Re: Libtool doesn't set -rpath automatically when needed?

[Benoit SIGOURE]

On Nov 3, 2007, at 9:53 AM, Ralf Wildenhues wrote:

> Hello Benoit,
>
> * Benoit SIGOURE wrote on Fri, Nov 02, 2007 at 10:34:13PM CET:
> > On GNU/Linux Debian with GCC 4.1 / Debian's libtool 1.5.22-4
> > (1.1220.2.365 2005/12/18 22:14:06), I have Boost installed under / 
> > usr/
> > local/lib (pre-built binaries: http://www.tsunanet.net/~tsuna/
> > boost_1_34_1-i486-linux-gcc41.tar.gz) and when I link with `-
> > lboost_thread-gcc41-mt-1_34_1 -pthread' I can't run the executable
> > without manually setting LD_LIBRARY_PATH.  Shouldn't libtool do
> > something about this?  I know that Boost doesn't come with .la files
> [...]
>
> Libtool doesn't add run paths to installed libraries without .la  
> files.
> (How should it know that it should not only add /usr/local/lib, but  
> also
> /opt/foo/lib because that is needed as well?  OK, this question is  
> moot
> on GNU/Linux, but not on other systems.)
>
> You can use -R/usr/local/lib to make libtool add one.

I don't want libtool to add run paths to already installed libraries  
(this is obviously impossible, simply because it would require root  
privileges to change /usr/local/lib/libboost_*), I'd like libtool to  
add a run path to my own library/program so that I can run them  
without having to deal with LD_LIBRARY_PATH issues.

> > Moreover, I don't see how to do such a check
> > while preserving cross-compilation capabilities (since checking
> > whether -rpath works or not requires to run the binary somehow,
> > doesn't it?
>
> You don't need to, AC_PROG_LIBTOOL does that for you.

OK great so maybe I can copy/paste the part of AC_PROG_LIBTOOL that  
does this in my own macro so I can portably figure out the -rpath/-R/ 
etc. options needed and then add them to BOOST_THREADS_LDFLAGS,  
right?  I don't think it'd be a good idea to add AC_REQUIRE 
([AC_PROG_LIBTOOL]) to my BOOST_THREADS macros...
How does that sound?

--
Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory

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