OpenBSD: use RPATH instead of absolute NEEDED names

[Ralf Wildenhues]

On OpenBSD, this:
  gcc -o prog /path/to/libfoo.so prog.o

hardcodes `/path/to/libfoo.so' into DT_NEEDED of `prog'; it breaks
the second DESTDIR test of CVS Libtool; and it means we should set
hardcode_direct_absolute to yes, so -Wl,-rpath is instead used for
installed libraries.  Finally fixes the issue discussed in [1].

With this, the HEAD testsuite passes completely on OpenBSD 3.9,
except for the issue discussed in [2], which I intend to fix by
rewriting the test.

OK to install?

Cheers, and apologies for the huge delay,
Ralf

[1] http://lists.gnu.org/archive/html/libtool/2006-01/msg00090.html
[2] http://lists.gnu.org/archive/html/libtool/2005-12/msg00075.html


        * libltdl/m4/libtool.m4 (_LT_LINKER_SHLIBS, _LT_LANG_CXX_CONFIG)
        [ openbsd ]: Set `hardcode_direct_absolute', to prefer rpath
        over putting absolute file names in NEEDED entries.
        * NEWS: Update.
        Reported by Jake Meuser and others.

Index: NEWS
===================================================================
RCS file: /cvsroot/libtool/libtool/NEWS,v
retrieving revision 1.195
diff -u -r1.195 NEWS
--- NEWS        25 Aug 2006 15:04:30 -0000      1.195
+++ NEWS        12 Sep 2006 19:20:18 -0000
@@ -67,6 +67,8 @@
 * Improved support for linux-gnu/ia64.
 * Initial support for s390x-ibm-tpf.
 * Fixed some memory leaks in libltdl.
+* Improved support for OpenBSD (use rpath instead of hardcoding absolute
+  file names).
 
 New in 1.9b: 2004-08-29; CVS version 1.5a, Libtool team:
 * The /^_?LT_[A-Z_]+$/ namespace is now reserved for Libtool's own macros.
Index: libltdl/m4/libtool.m4
===================================================================
RCS file: /cvsroot/libtool/libtool/libltdl/m4/libtool.m4,v
retrieving revision 1.82
diff -u -r1.82 libtool.m4
--- libltdl/m4/libtool.m4       25 Aug 2006 15:04:30 -0000      1.82
+++ libltdl/m4/libtool.m4       12 Sep 2006 19:20:21 -0000
@@ -4658,7 +4658,8 @@
 
     openbsd*)
       _LT_TAGVAR(hardcode_direct, $1)=yes
       _LT_TAGVAR(hardcode_shlibpath_var, $1)=no
+      _LT_TAGVAR(hardcode_direct_absolute, $1)=yes
       if test -z "`echo __ELF__ | $CC -E - | $GREP __ELF__`" || test 
"$host_os-$host_cpu" = "openbsd2.8-powerpc"; then
        _LT_TAGVAR(archive_cmds, $1)='$CC -shared $pic_flag -o $lib $libobjs 
$deplibs $compiler_flags'
        _LT_TAGVAR(archive_expsym_cmds, $1)='$CC -shared $pic_flag -o $lib 
$libobjs $deplibs $compiler_flags ${wl}-retain-symbols-file,$export_symbols'
@@ -5864,7 +5865,8 @@
 
       openbsd*)
        _LT_TAGVAR(hardcode_direct, $1)=yes
        _LT_TAGVAR(hardcode_shlibpath_var, $1)=no
+       _LT_TAGVAR(hardcode_direct_absolute, $1)=yes
        _LT_TAGVAR(archive_cmds, $1)='$CC -shared $pic_flag $predep_objects 
$libobjs $deplibs $postdep_objects $compiler_flags -o $lib'
        _LT_TAGVAR(hardcode_libdir_flag_spec, $1)='${wl}-rpath,$libdir'
        if test -z "`echo __ELF__ | $CC -E - | grep __ELF__`" || test 
"$host_os-$host_cpu" = "openbsd2.8-powerpc"; then