2c3632d14f
Lots of code refactoring, simplification and cleanup. Lots of new unit-tests providing much higher code coverage. All courtesy of rillig at netbsd. Other significant changes: o new read-only variable .SHELL which provides the path of the shell used to run scripts (as defined by the .SHELL target). o variable parsing detects more errors. o new debug option -dl: LINT mode, does the equivalent of := for all variable assignments so that file and line number are reported for variable parse errors.
74 lines
1.4 KiB
Makefile
Executable File
74 lines
1.4 KiB
Makefile
Executable File
# $NetBSD: cond-cmp-numeric-lt.mk,v 1.1 2020/08/23 13:50:17 rillig Exp $
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#
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# Tests for numeric comparisons with the < operator in .if conditions.
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# When both sides are equal, the < operator always yields false.
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.if 1 < 1
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.error
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.endif
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# This comparison yields the same result, whether numeric or character-based.
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.if 1 < 2
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.else
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.error
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.endif
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.if 2 < 1
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.error
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.endif
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# If this comparison were character-based instead of numerical, the
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# 5 would be > 14 since its first digit is greater.
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.if 5 < 14
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.else
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.error
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.endif
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.if 14 < 5
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.error
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.endif
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# Scientific notation is supported, as per strtod.
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.if 2e7 < 1e8
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.else
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.error
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.endif
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.if 1e8 < 2e7
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.error
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.endif
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# Floating pointer numbers can be compared as well.
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# This might be tempting to use for version numbers, but there are a few pitfalls.
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.if 3.141 < 111.222
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.else
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.error
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.endif
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.if 111.222 < 3.141
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.error
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.endif
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# When parsed as a version number, 3.30 is greater than 3.7.
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# Since make parses numbers as plain numbers, that leads to wrong results.
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# Numeric comparisons are not suited for comparing version number.
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.if 3.30 < 3.7
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.else
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.error
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.endif
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.if 3.7 < 3.30
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.error
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.endif
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# As of 2020-08-23, numeric comparison is implemented as parsing both sides
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# as double, and then performing a normal comparison. The range of double is
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# typically 16 or 17 significant digits, therefore these two numbers seem to
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# be equal.
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.if 1.000000000000000001 < 1.000000000000000002
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.error
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.endif
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all:
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@:;
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