FAST_DEPEND: Don't waste time generating an empty .depend file.

The .depend file will still be generated if _EXTRADEPEND is used.  The target
is kept with a dependency on DPSRCS though so that 'make depend' will generate
all files.

Sponsored by:	EMC / Isilon Storage Division

2 files changed, 2 insertions, 4 deletions

diff --git a/share/mk/bsd.dep.mk b/share/mk/bsd.dep.mk
index ec2ac1fc58ef..2b9301eed7d6 100644
--- a/share/mk/bsd.dep.mk
+++ b/share/mk/bsd.dep.mk
@@ -246,6 +246,8 @@ MKDEP_CXXFLAGS=	${CXXFLAGS:M-nostdinc*} ${CXXFLAGS:M-[BIDU]*} \
 .endif	# ${MK_FAST_DEPEND} == "no"
 
 DPSRCS+= ${SRCS}
+# FAST_DEPEND will only generate a .depend if _EXTRADEPEND is used but
+# the target is created to allow 'make depend' to generate files.
 ${DEPENDFILE}: ${DPSRCS}
 .if ${MK_FAST_DEPEND} == "no"
 	rm -f ${DEPENDFILE}
@@ -260,8 +262,6 @@ ${DEPENDFILE}: ${DPSRCS}
 	    ${.ALLSRC:M*.cc} ${.ALLSRC:M*.C} ${.ALLSRC:M*.cpp} ${.ALLSRC:M*.cxx}
 .else
 .endif
-.else
-	: > ${.TARGET}
 .endif	# ${MK_FAST_DEPEND} == "no"
 .if target(_EXTRADEPEND)
 _EXTRADEPEND: .USE
diff --git a/sys/conf/kern.post.mk b/sys/conf/kern.post.mk
index f1ab570edac1..f16acda4ab0a 100644
--- a/sys/conf/kern.post.mk
+++ b/sys/conf/kern.post.mk
@@ -278,8 +278,6 @@ ${__obj}: ${OBJS_DEPEND_GUESS.${__obj}}
 	${MAKE} -V SFILES_CDDL | \
 	    CC="${_MKDEPCC}" xargs mkdep -a -f ${.TARGET}.tmp ${ZFS_ASM_CFLAGS}
 	mv ${.TARGET}.tmp ${.TARGET}
-.else
-	: > ${.TARGET}
 .endif
 
 _ILINKS= machine