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      1  1.3  rillig # $NetBSD: cond-cmp-numeric-lt.mk,v 1.3 2023/09/07 05:36:33 rillig Exp $
      2  1.1  rillig #
      3  1.1  rillig # Tests for numeric comparisons with the < operator in .if conditions.
      4  1.1  rillig 
      5  1.1  rillig # When both sides are equal, the < operator always yields false.
      6  1.1  rillig .if 1 < 1
      7  1.2  rillig .  error
      8  1.1  rillig .endif
      9  1.1  rillig 
     10  1.1  rillig # This comparison yields the same result, whether numeric or character-based.
     11  1.1  rillig .if 1 < 2
     12  1.1  rillig .else
     13  1.2  rillig .  error
     14  1.1  rillig .endif
     15  1.1  rillig 
     16  1.1  rillig .if 2 < 1
     17  1.2  rillig .  error
     18  1.1  rillig .endif
     19  1.1  rillig 
     20  1.1  rillig # If this comparison were character-based instead of numerical, the
     21  1.1  rillig # 5 would be > 14 since its first digit is greater.
     22  1.1  rillig .if 5 < 14
     23  1.1  rillig .else
     24  1.2  rillig .  error
     25  1.1  rillig .endif
     26  1.1  rillig 
     27  1.1  rillig .if 14 < 5
     28  1.2  rillig .  error
     29  1.1  rillig .endif
     30  1.1  rillig 
     31  1.1  rillig # Scientific notation is supported, as per strtod.
     32  1.1  rillig .if 2e7 < 1e8
     33  1.1  rillig .else
     34  1.2  rillig .  error
     35  1.1  rillig .endif
     36  1.1  rillig 
     37  1.1  rillig .if 1e8 < 2e7
     38  1.2  rillig .  error
     39  1.1  rillig .endif
     40  1.1  rillig 
     41  1.1  rillig # Floating pointer numbers can be compared as well.
     42  1.1  rillig # This might be tempting to use for version numbers, but there are a few pitfalls.
     43  1.1  rillig .if 3.141 < 111.222
     44  1.1  rillig .else
     45  1.2  rillig .  error
     46  1.1  rillig .endif
     47  1.1  rillig 
     48  1.1  rillig .if 111.222 < 3.141
     49  1.2  rillig .  error
     50  1.1  rillig .endif
     51  1.1  rillig 
     52  1.1  rillig # When parsed as a version number, 3.30 is greater than 3.7.
     53  1.1  rillig # Since make parses numbers as plain numbers, that leads to wrong results.
     54  1.1  rillig # Numeric comparisons are not suited for comparing version number.
     55  1.1  rillig .if 3.30 < 3.7
     56  1.1  rillig .else
     57  1.2  rillig .  error
     58  1.1  rillig .endif
     59  1.1  rillig 
     60  1.1  rillig .if 3.7 < 3.30
     61  1.2  rillig .  error
     62  1.1  rillig .endif
     63  1.1  rillig 
     64  1.3  rillig # Numeric comparison works by parsing both sides
     65  1.1  rillig # as double, and then performing a normal comparison.  The range of double is
     66  1.1  rillig # typically 16 or 17 significant digits, therefore these two numbers seem to
     67  1.1  rillig # be equal.
     68  1.1  rillig .if 1.000000000000000001 < 1.000000000000000002
     69  1.2  rillig .  error
     70  1.1  rillig .endif
     71  1.1  rillig 
     72  1.1  rillig all:
     73  1.1  rillig 	@:;
     74