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-rw-r--r--contrib/bmake/mk/meta.sys.mk139
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diff --git a/contrib/bmake/mk/meta.sys.mk b/contrib/bmake/mk/meta.sys.mk
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+# $Id: meta.sys.mk,v 1.16 2012/07/03 05:26:00 sjg Exp $
+
+#
+# @(#) Copyright (c) 2010, Simon J. Gerraty
+#
+# This file is provided in the hope that it will
+# be of use. There is absolutely NO WARRANTY.
+# Permission to copy, redistribute or otherwise
+# use this file is hereby granted provided that
+# the above copyright notice and this notice are
+# left intact.
+#
+# Please send copies of changes and bug-fixes to:
+# sjg@crufty.net
+#
+
+# include this if you want to enable meta mode
+# for maximum benefit, requires filemon(4) driver.
+
+.if ${MAKE_VERSION:U0} > 20100901
+.if !target(.ERROR)
+
+
+META_MODE += meta verbose
+.MAKE.MODE ?= ${META_MODE}
+
+.if ${.MAKE.LEVEL} == 0
+_make_mode := ${.MAKE.MODE} ${META_MODE}
+.if ${_make_mode:M*read*} != "" || ${_make_mode:M*nofilemon*} != ""
+# tell everyone we are not updating Makefile.depend*
+UPDATE_DEPENDFILE = NO
+.export UPDATE_DEPENDFILE
+.endif
+.if ${UPDATE_DEPENDFILE:Uyes:tl} == "no" && !exists(/dev/filemon)
+# we should not get upset
+META_MODE += nofilemon
+.export META_MODE
+.endif
+.endif
+
+.if !defined(NO_SILENT)
+.if ${MAKE_VERSION} > 20110818
+# only be silent when we have a .meta file
+META_MODE += silent=yes
+.else
+.SILENT:
+.endif
+.endif
+
+# make defaults .MAKE.DEPENDFILE to .depend
+# that won't work for us.
+.if ${.MAKE.DEPENDFILE} == ".depend"
+.undef .MAKE.DEPENDFILE
+.endif
+
+# if you don't cross build for multiple MACHINEs concurrently, then
+# .MAKE.DEPENDFILE = Makefile.depend
+# probably makes sense - you can set that in local.sys.mk
+.MAKE.DEPENDFILE ?= Makefile.depend.${MACHINE}
+
+# we use the pseudo machine "host" for the build host.
+# this should be taken care of before we get here
+.if ${OBJTOP:Ua} == ${HOST_OBJTOP:Ub}
+MACHINE = host
+.endif
+
+.if ${.MAKE.LEVEL} == 0
+# it can be handy to know which MACHINE kicked off the build
+# for example, if using Makefild.depend for multiple machines,
+# allowing only MACHINE0 to update can keep things simple.
+MACHINE0 := ${MACHINE}
+
+.if defined(PYTHON) && exists(${PYTHON})
+# we prefer the python version of this - it is much faster
+META2DEPS ?= ${.PARSEDIR}/meta2deps.py
+.else
+META2DEPS ?= ${.PARSEDIR}/meta2deps.sh
+.endif
+META2DEPS := ${META2DEPS}
+.export META2DEPS
+.endif
+
+MAKE_PRINT_VAR_ON_ERROR += \
+ .ERROR_TARGET \
+ .ERROR_META_FILE \
+ .MAKE.LEVEL \
+ MAKEFILE \
+ .MAKE.MODE
+
+.if !defined(SB) && defined(SRCTOP)
+SB = ${SRCTOP:H}
+.endif
+ERROR_LOGDIR ?= ${SB}/error
+meta_error_log = ${ERROR_LOGDIR}/meta-${.MAKE.PID}.log
+
+# we are not interested in make telling us a failure happened elsewhere
+.ERROR: _metaError
+_metaError: .NOMETA .NOTMAIN
+ -@[ "${.ERROR_META_FILE}" ] && { \
+ grep -q 'failure has been detected in another branch' ${.ERROR_META_FILE} && exit 0; \
+ mkdir -p ${meta_error_log:H}; \
+ cp ${.ERROR_META_FILE} ${meta_error_log}; \
+ echo "ERROR: log ${meta_error_log}" >&2; }; :
+
+.endif
+
+# Are we, after all, in meta mode?
+.if ${.MAKE.MODE:Mmeta*} != ""
+MKDEP = meta.autodep
+
+.if ${.MAKE.LEVEL} == 0
+# make sure dirdeps target exists and do it first
+all: dirdeps .WAIT
+dirdeps:
+.NOPATH: dirdeps
+
+.if defined(ALL_MACHINES)
+# the first .MAIN: is what counts
+# by default dirdeps is all we want at level0
+.MAIN: dirdeps
+# tell dirdeps.mk what we want
+BUILD_AT_LEVEL0 = no
+.endif
+
+.if ${.MAKE.DEPENDFILE:E} == ${MACHINE}
+# it works best if we do everything via sub-makes
+BUILD_AT_LEVEL0 ?= no
+.endif
+BUILD_AT_LEVEL0 ?= yes
+.endif
+
+# if we think we are updating dependencies,
+# then filemon had better be present
+.if ${UPDATE_DEPENDFILE:Uyes:tl} != "no" && !exists(/dev/filemon)
+.error ${.newline}ERROR: The filemon module (/dev/filemon) is not loaded.
+.endif
+
+.endif
+.endif
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