Consolidate lib.so.*.a, ld.so.a and the kernel relink kit into

one location under /usr/share/relink.
Be more specific in src/etc/rc reorder_libs() what filesystems
need r/w remount and ensure that their mount state is restored.
Idea and positive feedback from deraadt@
OK aja@ tb@

src/etc/Makefile

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile,v 1.460 2017/06/22 16:02:42 deraadt Exp $
+#	$OpenBSD: Makefile,v 1.461 2017/11/05 10:29:24 rpe Exp $
 
 .include <bsd.own.mk>
 
@@ -30,11 +30,11 @@ kernels: ${ALL_KERNELS}
 	chmod a+r ${RELEASEDIR}/$K
 .endfor
 	cd ${.CURDIR}/../sys/arch/${MACHINE}/compile/ && \
-		tar -chzf ${DESTDIR}/usr/share/compile.tgz -s ',/obj/,/,' \
+		tar -chzf ${DESTDIR}/usr/share/relink/kernel.tgz -s ',/obj/,/,' \
 		GENERIC*/obj/*.o GENERIC*/obj/Makefile \
 		GENERIC*/obj/ld.script GENERIC*/obj/makegap.sh
-	chown root:wheel ${DESTDIR}/usr/share/compile.tgz
-	chmod 644 ${DESTDIR}/usr/share/compile.tgz
+	chown root:wheel ${DESTDIR}/usr/share/relink/kernel.tgz
+	chmod 644 ${DESTDIR}/usr/share/relink/kernel.tgz
 
 # -rw-r--r--
 BINOWN= root
@@ -272,7 +272,7 @@ do-release:
 release-sets:
 	su ${BUILDUSER} -c 'exec ${MAKE} distribution'
 	su ${BUILDUSER} -c 'exec ${MAKE} kernels'
-	cp -p ${DESTDIR}/usr/share/compile.tgz /usr/share/compile.tgz
+	cp -p ${DESTDIR}/usr/share/relink/kernel.tgz /usr/share/relink/kernel.tgz
 	${MAKE} bootblocks
 	cd ${RELEASEDIR} && rm -f SHA256
 	cd ../distrib/sets && exec su ${BUILDUSER} -c 'exec sh maketars ${OSrev}'

src/etc/mtree/4.4BSD.dist

@@ -1,4 +1,4 @@
-#	$OpenBSD: 4.4BSD.dist,v 1.300 2017/10/08 15:14:17 visa Exp $
+#	$OpenBSD: 4.4BSD.dist,v 1.301 2017/11/05 10:29:24 rpe Exp $
 
 /set type=dir uname=root gname=wheel mode=0755
 
@@ -414,10 +414,6 @@ usr
         calendar
         ..
 
-        # ./usr/share/compile
-        compile
-        ..
-
         # ./usr/share/dict
         dict
             papers
@@ -565,6 +561,14 @@ usr
         ..
         mk
         ..
+
+        # ./usr/share/relink
+        relink
+
+            # ./usr/share/relink/kernel
+            kernel
+            ..
+        ..
         snmp
             mibs
             ..

src/etc/rc

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc,v 1.520 2017/10/25 10:42:51 bluhm Exp $
+#	$OpenBSD: rc,v 1.521 2017/11/05 10:29:24 rpe Exp $
 
 # System startup script run by init on autoboot or after single-user.
 # Output and error are redirected to console by init, and the console is the
@@ -162,40 +162,46 @@ make_keys() {
 
 # Re-link libraries, placing the objects in a random order.
 reorder_libs() {
-	local _dkdev _liba _libas _mp _tmpdir _remount=false _error=false
+	local _error=false _dkdev _liba _libas _mp _ro_list _tmpdir
 
 	[[ $library_aslr == NO ]] && return
 
-	# Skip if /usr/lib is on a nfs mounted filesystem.
-	_dkdev=$(df /usr/lib | sed '1d;s/ .*//')
-	_mp=$(mount | grep "^$_dkdev")
-	[[ $_mp == *' type nfs '* ]] && return
+	# Skip if /usr/lib, /usr/libexec or /usr/share/relink are on nfs mounted
+	# filesystems, otherwise record which ones are mounted read-only.
+	for _d in /usr/{lib,libexec,share/relink}; do
+		_dkdev=$(df $_d | sed '1d;s/ .*//')
+		_mp=$(mount | grep "^$_dkdev")
+		[[ $_mp == *" type nfs "* ]] && return
+		if [[ $_mp == *" type ffs "*"read-only"* &&
+			$_ro_list != *${_mp%% *}* ]]; then
+				_ro_list="$_ro_list ${_mp%% *}"
+		fi
+	done
 
 	echo -n 'reordering libraries:'
-
-	# Remount read-write, if /usr/lib is on a read-only ffs filesystem.
-	if [[ $_mp == *' type ffs '*'read-only'* ]]; then
-		if mount -u -w $_dkdev; then
-			_remount=true
-		else
+	
+	# Remount the (read-only) filessystems in _ro_list as read-write.
+	for _mp in $_ro_list; do
+		if ! mount -u -w $_mp; then
 			echo ' failed.'
 			return
 		fi
-	fi
+	done
 
 	# Only choose the latest version of the libraries.
-	for _liba in /usr/lib/lib{c,crypto}; do
+	for _liba in /usr/share/relink/usr/lib/lib{c,crypto}; do
 		_libas="$_libas $(ls $_liba.so.+([0-9.]).a | sort -rV | head -1)"
 	done
-	_libas=${_libas# }
 
-	for _liba in /usr/libdata/ld.so.a $_libas; do
-		_tmpdir=$(mktemp -dq /usr/lib/_rebuild.XXXXXXXXXXXX) &&
+	for _liba in /usr/share/relink/usr/libexec/ld.so.a $_libas; do
+		_tmpdir=$(mktemp -dq /usr/share/relink/_rebuild.XXXXXXXXXXXX) &&
 		(
 		set -o errexit
 		_install='install -F -S -o root -g bin -m 0444'
 		_lib=${_liba##*/}
 		_lib=${_lib%.a}
+		_lib_dir=${_liba#/usr/share/relink}
+		_lib_dir=${_lib_dir%/*} 
 		cd $_tmpdir
 		ar x $_liba
 		if [[ $_lib == ld.so ]]; then
@@ -205,24 +211,24 @@ reorder_libs() {
 			chmod u+x test-ld.so
 			[[ $(./test-ld.so ok) == './test-ld.so: ok!' ]]
 			$_install /usr/libexec/ld.so /usr/libexec/ld.so.save
-			$_install ld.so.test /usr/libexec/ld.so
+			$_install ld.so.test $_lib_dir/ld.so
 		else
 			cc -shared -o $_lib $(ls *.so | sort -R) $(cat .ldadd)
 			[[ -s $_lib ]] && file $_lib | fgrep -q 'shared object'
 			LD_BIND_NOW=1 LD_LIBRARY_PATH=$_tmpdir awk 'BEGIN {exit 0}'
 			LD_BIND_NOW=1 LD_LIBRARY_PATH=$_tmpdir openssl \
 			    x509 -in /etc/ssl/cert.pem -out /dev/null
-			$_install $_lib ${_liba%/*}/$_lib
+			$_install $_lib $_lib_dir/$_lib
 		fi
 		) || { _error=true; break; }
 	done
 
-	rm -rf /usr/lib/_rebuild.*
+	rm -rf /usr/share/relink/_rebuild.*
 
 	# Restore previous mount state if it was changed.
-	if $_remount; then
-		mount -u -r $_dkdev || _error=true
-	fi
+	for _mp in $_ro_list; do
+		mount -u -r $_mp || _error=true
+	done
 
 	if $_error; then
 		echo ' failed.'