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      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 
     72 all:
     73 	@:;
     74