1b82cb8766
Neither is recognized by the make parser, which is good since the main task of make is dependency resolution and text processing, not calculating.
30 lines
744 B
Makefile
30 lines
744 B
Makefile
# $NetBSD: cond-cmp-numeric.mk,v 1.3 2020/09/12 18:01:51 rillig Exp $
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#
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# Tests for numeric comparisons in .if conditions.
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.MAKEFLAGS: -dc
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# The ${:U...} on the left-hand side is necessary for the parser.
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# Even if strtod(3) parses "INF" as +Infinity, make does not accept this
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# since it is not really a number; see TryParseNumber.
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.if !(${:UINF} > 1e100)
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. error
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.endif
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# Neither is NaN a number; see TryParseNumber.
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.if ${:UNaN} > NaN
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. error
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.endif
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# Since NaN is not parsed as a number, both operands are interpreted
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# as strings and are therefore equal. If they were parsed as numbers,
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# they would compare unequal, since NaN is unequal to any and everything,
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# including itself.
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.if !(${:UNaN} == NaN)
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. error
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.endif
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all:
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@:;
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