Re: LD_LIBRARY_PATH problems

[Paul Kienzle]

--disable-rpath doesn't work when you install octave since octave libs aren't
in the standard place.  

Here's the script I use for running a test version of an already installed
version of octave compiled with --rpath:

#! /bin/sh

BASE=/home/pkienzle/cvs/octave
OCTAVE=$BASE/src/octave
ARGS="--norc --path .:$BASE/scripts//:$BASE/src"
LIBPATH=$BASE/libcruft:$BASE/liboctave:$BASE/src

# LD_LIBRARY_PATH works fine in the installed version is different from 
# the test version.  If it is the same, the --rpath will pick up the 
# installed libraries without even checking the LD_LIBRARY_PATH.

#LD_LIBRARY_PATH=$LIBPATH ldd $OCTAVE
#LD_LIBRARY_PATH=$LIBPATH $OCTAVE $ARGS
#exit 

# Since LD_LIBRARY_PATH doesn't work we will preload explicitly named libraries
CRUFT=$BASE/libcruft/libcruft.so
LIBOCTAVE=$BASE/liboctave/liboctave.so
PATHSEARCH=$BASE/liboctave/liboct-pathsearch.so
READLINE=$BASE/liboctave/liboct-readline.so
INTERP=$BASE/src/liboctinterp.so

# Can't preload $PATHSEARCH because it requires symbols from src/octave
# Instead set LD_LIBRARY_PATH so we can pick it up from testoct.  
# The LD_LIBRARY_PATH is ignored for cvs.
PRELOAD=$CRUFT:$LIBOCTAVE:$INTERP:$READLINE
export LD_LIBRARY_PATH=$BASE/liboctave

LD_PRELOAD=$PRELOAD ldd $OCTAVE
LD_PRELOAD=$PRELOAD $OCTAVE $ARGS

Paul Kienzle
address@hidden

On Wed, Aug 14, 2002 at 01:34:44PM -0400, Paul Kienzle wrote:
> Hi,
> 
> I've been trying to track down a problem in input.cc which comes about when I
> have a really long input line:
> 
>       input.cc:307: int octave_read (char *, unsigned int): Assertion `len > 
> 0' failed.
>       panic: Aborted -- stopping myself...
> 
> In the process of fixing it, I needed to override liboctinterp.so, so taking
> some lines from test/Makefile I did the following:
> 
>       #! /bin/sh
> 
>       BASE=/home/pkienzle/cvs/octave
>       OCTAVE=$BASE/src/octave
>       ARGS="--norc --path .:$BASE/scripts//:$BASE/src"
>       LIBPATH=$BASE/libcruft:$BASE/liboctave:$BASE/src
>       LD_LIBRARY_PATH=$LIBPATH ldd $OCTAVE
>       LD_LIBRARY_PATH=$LIBPATH $OCTAVE $ARGS
> 
> This didn't work.  The "ldd" command shows that it is still picking up
> files from /usr/local/lib.  
> 
> A warning to other maintainers: before running make check, you should 
> first run the above script and check that you are picking up the correct
> libraries.
> 
> Looking at the ld.so man page, it seems to check for libraries in the
> following order
> 
>       RPATH section of object
>       LD_LIBRARY_PATH environment variable
>       RUNPATH section of object
>       /etc/ld.so.cache
> 
> Looking at my Makeconf, I see that RLD_FLAG contains -Xlinker -rpath, so ld
> is doing what it claims.  Presumably the --disable-rpath option on ./configure
> will make things work right, but I haven't checked (it takes a looong time to
> compile on this box).
> 
> So my question is, is there any way to override the builtin rpath?
> 
> Using LD_PRELOAD I can explicitly load the libraries but this runs into 
> another 
> problem: liboct-pathsearch depends on symbols from libkpathsea.a which for
> some reason is linked into src/octave directly.  I haven't tried linking it 
> into liboct-pathsearch (again, it takes a long time to compile), but that 
> might
> fix it.
> 
> Paul Kienzle
> address@hidden
>