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Re: How can I link with libguile?

From: Bruce Korb
Subject: Re: How can I link with libguile?
Date: Mon, 13 Jan 2003 10:16:04 -0800

Albert Chin wrote:
> On Sun, Jan 12, 2003 at 04:24:02PM -0800, Bruce Korb wrote
in :
> > ``libguile'' lives in a place where LD_LIBRARY_PATH must be set
> > (viz., /opt/sfw/lib).   What is wrong?  What should I be doing to
> > tell libtool that it has to add a ``-R/opt/sfw/lib'' or something?
> > If I use ``guile-config'' first, I'll override ``--with-libguile''.
> > So much pain.  :-(
> We solve this by building like so:
>   $ LDFLAGS="-R[path to guile library]" ./configure
> And, in the specific case of guile, we modify guile-config to output
> -L[path to guile libraries] *and* -R[path to guile libraries].


Several problems:

1.  There seems to be something funny about the way links work on
    the Source Forge compile farm.  The linker (invoked as "gcc")
    knows where to find free software libraries ("/opt/fsw/lib"),
    but it doesn't pass this knowledge along to the run time loader.
    Is this expected behavior, or a Source Forge issue?  Should my
    link test be changed to a run test?  Doing that would trigger
    the invocation of "guile-config".  In any event, on the compile
    farm, my test believes that it can compile and link without
    anything more special than ``-lguile'' on the link line (no "-I"

2.  On Solaris, libtool ought to take "-L" args and duplicate them
    as "-R" args, yes?  Or, is that too simple?

3.  As the author of a *-config script, how would I know when to
    add the "-R" thingey?  Would libtool strip it if it weren't
    needed on a particular platform?  Do you (Albert) add the
    -R/path/to/libopts on my script, too?  Is there a configure
    test to check for the need of adding "-R"?

4.  Your solutions work well for your environment:  you are in control
    of the production of your binaries.  My problem is that I am trying
    (with amazing amounts of frustration ;) to produce scripts that
    allow my clients to build and install products with:

    ( gunzip -c product*.tar.gz | tar -xvf - ) && \
    cd product* && \
    ./configure && \
    make && \
    make install

    without having to know or understand the configury of Guile and
    the magical linker options for any particular platform.  In theory,
    that is what autoconf/automake/libtool are all about.  :(

P.S.:  Dan Kegel asked:
> Is guile-config reliably installed for versions of guile
> later than some number X?

Answer:  No.  It is a special issue with Red Hat.  They set the
prefix to "/usr" so that no special configury is required, so
nobody needs to consult "guile-config".  That means that just
because you cannot find "guile-config" it doesn't mean that
Guile has not been installed.  SO:  step 1, let someone tell you
where to find it.  Failing that, step 2, try to use it anyway.
If *that* fails, then, finally, go find "guile-config".  Maybe
I should switch steps 2 and 3, but it led to such a complicated
shell script/autoconf macro....Red Hat should distribute the script.

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