+ Use the default cscope names.

+ Enable fast symbol lookup.
+ Make sure files cscoped are really files, and add .S's.
+ Add 'cscope-clean' target.

sys/Makefile

@@ -8,8 +8,8 @@ SUBDIR=	boot
 .endif
 
 # Directories to include in cscope name file and TAGS.
-CSCOPEDIRS=	boot bsm cam compat conf contrib crypto ddb dev fs gdb geom gnu \
-		i4b isa kern libkern modules net net80211 netatalk netatm \
+CSCOPEDIRS=	boot bsm cam compat conf contrib crypto ddb dev fs gdb geom \
+		gnu i4b isa kern libkern modules net net80211 netatalk netatm \
 		netgraph netinet netinet6 netipsec netipx netnatm netncp \
 		netsmb nfs nfs4client nfsclient nfsserver opencrypto pccard \
 		pci rpc security sys ufs vm ${ARCHDIR}
@@ -25,15 +25,20 @@ SUBDIR+=modules
 HTAGSFLAGS+= -at `awk -F= '/^RELEASE *=/{release=$2}; END {print "FreeBSD", release, "kernel"}' < conf/newvers.sh`
 
 # You need the devel/cscope port for this.
-cscope:	${.CURDIR}/cscopenamefile
-	cd ${.CURDIR}; cscope -k -p4 -i cscopenamefile
+cscope: cscope.out
+cscope.out: ${.CURDIR}/cscope.files
+	cd ${.CURDIR}; cscope -k -buq -p4
 
-${.CURDIR}/cscopenamefile: 
-	cd ${.CURDIR}; find ${CSCOPEDIRS} -name "*.[csh]" > ${.TARGET}
+${.CURDIR}/cscope.files: .PHONY
+	cd ${.CURDIR}; \
+		find ${CSCOPEDIRS} -name "*.[chSs]" -a -type f > ${.TARGET}
+
+cscope-clean:
+	rm -f cscope.files cscope.out cscope.in.out cscope.po.out
 
 # You need the devel/global and one of editor/emacs* ports for that.
-TAGS ${.CURDIR}/TAGS:	${.CURDIR}/cscopenamefile
+TAGS ${.CURDIR}/TAGS: ${.CURDIR}/cscope.files
 	rm -f ${.CURDIR}/TAGS
-	cd ${.CURDIR}; xargs etags -a < ${.CURDIR}/cscopenamefile
+	cd ${.CURDIR}; xargs etags -a < ${.CURDIR}/cscope.files
 
 .include <bsd.subdir.mk>