1# $NetBSD: cond-cmp-numeric-lt.mk,v 1.3 2023/09/07 05:36:33 rillig Exp $ 2# 3# Tests for numeric comparisons with the < operator in .if conditions. 4 5# When both sides are equal, the < operator always yields false. 6.if 1 < 1 7. error 8.endif 9 10# This comparison yields the same result, whether numeric or character-based. 11.if 1 < 2 12.else 13. error 14.endif 15 16.if 2 < 1 17. error 18.endif 19 20# If this comparison were character-based instead of numerical, the 21# 5 would be > 14 since its first digit is greater. 22.if 5 < 14 23.else 24. error 25.endif 26 27.if 14 < 5 28. error 29.endif 30 31# Scientific notation is supported, as per strtod. 32.if 2e7 < 1e8 33.else 34. error 35.endif 36 37.if 1e8 < 2e7 38. error 39.endif 40 41# Floating pointer numbers can be compared as well. 42# This might be tempting to use for version numbers, but there are a few pitfalls. 43.if 3.141 < 111.222 44.else 45. error 46.endif 47 48.if 111.222 < 3.141 49. error 50.endif 51 52# When parsed as a version number, 3.30 is greater than 3.7. 53# Since make parses numbers as plain numbers, that leads to wrong results. 54# Numeric comparisons are not suited for comparing version number. 55.if 3.30 < 3.7 56.else 57. error 58.endif 59 60.if 3.7 < 3.30 61. error 62.endif 63 64# Numeric comparison works by parsing both sides 65# as double, and then performing a normal comparison. The range of double is 66# typically 16 or 17 significant digits, therefore these two numbers seem to 67# be equal. 68.if 1.000000000000000001 < 1.000000000000000002 69. error 70.endif 71 72all: 73 @:; 74