libtool: for 64bit GNU arches, add /lib64 and /usr/lib64 to sys_lib_dlsearch_path.

* m4/libtool.m4 (_LT_SYS_DYNAMIC_LINKER) <linux*, k*bsd*-gnu>
<kopensolaris*-gnu, gnu*>: If $host_cpu contains "64", add /lib64
and /usr/lib64 to sys_lib_dlsearch_path_spec.
Reported by Orion Poplawski, Christian Rössel, Olly Betts et. al.

Signed-off-by: Gary V. Vaughan <gary@gnu.org>

diff --git a/NEWS b/NEWS
index be3c7f477733908e4e8cfe459f1815c1c8b35247..6d48d28dee714e33fd0d3d3430f0ffc109a3d644 100644 (file)
--- a/NEWS
+++ b/NEWS
@@ -24,6 +24,9 @@ NEWS - list of user-visible changes between releases of GNU Libtool
     ia64-hp-hpux*, because the default system runtime loader path does
     not contain them.
 
+  - For various GNU/Linux (and other GNU OSes) on 64bit glibc/ELF hosts,
+    explicit /lib64 and /usr/lib64 rpaths are no longer necessary.
+
 
 * Noteworthy changes in release 2.4.4 (2014-11-29) [stable]
 

diff --git a/m4/libtool.m4 b/m4/libtool.m4
index 2bbf01b1d47cb0d98d548f928df30e3fcc32d943..fd4dfb40ff18a320748ddabfbfd7d58964fb8e0a 100644 (file)
--- a/m4/libtool.m4
+++ b/m4/libtool.m4
@@ -2796,6 +2796,14 @@ linux* | k*bsd*-gnu | kopensolaris*-gnu | gnu*)
     lt_ld_extra=`awk '/^include / { system(sprintf("cd /etc; cat %s 2>/dev/null", \[$]2)); skip = 1; } { if (!skip) print \[$]0; skip = 0; }' < /etc/ld.so.conf | $SED -e 's/#.*//;/^[  ]*hwcap[        ]/d;s/[:,      ]/ /g;s/=[^=]*$//;s/=[^= ]* / /g;s/"//g;/^$/d' | tr '\n' ' '`
     sys_lib_dlsearch_path_spec="/lib /usr/lib $lt_ld_extra"
   fi
+  # Ideally we could use /sbin/ldconfig to report what directories are
+  # searched, but (aside from not being certain /sbin/ldconfig is
+  # available) Fedora on 64bit does not report /usr/lib64, even though
+  # it is searched at run-time.
+  case $host_cpu in
+    # match at least x86_64, ia64, powerpc64*
+    *64*) sys_lib_dlsearch_path_spec="/lib64 /usr/lib64 $sys_lib_dlsearch_path_spec" ;;
+  esac
 
   # We used to test for /lib/ld.so.1 and disable shared libraries on
   # powerpc, because MkLinux only supported shared libraries with the