Re: getting a locally built library

[Bruce Korb]

David Bacher wrote:
> 
> Hi Bruce,
> 
> I'm having a problem building the latest autogen 5.4.6 on Mac OS X,
> while the old autogen is installed.
> 
> When linking the new autogen executable, it finds the old (installed)
> verison of libopts instead of the new (local) libopts library. This
> causes problems because new symbols are defined in the new library,
> which the new autogen requires:
> 
> /bin/sh ../libtool --mode=link gcc  -g -O2  -L/sw/lib -o autogen \
>   -export-dynamic -lguile *.o  -L/sw/lib -lguile -lm \
>   -L../autoopts/.libs -lopts -ldl
> ld: Undefined symbols:
> _aopts_alloc
> _aopts_realloc
> _aopts_strdup
> make[1]: *** [autogen] Error 1
> 
> The easiest workaround would be to remove the old version before
> compiling the new one; however, since I am producing 5.4.6 as a fink
> package, I don't have the option to remove the existing package

The right answer, of course, is to have ``-L../autoopts/.libs''
wind up appearing before ``-L/sw/lib''.  That means, I think, I
need to switch the contents of LDADD and LDFLAGS and my guess is
that something you've done has caused the first appearance of
``-L/sw/lib''.  Don't know what that may be though.

> [...]
> Is there a way to solve the multiple library problem during the build
> process, perhaps by linking to a specific library version?

This is a libtool or automake question.
The relevant module options are:

  autogen_LDADD   = $(top_builddir)/autoopts/libopts.la
  autogen_LDFLAGS = $(DYNAMIC_AG) $(GUILE_LDFLAGS)

And configure.in says:

    AC_CHECK_FUNCS(dlopen)
    if test $ac_cv_func_dlopen = yes
    then DYNAMIC_AG=-export-dynamic
    else DYNAMIC_AG=""
    fi
    AC_SUBST(DYNAMIC_AG)

And configure itself also says (slightly edited):

    CPPFLAGS="${ag_save_CPPFLAGS}"
    LDFLAGS="${ag_save_LDFLAGS}"
    f=`guile-config link`
    if test -z "$f"
    then
      echo "$as_me:$LINENO: error: Cannot find Guile" >&5
      exit 1
    fi
    GUILE_LDFLAGS="$f"
    GUILE_CPPFLAGS=`guile-config compile | \
        sed 's,-I */usr/include\( |$\),,'`
    echo "libguile found via guile-config" >&2
    ag_cv_with_guile_libdir="${GUILE_LDFLAGS}"
    ag_cv_with_guile_incdir="${GUILE_CPPFLAGS}"