Convert the kernel Makefiles to autogenerate dependencies during compilation

using the -MD option to cc, with -MP, -MT, and -MF where needed, converting
"make depend" to a no-op.  This increases parallelism for those using "make -j"
and keeps the dependencies up to date with each compilation automatically.

sparc and vax users will need to rebuild gcc with support for the
-M[PTF] options before config'ing with this diff.

27 files changed, 729 insertions, 513 deletions

diff --git a/sys/arch/alpha/conf/Makefile.alpha b/sys/arch/alpha/conf/Makefile.alpha
index eb485f74fb5..5e866b24cb5 100644
--- a/sys/arch/alpha/conf/Makefile.alpha
+++ b/sys/arch/alpha/conf/Makefile.alpha
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.alpha,v 1.73 2010/12/30 18:49:29 deraadt Exp $
+#	$OpenBSD: Makefile.alpha,v 1.74 2011/04/15 02:41:27 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -156,4 +152,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/amd64/conf/Makefile.amd64 b/sys/arch/amd64/conf/Makefile.amd64
index db19bf5f809..46e5299112b 100644
--- a/sys/arch/amd64/conf/Makefile.amd64
+++ b/sys/arch/amd64/conf/Makefile.amd64
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.amd64,v 1.47 2010/12/30 18:49:30 deraadt Exp $
+#	$OpenBSD: Makefile.amd64,v 1.48 2011/04/15 02:41:27 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -69,7 +69,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -89,10 +90,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -121,25 +128,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -158,4 +154,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/armish/conf/Makefile.armish b/sys/arch/armish/conf/Makefile.armish
index 7cc19a58884..9500e51b569 100644
--- a/sys/arch/armish/conf/Makefile.armish
+++ b/sys/arch/armish/conf/Makefile.armish
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.armish,v 1.38 2010/12/30 18:49:30 deraadt Exp $
+#	$OpenBSD: Makefile.armish,v 1.39 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	${_mach}_start.o locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD_HEAD+=; \
 		cat ${_archdir}/conf/ldscript.head ${_archdir}/conf/ldscript.tail | \
@@ -97,10 +98,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -129,25 +136,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/${_mach}_start.S ${_archdir}/${_arch}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -168,4 +164,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/aviion/conf/Makefile.aviion b/sys/arch/aviion/conf/Makefile.aviion
index c72d1725a67..1f573b5fc5c 100644
--- a/sys/arch/aviion/conf/Makefile.aviion
+++ b/sys/arch/aviion/conf/Makefile.aviion
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.aviion,v 1.33 2010/12/30 18:49:30 deraadt Exp $
+#	$OpenBSD: Makefile.aviion,v 1.34 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -74,7 +74,8 @@ PROFILE_C=	${CC} -S -c ${CFLAGS} ${CPPFLAGS} $<; \
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -94,10 +95,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -126,25 +133,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -163,4 +159,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/beagle/conf/Makefile.beagle b/sys/arch/beagle/conf/Makefile.beagle
index e55dbb1d342..2d429d93637 100644
--- a/sys/arch/beagle/conf/Makefile.beagle
+++ b/sys/arch/beagle/conf/Makefile.beagle
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.beagle,v 1.32 2010/12/30 18:49:30 deraadt Exp $
+#	$OpenBSD: Makefile.beagle,v 1.33 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	${_mach}_start.o locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD_HEAD+=; \
 		cat ${_archdir}/conf/ldscript.head ${_archdir}/conf/ldscript.tail | \
@@ -93,10 +94,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -125,25 +132,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/${_mach}_start.S ${_archdir}/${_arch}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -164,4 +160,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/gumstix/conf/Makefile.gumstix b/sys/arch/gumstix/conf/Makefile.gumstix
index a309621b2d9..11a5fe8b2a1 100644
--- a/sys/arch/gumstix/conf/Makefile.gumstix
+++ b/sys/arch/gumstix/conf/Makefile.gumstix
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.gumstix,v 1.30 2010/12/30 18:49:30 deraadt Exp $
+#	$OpenBSD: Makefile.gumstix,v 1.31 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	${_mach}_start.o locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD_HEAD+=; \
 		cat ${_archdir}/conf/ldscript.head ${_archdir}/conf/ldscript.tail | \
@@ -93,10 +94,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -125,25 +132,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/${_mach}_start.S ${_archdir}/${_arch}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -164,4 +160,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/hp300/conf/Makefile.hp300 b/sys/arch/hp300/conf/Makefile.hp300
index 6829b8f4398..079ab37fb21 100644
--- a/sys/arch/hp300/conf/Makefile.hp300
+++ b/sys/arch/hp300/conf/Makefile.hp300
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.hp300,v 1.73 2010/12/30 18:49:30 deraadt Exp $
+#	$OpenBSD: Makefile.hp300,v 1.74 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -105,7 +105,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o ${FPSP}
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -125,10 +126,16 @@ LINKFLAGS+=	-S
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -157,25 +164,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -194,4 +190,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/hppa/conf/Makefile.hppa b/sys/arch/hppa/conf/Makefile.hppa
index 821b913ccc3..7549ac8c239 100644
--- a/sys/arch/hppa/conf/Makefile.hppa
+++ b/sys/arch/hppa/conf/Makefile.hppa
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.hppa,v 1.64 2011/04/10 02:54:45 deraadt Exp $
+#	$OpenBSD: Makefile.hppa,v 1.65 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -78,7 +78,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -97,10 +98,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -130,25 +137,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -167,4 +163,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/hppa64/conf/Makefile.hppa64 b/sys/arch/hppa64/conf/Makefile.hppa64
index 294a6f572f8..863b8f4a3cb 100644
--- a/sys/arch/hppa64/conf/Makefile.hppa64
+++ b/sys/arch/hppa64/conf/Makefile.hppa64
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.hppa64,v 1.37 2011/04/10 03:03:29 deraadt Exp $
+#	$OpenBSD: Makefile.hppa64,v 1.38 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -70,7 +70,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -89,10 +90,16 @@ LINKFLAGS+=	-S
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -121,25 +128,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -158,4 +154,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/i386/conf/Makefile.i386 b/sys/arch/i386/conf/Makefile.i386
index e034d57f8f9..84e79021283 100644
--- a/sys/arch/i386/conf/Makefile.i386
+++ b/sys/arch/i386/conf/Makefile.i386
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.i386,v 1.79 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.i386,v 1.80 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -74,7 +74,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -94,10 +95,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -126,25 +133,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -163,4 +159,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/landisk/conf/Makefile.landisk b/sys/arch/landisk/conf/Makefile.landisk
index 5c4a01b4fd8..859c3377e5e 100644
--- a/sys/arch/landisk/conf/Makefile.landisk
+++ b/sys/arch/landisk/conf/Makefile.landisk
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.landisk,v 1.40 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.landisk,v 1.41 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -157,4 +153,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/loongson/conf/Makefile.loongson b/sys/arch/loongson/conf/Makefile.loongson
index 3ced1ebe183..ef8702a75b5 100644
--- a/sys/arch/loongson/conf/Makefile.loongson
+++ b/sys/arch/loongson/conf/Makefile.loongson
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.loongson,v 1.29 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.loongson,v 1.30 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -30,7 +30,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -75,7 +75,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -95,10 +96,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -131,25 +138,14 @@ symbols.sort: ${_machdir}/${_mach}/symbols.raw
 	grep -v '^#' ${_machdir}/${_mach}/symbols.raw \
 	    | sed 's/^	//' | sort -u > symbols.sort
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -169,4 +165,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/luna88k/conf/Makefile.luna88k b/sys/arch/luna88k/conf/Makefile.luna88k
index d90e9543c72..d2a32ac57de 100644
--- a/sys/arch/luna88k/conf/Makefile.luna88k
+++ b/sys/arch/luna88k/conf/Makefile.luna88k
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.luna88k,v 1.40 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.luna88k,v 1.41 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -72,7 +72,8 @@ PROFILE_C=	${CC} -S -c ${CFLAGS} ${CPPFLAGS} $<; \
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -92,10 +93,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -124,25 +131,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -161,4 +157,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/mac68k/conf/Makefile.mac68k b/sys/arch/mac68k/conf/Makefile.mac68k
index 887dd8e69a9..cac01ca8c30 100644
--- a/sys/arch/mac68k/conf/Makefile.mac68k
+++ b/sys/arch/mac68k/conf/Makefile.mac68k
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.mac68k,v 1.70 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.mac68k,v 1.71 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -70,7 +70,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o ${FPSP}
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -90,10 +91,16 @@ LINKFLAGS+=	-S
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -122,25 +129,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -159,4 +155,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/macppc/conf/Makefile.macppc b/sys/arch/macppc/conf/Makefile.macppc
index 27f57a837f3..bc75d8a982f 100644
--- a/sys/arch/macppc/conf/Makefile.macppc
+++ b/sys/arch/macppc/conf/Makefile.macppc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.macppc,v 1.59 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.macppc,v 1.60 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -157,4 +153,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/mvme68k/conf/Makefile.mvme68k b/sys/arch/mvme68k/conf/Makefile.mvme68k
index 203b031f657..a796544f7ae 100644
--- a/sys/arch/mvme68k/conf/Makefile.mvme68k
+++ b/sys/arch/mvme68k/conf/Makefile.mvme68k
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.mvme68k,v 1.61 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.mvme68k,v 1.62 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -71,7 +71,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o ${FPSP} ${060SP}
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -91,10 +92,16 @@ LINKFLAGS+=	-S
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -123,25 +130,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -160,4 +156,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/mvme88k/conf/Makefile.mvme88k b/sys/arch/mvme88k/conf/Makefile.mvme88k
index 5f22293e220..1d28011917f 100644
--- a/sys/arch/mvme88k/conf/Makefile.mvme88k
+++ b/sys/arch/mvme88k/conf/Makefile.mvme88k
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.mvme88k,v 1.70 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.mvme88k,v 1.71 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -69,7 +69,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD_TAIL}
 # Kernel is linked as a ZMAGIC executable, with start at 10020
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -89,10 +90,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -121,25 +128,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -158,4 +154,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/mvmeppc/conf/Makefile.mvmeppc b/sys/arch/mvmeppc/conf/Makefile.mvmeppc
index 395fc7de492..5304224ebeb 100644
--- a/sys/arch/mvmeppc/conf/Makefile.mvmeppc
+++ b/sys/arch/mvmeppc/conf/Makefile.mvmeppc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.mvmeppc,v 1.56 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.mvmeppc,v 1.57 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -157,4 +153,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/octeon/conf/Makefile.octeon b/sys/arch/octeon/conf/Makefile.octeon
index 88612147872..b055cb1de7d 100644
--- a/sys/arch/octeon/conf/Makefile.octeon
+++ b/sys/arch/octeon/conf/Makefile.octeon
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.octeon,v 1.4 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.octeon,v 1.5 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -30,7 +30,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -76,7 +76,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -95,10 +96,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -131,25 +138,14 @@ symbols.sort: ${_machdir}/${_mach}/symbols.raw
 	grep -v '^#' ${_machdir}/${_mach}/symbols.raw \
 	    | sed 's/^	//' | sort -u > symbols.sort
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -169,4 +165,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/palm/conf/Makefile.palm b/sys/arch/palm/conf/Makefile.palm
index e2477cb491c..4e67764101f 100644
--- a/sys/arch/palm/conf/Makefile.palm
+++ b/sys/arch/palm/conf/Makefile.palm
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.palm,v 1.27 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.palm,v 1.28 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	${_mach}_start.o locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD_HEAD+=; \
 		cat ${_archdir}/conf/ldscript.head ${_archdir}/conf/ldscript.tail | \
@@ -93,10 +94,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -125,25 +132,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/${_mach}_start.S ${_archdir}/${_arch}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -164,4 +160,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/sgi/conf/Makefile.sgi b/sys/arch/sgi/conf/Makefile.sgi
index c561cfc9a7d..c1e2b1aaa61 100644
--- a/sys/arch/sgi/conf/Makefile.sgi
+++ b/sys/arch/sgi/conf/Makefile.sgi
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.sgi,v 1.51 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.sgi,v 1.52 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -30,7 +30,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -75,7 +75,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -95,10 +96,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -131,25 +138,14 @@ symbols.sort: ${_machdir}/${_mach}/symbols.raw
 	grep -v '^#' ${_machdir}/${_mach}/symbols.raw \
 	    | sed 's/^	//' | sort -u > symbols.sort
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -169,4 +165,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/socppc/conf/Makefile.socppc b/sys/arch/socppc/conf/Makefile.socppc
index 52a3c373ad4..ad99ceeef63 100644
--- a/sys/arch/socppc/conf/Makefile.socppc
+++ b/sys/arch/socppc/conf/Makefile.socppc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.socppc,v 1.30 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.socppc,v 1.31 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -157,4 +153,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/solbourne/conf/Makefile.solbourne b/sys/arch/solbourne/conf/Makefile.solbourne
index 85096060c90..80d0391933f 100644
--- a/sys/arch/solbourne/conf/Makefile.solbourne
+++ b/sys/arch/solbourne/conf/Makefile.solbourne
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.solbourne,v 1.33 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.solbourne,v 1.34 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -156,4 +152,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/sparc/conf/Makefile.sparc b/sys/arch/sparc/conf/Makefile.sparc
index 2165a805a78..37cb471a4d8 100644
--- a/sys/arch/sparc/conf/Makefile.sparc
+++ b/sys/arch/sparc/conf/Makefile.sparc
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.sparc,v 1.69 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.sparc,v 1.70 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -71,7 +71,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -91,10 +92,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -123,25 +130,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -160,4 +156,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/sparc64/conf/Makefile.sparc64 b/sys/arch/sparc64/conf/Makefile.sparc64
index d3d2d4e55b5..5fc6ff3fb01 100644
--- a/sys/arch/sparc64/conf/Makefile.sparc64
+++ b/sys/arch/sparc64/conf/Makefile.sparc64
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.sparc64,v 1.56 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.sparc64,v 1.57 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S -x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.s
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -157,4 +153,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/vax/conf/Makefile.vax b/sys/arch/vax/conf/Makefile.vax
index 384d8fe64a9..11227d099b4 100644
--- a/sys/arch/vax/conf/Makefile.vax
+++ b/sys/arch/vax/conf/Makefile.vax
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.vax,v 1.61 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.vax,v 1.62 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD=	@echo ${LD} ${LINKFLAGS} -o $@ '$${SYSTEM_HEAD} vers.o $${OBJS}'; \
 		${LD} ${LINKFLAGS} -o $@ ${SYSTEM_HEAD} vers.o ${OBJS}
@@ -88,10 +89,16 @@ LINKFLAGS+=	-S
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -120,25 +127,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -157,4 +153,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES
diff --git a/sys/arch/zaurus/conf/Makefile.zaurus b/sys/arch/zaurus/conf/Makefile.zaurus
index b50b1aa070f..4f6729d3ccf 100644
--- a/sys/arch/zaurus/conf/Makefile.zaurus
+++ b/sys/arch/zaurus/conf/Makefile.zaurus
@@ -1,4 +1,4 @@
-#	$OpenBSD: Makefile.zaurus,v 1.40 2010/12/30 18:49:31 deraadt Exp $
+#	$OpenBSD: Makefile.zaurus,v 1.41 2011/04/15 02:41:28 guenther Exp $
 
 # For instructions on building kernels consult the config(8) and options(4)
 # manual pages.
@@ -23,7 +23,7 @@ _machdir?=	$S/arch/${_mach}
 _archdir?=	$S/arch/${_arch}
 
 INCLUDES=	-nostdinc -I. -I$S -I$S/arch
-CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__
+CPPFLAGS=	${INCLUDES} ${IDENT} ${PARAM} -D_KERNEL -D__${_mach}__ -MD -MP
 CWARNFLAGS=	-Werror -Wall -Wstrict-prototypes -Wmissing-prototypes \
 		-Wno-main -Wno-uninitialized -Wno-format \
 		-Wstack-larger-than-2047
@@ -68,7 +68,8 @@ NORMAL_S=	${CC} ${AFLAGS} ${CPPFLAGS} -c $<
 #	${SYSTEM_LD} swapxxx.o
 #	${SYSTEM_LD_TAIL}
 SYSTEM_HEAD=	${_mach}_start.o locore.o param.o ioconf.o
-SYSTEM_DEP=	Makefile ${SYSTEM_HEAD} ${OBJS}
+SYSTEM_OBJ=	${SYSTEM_HEAD} ${OBJS}
+SYSTEM_DEP=	Makefile ${SYSTEM_OBJ}
 SYSTEM_LD_HEAD=	@rm -f $@
 SYSTEM_LD_HEAD+=; \
 		cat ${_archdir}/conf/ldscript.head ${_archdir}/conf/ldscript.tail | \
@@ -93,10 +94,16 @@ LINKFLAGS+=	-x
 
 %LOAD
 
+# cc's -MD puts the source and output paths in the dependency file;
+# since those are temp files here we need to fix it up.  It also
+# puts the file in /tmp, so we use -MF to put it in the current
+# directory as assym.P and then generate assym.d from it with a
+# good target name
 assym.h: $S/kern/genassym.sh Makefile \
 	 ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf
 	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} > assym.h.tmp
+	    sh $S/kern/genassym.sh ${CC} ${CFLAGS} ${CPPFLAGS} -MF assym.P > assym.h.tmp
+	sed '1s/.*/assym.h: \\/' assym.P > assym.d
 	sort -u assym.h.tmp > assym.h
 
 param.c: $S/conf/param.c
@@ -125,25 +132,14 @@ lint:
 	    ${CFILES} ioconf.c param.c | \
 	    grep -v 'static function .* unused'
 
+depend:
+	@touch $@
+
 tags:
 	@echo "see $S/kern/Makefile for tags"
 
-AFILES=	${_machdir}/${_mach}/${_mach}_start.S ${_archdir}/${_arch}/locore.S
-depend:: .depend
-.depend: ${AFILES} param.c ioconf.c ${CFILES} ${SFILES} assym.h ${DB_STRUCTINFO}
-	${MKDEP} ${AFLAGS} ${CPPFLAGS} ${AFILES}
-	${MKDEP} -a ${CFLAGS} ${CPPFLAGS} param.c ioconf.c ${CFILES}
-.if !empty(SFILES)
-	${MKDEP} -a ${AFLAGS} ${CPPFLAGS} ${SFILES}
-.endif
-	cat ${_archdir}/${_arch}/genassym.cf ${_machdir}/${_mach}/genassym.cf | \
-	    sh $S/kern/genassym.sh ${MKDEP} -f assym.dep ${CFLAGS} ${CPPFLAGS}
-	@sed -e 's/.*\.o: /assym.h: /' -e 's/\/tmp\/genassym_c.[^ ]*//' \
-	    < assym.dep >> .depend
-	@rm -f assym.dep
-
 db_structinfo.h: $S/ddb/db_structinfo.c $S/ddb/parse_structinfo.awk
-	${CC} ${CFLAGS} ${CPPFLAGS} -gstabs -c $S/ddb/db_structinfo.c
+	${CC} ${CFLAGS} ${CPPFLAGS} -MT $@ -gstabs -c $S/ddb/db_structinfo.c
 	objdump -g db_structinfo.o | awk -f $S/ddb/parse_structinfo.awk > $@
 	rm -f db_structinfo.o
 
@@ -164,4 +160,16 @@ install-kernel-${MACHINE_NAME}:
 	mv /nbsd /bsd
 .endif
 
+# pull in the dependency information
+.if !empty(DB_STRUCTINFO) && !exists(${DB_STRUCTINFO})
+ ${SYSTEM_OBJ}: ${DB_STRUCTINFO}
+.endif
+.ifnmake clean
+. for o in ${SYSTEM_OBJ:.o=.d} assym.d ${DB_STRUCTINFO:.h=.d}
+.  if exists($o)
+.   include "$o"
+.  endif
+. endfor
+.endif
+
 %RULES