@ either gets set to 
../libmine/libmine.la or something like -L/usr/pkg/lib -lmine.  There is 
a configure time option that says to either use a local build of the 
library or use an already installed one.  This was done because there 
are actually about 5 different programs that all use libmine that are 
all included in the tarball.  This lets a third party packaging system 
add the individual programs more easily.  The programs are all just 
different front ends (gtk, cgi, commandline, scilab, octave, etc) to 
libmine.


One thing I have realized is I do not have any version set for libmine 
which is clearly not a good thing.

> line, and can you show the libtool link command lines for both the
> library and the program plus all of their output when executed?

Here is the link lines for the library (libwcalc)

/bin/ksh ../libtool --tag=CC   --mode=link gcc  -g -O2 -Wall     -o 
libwcalc.la
-rpath /usr/local/lib air_coil.lo air_coil_loadsave.lo bars.lo 
bars_loadsave.lo
coax.lo coax_loadsave.lo coplanar.lo coplanar_loadsave.lo 
coupled_microstrip.lo
coupled_microstrip_loadsave.lo coupled_stripline.lo 
coupled_stripline_loadsave.lo defaults.lo ic_microstrip.lo 
ic_microstrip_loadsave.lo mathutil.lo microstrip.lo 
microstrip_loadsave.lo misc.lo stripline.lo stripline_loadsave.lo 
units.lo wcalc_loadsave.lo  -lm

gcc -shared  .libs/air_coil.o .libs/air_coil_loadsave.o .libs/bars.o 
.libs/bars_loadsave.o .libs/coax.o .libs/coax_loadsave.o 
.libs/coplanar.o .libs/coplanar_loadsave.o .libs/coupled_microstrip.o 
.libs/coupled_microstrip_loadsave.o .libs/coupled_stripline.o 
.libs/coupled_stripline_loadsave.o .libs/defaults.o 
.libs/ic_microstrip.o .libs/ic_microstrip_loadsave.o .libs/mathutil.o 
.libs/microstrip.o .libs/microstrip_loadsave.o .libs/misc.o 
.libs/stripline.o .libs/stripline_loadsave.o .libs/units.o 
.libs/wcalc_loadsave.o  -lm  -Wl,-soname -Wl,libwcalc.so.0 -o
 .libs/libwcalc.so.0.0
(cd .libs && rm -f libwcalc.so.0 && ln -s libwcalc.so.0.0 libwcalc.so.0)
(cd .libs && rm -f libwcalc.so && ln -s libwcalc.so.0.0 libwcalc.so)
ar cru .libs/libwcalc.a  air_coil.o air_coil_loadsave.o bars.o 
bars_loadsave.o c
oax.o coax_loadsave.o coplanar.o coplanar_loadsave.o 
coupled_microstrip.o coupled_microstrip_loadsave.o coupled_stripline.o 
coupled_stripline_loadsave.o defaults.o ic_microstrip.o 
ic_microstrip_loadsave.o mathutil.o microstrip.o microstrip_loadsave.o 
misc.o stripline.o stripline_loadsave.o units.o wcalc_loadsave.o
ranlib .libs/libwcalc.a
creating libwcalc.la
(cd .libs && rm -f libwcalc.la && ln -s ../libwcalc.la libwcalc.la)


and here is the link for the program:

/bin/ksh ../libtool --tag=CC   --mode=link gcc  -g -O2 -Wall 
-Wl,-R/usr/pkg/lib
-Wl,--rpath -Wl,/usr/pkg/lib -Wl,-R/usr/X11R6/lib -L/usr/pkg/lib 
-L/usr/X11R6/lib -lgtk-x11-2.0 -lgdk-x11-2.0 -lXi -latk-1.0 
-lgdk_pixbuf-2.0 -lpangocairo-1.0 -lXrandr -lXext -lXcursor -lXfixes 
-lcairo -lpangoft2-1.0 -lfontconfig -lfreetype
 -lz -lpango-1.0 -lm -lXrender -lX11 -lgobject-2.0 -lgmodule-2.0 
-lglib-2.0 -lintl     -o wcalc about.o alert.o air_coil_gui.o bars_gui.o 
coax_gui.o coplanar_gui.o coupled_microstrip_gui.o 
coupled_stripline_gui.o epscat.o files.o gtk-units.o ic_microstrip_gui.o 
menus.o microstrip_gui.o print.o start.o stripline_gui.o version.o 
wcalc.o AWG.o permeability.o permitivity.o resistivity.o units.o ../lib
wcalc/libwcalc.la  -lm

mkdir .libs

gcc -g -O2 -Wall -Wl,-R/usr/pkg/lib -Wl,--rpath -Wl,/usr/pkg/lib 
-Wl,-R/usr/X11R6/lib -o .libs/wcalc about.o alert.o air_coil_gui.o 
bars_gui.o coax_gui.o coplanar_gui.o coupled_microstrip_gui.o 
coupled_stripline_gui.o epscat.o files.o gtk-units.o ic_microstrip_gui.o 
menus.o microstrip_gui.o print.o start.o stripline_gui.o version.o 
wcalc.o AWG.o permeability.o permitivity.o resistivity.o units.o
-L/usr/pkg/lib -L/usr/X11R6/lib /usr/pkg/lib/libgtk-x11-2.0.so 
/usr/pkg/lib/libgdk-x11-2.0.so -lXi /usr/pkg/lib/libatk-1.0.so 
/usr/pkg/lib/libgdk_pixbuf-2.0.so
/usr/pkg/lib/libpangocairo-1.0.so /usr/pkg/lib/libXrandr.so -lXext 
/usr/pkg/lib/
libXcursor.so /usr/pkg/lib/libXfixes.so /usr/pkg/lib/libcairo.so 
/usr/pkg/lib/libglitz.so /usr/pkg/lib/libpng12.so -lSM -lICE 
/usr/pkg/lib/libpangoft2-1.0.so /usr/pkg/lib/libfontconfig.so 
/usr/pkg/lib/libexpat.so /usr/pkg/lib/libfreetype.so
 /usr/pkg/lib/libz.so /usr/pkg/lib/libpango-1.0.so 
/usr/pkg/lib/libXrender.so -lX11 /usr/pkg/lib/libgobject-2.0.so 
/usr/pkg/lib/libgmodule-2.0.so /usr/pkg/lib/libglib-2.0.so 
/usr/pkg/lib/libintl.so -lc ../libwcalc/.libs/libwcalc.so -lm -Wl,
--rpath -Wl,/usr/pkg/lib -Wl,--rpath -Wl,/usr/local/lib




As far as running the program, I don't get any particular output that 
would be that interesting here other than I can put a printf("Hi, you 
have the right library!\n") into a function in libwcalc that I know will 
be called and I see that the code never executes.  If I edit the wcalc 
wrapper script generated by libtool and put ../libwcalc/.libs at the 
beginning (instead of the end) of LD_LIBRARY_PATH then I do see that 
printf output.  Also I can just do

ldd .libs/wcalc and see, among the other shared libs:

        -lwcalc.0 => /usr/pkg/lib/libwcalc.so.0

where that is an old version which is installed on the system.  The 
reason I just don't delete the old version is the new one is still under 
development and not ready for deployment.

Thanks
-Dan