1# $NetBSD: dotwait.mk,v 1.3 2020/10/24 08:50:17 rillig Exp $ 2 3THISMAKEFILE:= ${.PARSEDIR}/${.PARSEFILE} 4 5TESTS= simple recursive shared cycle 6PAUSE= sleep 1 7 8# Use a .for loop rather than dependencies here, to ensure 9# that the tests are run one by one, with parallelism 10# only within tests. 11# Ignore "--- target ---" lines printed by parallel make. 12all: 13.for t in ${TESTS} 14 @${.MAKE} -f ${THISMAKEFILE} -j4 $t 2>&1 | grep -v "^--- " 15.endfor 16 17# 18# Within each test, the names of the sub-targets follow these 19# conventions: 20# * If it's expected that two or more targets may be made in parallel, 21# then the target names will differ only in an alphabetic component 22# such as ".a" or ".b". 23# * If it's expected that two or more targets should be made in sequence 24# then the target names will differ in numeric components, such that 25# lexical ordering of the target names matches the expected order 26# in which the targets should be made. 27# 28# Targets may echo ${PARALLEL_TARG} to print a modified version 29# of their own name, in which alphabetic components like ".a" or ".b" 30# are converted to ".*". Two targets that are expected to 31# be made in parallel will thus print the same strings, so that the 32# output is independent of the order in which these targets are made. 33# 34PARALLEL_TARG= ${.TARGET:C/\.[a-z]/.*/g:Q} 35.DEFAULT: 36 @echo ${PARALLEL_TARG}; ${PAUSE}; echo ${PARALLEL_TARG} 37_ECHOUSE: .USE 38 @echo ${PARALLEL_TARG}; ${PAUSE}; echo ${PARALLEL_TARG} 39 40# simple: no recursion, no cycles 41simple: simple.1 .WAIT simple.2 42 43# recursive: all children of the left hand side of the .WAIT 44# must be made before any child of the right hand side. 45recursive: recursive.1.99 .WAIT recursive.2.99 46recursive.1.99: recursive.1.1.a recursive.1.1.b _ECHOUSE 47recursive.2.99: recursive.2.1.a recursive.2.1.b _ECHOUSE 48 49# shared: both shared.1.99 and shared.2.99 depend on shared.0. 50# shared.0 must be made first, even though it is a child of 51# the right hand side of the .WAIT. 52shared: shared.1.99 .WAIT shared.2.99 53shared.1.99: shared.0 _ECHOUSE 54shared.2.99: shared.2.1 shared.0 _ECHOUSE 55 56# cycle: the cyclic dependency must not cause infinite recursion 57# leading to stack overflow and a crash. 58cycle: cycle.1.99 .WAIT cycle.2.99 59cycle.2.99: cycle.2.98 _ECHOUSE 60cycle.2.98: cycle.2.97 _ECHOUSE 61cycle.2.97: cycle.2.99 _ECHOUSE 62