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Avoid reading .depend.* in simple cases where not needed.

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This will speed up some tree-walks with FAST_DEPEND which otherwise
would include length(SRCS) .depend files.

This also uses a trick suggested by sjg@ to still read them in when
specifying _V_READ_DEPEND=1 in the env/make args.

Sponsored by:	EMC / Isilon Storage Division
This commit is contained in:
Bryan Drewery 2016-02-19 00:41:24 +00:00
parent 40bf7442fa
commit 9fb02a70d0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=295779
2 changed files with 21 additions and 2 deletions
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12
share/mk/bsd.dep.mk
View File

@ -81,6 +81,16 @@ tags: ${SRCS}
.endif
.endif
# Skip reading .depend when not needed to speed up tree-walks
# and simple lookups.
.if !empty(.MAKEFLAGS:M-V${_V_READ_DEPEND}) || make(obj) || make(clean*) || \
make(install*)
_SKIP_READ_DEPEND= 1
.if ${MK_DIRDEPS_BUILD} == "no"
.MAKE.DEPENDFILE= /dev/null
.endif
.endif
.if defined(SRCS)
CLEANFILES?=
@ -181,7 +191,7 @@ DEPENDSRCS= ${SRCS:M*.[cSC]} ${SRCS:M*.cxx} ${SRCS:M*.cpp} ${SRCS:M*.cc}
DEPENDOBJS+= ${DEPENDSRCS:R:S,$,.o,}
.endif
DEPENDFILES_OBJS= ${DEPENDOBJS:O:u:${DEPEND_FILTER}:C/^/${DEPENDFILE}./}
.if ${.MAKEFLAGS:M-V} == ""
.if !defined(_SKIP_READ_DEPEND)
.for __depend_obj in ${DEPENDFILES_OBJS}
.sinclude "${__depend_obj}"
.endfor

11
sys/conf/kern.post.mk
View File

@ -206,6 +206,15 @@ CFILES_OFED=${CFILES:M*/ofed/*}
# We have "special" -I include paths for MLX5.
CFILES_MLX5=${CFILES:M*/dev/mlx5/*}
# Skip reading .depend when not needed to speed up tree-walks
# and simple lookups.
.if !empty(.MAKEFLAGS:M-V${_V_READ_DEPEND}) || make(obj) || make(clean*) || \
make(install*) || make(kernel-obj) || make(kernel-clean*) || \
make(kernel-install*)
_SKIP_READ_DEPEND= 1
.MAKE.DEPENDFILE= /dev/null
.endif
kernel-depend: .depend
# The argument list can be very long, so use make -V and xargs to
# pass it to mkdep.
@ -222,7 +231,7 @@ DEPEND_CFLAGS+= -MT${.TARGET}
CFLAGS+= ${DEPEND_CFLAGS}
DEPENDOBJS+= ${SYSTEM_OBJS} genassym.o
DEPENDFILES_OBJS= ${DEPENDOBJS:O:u:C/^/.depend./}
.if ${.MAKEFLAGS:M-V} == ""
.if !defined(_SKIP_READ_DEPEND)
.for __depend_obj in ${DEPENDFILES_OBJS}
.sinclude "${__depend_obj}"
.endfor