1# $FreeBSD$ 2 3# This target is "special". 4# 5# The actual work is done via another target; 6# UNIVERSE_TARGET_RELDIR is used to identify it. 7# 8# We leverage dirdeps.mk to run a sub-make per 9# MACHINE/ARCH to each build ${UNIVERSE_TARGET_RELDIR} 10# in meta mode. 11# 12# We simply override the level at which dirdeps.mk normally does 13# its thing, and give it a DIRDEPS list that corresponds to 14# ${UNIVERSE_TARGET_RELDIR}.${TARGET_SPEC} for each TARGET_SPEC we 15# want. 16# 17# This allows the computation of dependencies for each ${TARGET_SPEC} 18# to happen in parallel - avoiding a very long startup time. 19# We can even export each sub-make to a different machine if using a 20# cluster. 21# 22# The above works fine so long as our sub-makes remain independent. 23# That is; none of them attempts to visit any directory for a machine 24# other than the TARGET_SPEC we gave it. 25# For example; to build some tool for the pseudo machine "host". 26# To avoid that, our Makefile.depend lists all the hosttools we might 27# need and these will thus be built before we launch the 28# ${UNIVERSE_TARGET_RELDIR} sub-makes. 29# Further we add a filter to skip any "host" dirdeps during those 30# sub-makes. 31# 32# 33 34# this is the RELDIR of the target we build 35UNIVERSE_TARGET_RELDIR?= targets/pseudo/the-lot 36 37# the list of machines 38TARGET_MACHINE_LIST = i386 amd64 39 40# avoid ../Makefile.inc defining this 41all: 42 43.include "../Makefile.inc" 44 45.if ${.MAKE.LEVEL} > 0 46# ok our prerequisites have been built 47.if !defined(UNIVERSE_GUARD) 48# just incase we end up back here, 49# we cannot rely on .MAKE.LEVEL as we normally would 50UNIVERSE_GUARD=1 51.export UNIVERSE_GUARD 52 53# we want to re-use dirdeps 54_DIRDEP_USE_LEVEL = ${.MAKE.LEVEL} 55 56# we want our sub-makes to think they are level 0 57# and we don't want failure of one to stop all. 58DIRDEP_USE_ENV= \ 59 MAKELEVEL=0 \ 60 MAKE_JOB_ERROR_TOKEN=no 61 62 63_target_specs:= ${TARGET_MACHINE_LIST:@m@${TARGET_ARCHES_$m:U$m:@a@$m,$a@}@:O:u} 64 65DIRDEPS:= ${_target_specs:@t@${UNIVERSE_TARGET_RELDIR}.$t@} 66 67all: dirdeps 68 69.include <dirdeps.mk> 70.endif 71.endif 72