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1b65f0bd2b
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable checks in InitObjdir. Explicit .OBJDIR target always allows read-only directory. o Fix building and unit-tests on non-BSD. o More code cleanup and refactoring. o More unit tests
44 lines
1.4 KiB
Makefile
44 lines
1.4 KiB
Makefile
# $NetBSD: varmod-order-shuffle.mk,v 1.6 2020/11/09 20:16:33 rillig Exp $
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#
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# Tests for the :Ox variable modifier, which returns the words of the
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# variable, shuffled.
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#
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# The variable modifier :Ox is available since 2005-06-01.
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#
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# As of 2020-08-16, make uses random(3) seeded by the current time in seconds.
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# This makes the random numbers completely predictable since there is no other
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# part of make that uses random numbers.
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#
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# Tags: probabilistic
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NUMBERS= one two three four five six seven eight nine ten
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# Note that 1 in every 10! trials two independently generated
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# randomized orderings will be the same. The test framework doesn't
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# support checking probabilistic output, so we accept that each of the
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# 3 :Ox tests will incorrectly fail with probability 2.756E-7, which
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# lets the whole test fail once in 1.209.600 runs, on average.
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# Create two shuffles using the := assignment operator.
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shuffled1:= ${NUMBERS:Ox}
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shuffled2:= ${NUMBERS:Ox}
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.if ${shuffled1} == ${shuffled2}
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. error ${shuffled1} == ${shuffled2}
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.endif
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# Sorting the list before shuffling it has no effect.
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shuffled1:= ${NUMBERS:O:Ox}
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shuffled2:= ${NUMBERS:O:Ox}
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.if ${shuffled1} == ${shuffled2}
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. error ${shuffled1} == ${shuffled2}
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.endif
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# Sorting after shuffling must produce the original numbers.
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sorted:= ${NUMBERS:Ox:O}
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.if ${sorted} != ${NUMBERS:O}
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. error ${sorted} != ${NUMBERS:O}
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.endif
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all:
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@:;
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