74 lines
1.4 KiB
Makefile
74 lines
1.4 KiB
Makefile
# $NetBSD: cond-cmp-numeric-gt.mk,v 1.2 2020/10/24 08:46:08 rillig Exp $
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#
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# Tests for numeric comparisons with the > operator in .if conditions.
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# When both sides are equal, the > operator always yields false.
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.if 1 > 1
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. error
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.endif
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# This comparison yields the same result, whether numeric or character-based.
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.if 1 > 2
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. error
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.endif
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.if 2 > 1
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.else
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. error
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.endif
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# If this comparison were character-based instead of numerical, the
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# 5 would be > 14 since its first digit is greater.
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.if 5 > 14
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. error
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.endif
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.if 14 > 5
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.else
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. error
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.endif
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# Scientific notation is supported, as per strtod.
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.if 2e7 > 1e8
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. error
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.endif
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.if 1e8 > 2e7
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.else
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. error
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.endif
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# Floating pointer numbers can be compared as well.
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# This might be tempting to use for version numbers, but there are a few pitfalls.
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.if 3.141 > 111.222
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. error
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.endif
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.if 111.222 > 3.141
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.else
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. error
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.endif
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# When parsed as a version number, 3.30 is greater than 3.7.
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# Since make parses numbers as plain numbers, that leads to wrong results.
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# Numeric comparisons are not suited for comparing version number.
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.if 3.30 > 3.7
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. error
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.endif
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.if 3.7 > 3.30
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.else
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. error
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.endif
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# As of 2020-08-23, numeric comparison is implemented as parsing both sides
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# as double, and then performing a normal comparison. The range of double is
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# typically 16 or 17 significant digits, therefore these two numbers seem to
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# be equal.
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.if 1.000000000000000001 > 1.000000000000000002
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. error
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.endif
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all:
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@:;
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