- added code to install an 'ar' script which appends the U flag to the first

argument. the semantics for ar were changed to zero out the timestamp of
  each module. nmake relies on the timestamp to tell if the module has changed

- added modified 'cc' scripts for linux to add the -P flag. modern gcc's put
  # lines that confuse nmake

- changed make.probe script to drop -nostartfiles for gcc >= 7.0

src/cmd/INIT/make.probe

@@ -40,6 +40,12 @@ probe_no_protect="'-fno-stack-protector -fno-stack-protector-all' -GS-"
 probe_readonly="-R -Krodata -xMerge -Wa,-r"
 probe_shared="'' -G -b -c -shared -Wl,dll"
 probe_shared_name="-Wl,-soname= -h"
+probe_shared_nostart="-nostartfiles"
+case `gcc -v 2>&1 | egrep gcc.version` in
+*version' '7*) probe_shared_nostart= ;;
+*version' '8*) probe_shared_nostart= ;;
+*version' '9*) probe_shared_nostart= ;;
+esac
 probe_shared_registry='"-update_registry $probe_shared_registry_file"'
 probe_shared_registry_file='registry.ld'
 probe_shared_registry_path="\$(LIBDIR)/$probe_shared_registry_file"
@@ -708,6 +714,37 @@ case $cc_dll:$cc_pic:$so:$dynamic:$static in
 		esac
 		dld=$xx
 		shared=$1
+		# does -nostartfiles make sense for C?
+		case $plusplus in
+		'')	z=`wc -c < xxx$dll`
+			eval set x $probe_shared_nostart
+			while	:
+			do	shift
+				case $# in
+				0)	break ;;
+				esac
+				rm -f xxx$dll
+				if	$dld $shared $1 -o xxx$dll shared.$obj 2>e && test -r xxx$dll
+				then	case `wc -c < xxx$dll` in
+					$z)	;;
+					*)	if	test -s e
+						then	case `cat e` in
+							*[Ee][Rr][Rr][Oo][Rr]*|*[Ww][Aa][Rr][Nn][Ii][Nn][Gg]*|*[Oo][Pp][Tt][Ii][Oo][Nn]*)
+								continue
+								;;
+							esac
+						fi
+						case $shared in
+						'')	shared=$1 ;;
+						*)	shared="$shared $1" ;;
+						esac
+						break
+						;;
+					esac
+				fi
+			done
+			;;
+		esac
 		case $cc_dll in
 		"")	cc_dll=$cc_dll_def ;;
 		esac

src/cmd/INIT/package.sh

@@ -5601,6 +5601,18 @@ make|view)
 			;;
 		esac
 	done
+	c=ar
+	b=$INSTALLROOT/bin/$c
+	for t in $h
+	do	s=$INITROOT/$c.$t
+		test -x "$s" || continue
+		case `ls -t "$b" "$s" 2>/dev/null` in
+		$b*)	;;
+		$s*)	$exec cp "$s" "$b"
+			note update $b
+			;;
+		esac
+	done
 # following code stubbed out just in case ar.ibm.risc is needed
 #	c=ar
 #	b=$INSTALLROOT/bin/$c