From 68add213442714579fd5bdc73b52a8df0dbbb9cb Mon Sep 17 00:00:00 2001
From: Bryan Drewery <bdrewery@FreeBSD.org>
Date: Wed, 24 Feb 2016 17:19:09 +0000
Subject: [PATCH] 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
---
 share/mk/bsd.dep.mk   | 4 ++--
 sys/conf/kern.post.mk | 2 --
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/share/mk/bsd.dep.mk b/share/mk/bsd.dep.mk
index ec2ac1fc58e..2b9301eed7d 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 f1ab570edac..f16acda4ab0 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
-- 
2.45.2