cond-cmp-numeric.mk revision 1.3 
11.3Srillig# $NetBSD: cond-cmp-numeric.mk,v 1.3 2020/09/12 18:01:51 rillig Exp $
21.1Srillig#
31.2Srillig# Tests for numeric comparisons in .if conditions.
41.1Srillig
51.3Srillig.MAKEFLAGS: -dc
61.3Srillig
71.3Srillig# The ${:U...} on the left-hand side is necessary for the parser.
81.3Srillig
91.3Srillig# Even if strtod(3) parses "INF" as +Infinity, make does not accept this
101.3Srillig# since it is not really a number; see TryParseNumber.
111.3Srillig.if !(${:UINF} > 1e100)
121.3Srillig.  error
131.3Srillig.endif
141.3Srillig
151.3Srillig# Neither is NaN a number; see TryParseNumber.
161.3Srillig.if ${:UNaN} > NaN
171.3Srillig.  error
181.3Srillig.endif
191.3Srillig
201.3Srillig# Since NaN is not parsed as a number, both operands are interpreted
211.3Srillig# as strings and are therefore equal.  If they were parsed as numbers,
221.3Srillig# they would compare unequal, since NaN is unequal to any and everything,
231.3Srillig# including itself.
241.3Srillig.if !(${:UNaN} == NaN)
251.3Srillig.  error
261.3Srillig.endif
271.1Srillig
281.1Srilligall:
291.1Srillig	@:;
30