62 lines
2.3 KiB
Makefile
62 lines
2.3 KiB
Makefile
# $NetBSD: dotwait.mk,v 1.1 2014/08/21 13:44:51 apb Exp $
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THISMAKEFILE:= ${.PARSEDIR}/${.PARSEFILE}
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TESTS= simple recursive shared cycle
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PAUSE= sleep 1
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# Use a .for loop rather than dependencies here, to ensure
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# that the tests are run one by one, with parallelism
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# only within tests.
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# Ignore "--- target ---" lines printed by parallel make.
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all:
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.for t in ${TESTS}
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@${.MAKE} -f ${THISMAKEFILE} -j4 $t | grep -v "^--- "
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.endfor
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#
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# Within each test, the names of the sub-targets follow these
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# conventions:
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# * If it's expected that two or more targets may be made in parallel,
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# then the target names will differ only in an alphabetic component
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# such as ".a" or ".b".
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# * If it's expected that two or more targets should be made in sequence
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# then the target names will differ in numeric components, such that
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# lexical ordering of the target names matches the expected order
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# in which the targets should be made.
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#
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# Targets may echo ${PARALLEL_TARG} to print a modified version
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# of their own name, in which alphabetic components like ".a" or ".b"
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# are converted to ".*". Two targets that are expected to
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# be made in parallel will thus print the same strings, so that the
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# output is independent of the order in which these targets are made.
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#
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PARALLEL_TARG= ${.TARGET:C/\.[a-z]/.*/g:Q}
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.DEFAULT:
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@echo ${PARALLEL_TARG}; ${PAUSE}; echo ${PARALLEL_TARG}
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_ECHOUSE: .USE
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@echo ${PARALLEL_TARG}; ${PAUSE}; echo ${PARALLEL_TARG}
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# simple: no recursion, no cycles
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simple: simple.1 .WAIT simple.2
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# recursive: all children of the left hand side of the .WAIT
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# must be made before any child of the right hand side.
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recursive: recursive.1.99 .WAIT recursive.2.99
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recursive.1.99: recursive.1.1.a recursive.1.1.b _ECHOUSE
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recursive.2.99: recursive.2.1.a recursive.2.1.b _ECHOUSE
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# shared: both shared.1.99 and shared.2.99 depend on shared.0.
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# shared.0 must be made first, even though it is a child of
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# the right hand side of the .WAIT.
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shared: shared.1.99 .WAIT shared.2.99
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shared.1.99: shared.0 _ECHOUSE
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shared.2.99: shared.2.1 shared.0 _ECHOUSE
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# cycle: the cyclic dependency must not cause infinite recursion
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# leading to stack overflow and a crash.
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cycle: cycle.1.99 .WAIT cycle.2.99
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cycle.2.99: cycle.2.98 _ECHOUSE
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cycle.2.98: cycle.2.97 _ECHOUSE
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cycle.2.97: cycle.2.99 _ECHOUSE
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