e2eeea75eb
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable checks in InitObjdir. Explicit .OBJDIR target always allows read-only directory. o More code cleanup and refactoring. o More unit tests MFC after: 1 week
82 lines
1.6 KiB
Makefile
Executable File
82 lines
1.6 KiB
Makefile
Executable File
# $NetBSD: cond-cmp-numeric-eq.mk,v 1.5 2020/11/08 21:47:59 rillig Exp $
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#
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# Tests for numeric comparisons with the == operator in .if conditions.
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# This comparison yields the same result, whether numeric or character-based.
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.if 1 == 1
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.else
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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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. 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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# Scientific notation is supported, as per strtod.
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.if 2e7 == 2000e4
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.else
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. error
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.endif
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.if 2000e4 == 2e7
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.else
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. error
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.endif
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# Trailing zeroes after the decimal point are irrelevant for the numeric
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# value.
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.if 3.30000 == 3.3
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.else
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. error
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.endif
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.if 3.3 == 3.30000
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.else
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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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.else
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. error
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.endif
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# Because an IEEE 754 double can only hold integers with a mantissa of 53
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# bits, these two numbers are considered the same. The 993 is rounded down
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# to the 992.
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.if 9007199254740993 == 9007199254740992
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.else
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. error
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.endif
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# The 995 is rounded up, the 997 is rounded down.
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.if 9007199254740995 == 9007199254740997
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.else
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. error Probably a misconfiguration in the floating point environment, \
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or maybe a machine without IEEE 754 floating point support.
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.endif
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# There is no = operator for numbers.
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.if !(12345 = 12345)
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. error
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.else
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. error
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.endif
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# There is no === operator for numbers either.
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.if !(12345 === 12345)
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. error
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.else
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. error
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.endif
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all:
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@:;
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