be smarter, only write a new MAKEDEV if more than just the rcsid changed

src/etc/Makefile.inc

@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.inc,v 1.1 2008/06/14 23:09:05 todd Exp $
+#	$OpenBSD: Makefile.inc,v 1.2 2008/06/15 01:51:55 todd Exp $
 
 MAKEDEVSRC=	${.CURDIR}/../MAKEDEV.mi
 MAKEDEVSRC+=	${.CURDIR}/../MAKEDEV.sub
@@ -6,8 +6,23 @@ MAKEDEVSRC+=	${.CURDIR}/../MAKEDEV.common
 MAKEDEVSRC+=	MAKEDEV.md
 
 MAKEDEV: ${MAKEDEVSRC}
-	@echo m4 -I.. ../MAKEDEV.mi '>' MAKEDEV
-	@m4 -I${.CURDIR}/.. \
-		${.CURDIR}/../MAKEDEV.mi > .MAKEDEV.tmp && \
-		mv .MAKEDEV.tmp MAKEDEV || \
-		rm .MAKEDEV.tmp
+	@if m4 -I${.CURDIR}/.. -I${.CURDIR} \
+	    ${.CURDIR}/../MAKEDEV.mi > MAKEDEV.tmp; then \
+	    if ! [ -f ${.CURDIR}/MAKEDEV ]; then \
+		echo "    m4 -I.. -I. ../MAKEDEV.mi > MAKEDEV"; \
+		cp MAKEDEV.tmp ${.CURDIR}/MAKEDEV; \
+		rm MAKEDEV.tmp; \
+		exit 0; \
+	    fi; \
+	    diff MAKEDEV.tmp ${.CURDIR}/MAKEDEV > diffout1 || true; \
+	    sed -e 's/^--.*$$//' \
+		-e 's/^[\<\>] #.*OpenBSD.*Exp $$//' \
+		-e 's/^[0-9]*c[0-9]*$$//' \
+		-e '/^$$/d' \
+		diffout1 > diffout2; \
+	    if [ -s diffout2 ]; then \
+		echo "    m4 -I.. -I. ../MAKEDEV.mi > MAKEDEV"; \
+	    	cp MAKEDEV.tmp ${.CURDIR}/MAKEDEV || true; \
+	    fi; \
+	    rm diffout1 diffout2; \
+	fi

src/etc/etc.alpha/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:05 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:55 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.amd64/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:05 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:55 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.armish/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:05 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:55 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.aviion/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:05 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.hp300/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:05 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.hppa/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:05 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.hppa64/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.i386/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.landisk/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.luna88k/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.mac68k/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.macppc/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.mvme68k/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.mvme88k/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.sgi/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.socppc/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.sparc/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.sparc64/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.vax/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV
 

src/etc/etc.zaurus/Makefile

@@ -1,6 +1,4 @@
-#	$OpenBSD: Makefile,v 1.1 2008/06/14 23:09:06 todd Exp $
-
-NOOBJ=
+#	$OpenBSD: Makefile,v 1.2 2008/06/15 01:51:56 todd Exp $
 
 all: MAKEDEV