a BSD make tool (derived from NetBSD’s make).
| cond-cmp-numeric-eq.mk (bmake-20201101) | : | cond-cmp-numeric-eq.mk (bmake-20201117) |
|---|
|
| # $NetBSD: cond-cmp-numeric-eq.mk,v 1.4 2020/10/24 08:46:08 rillig Exp $ | | # $NetBSD: cond-cmp-numeric-eq.mk,v 1.5 2020/11/08 21:47:59 rillig Exp $ |
| # | | # |
| # Tests for numeric comparisons with the == operator in .if conditions. | | # Tests for numeric comparisons with the == operator in .if conditions. |
| | |
| # This comparison yields the same result, whether numeric or character-based. | | # This comparison yields the same result, whether numeric or character-based. |
| .if 1 == 1 | | .if 1 == 1 |
| .else | | .else |
| . error | | . error |
| .endif | | .endif |
| | |
| # This comparison yields the same result, whether numeric or character-based. | | # This comparison yields the same result, whether numeric or character-based. |
| | |
| skipping to change at line 52 | | skipping to change at line 52 |
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| | |
| # As of 2020-08-23, numeric comparison is implemented as parsing both sides | | # As of 2020-08-23, numeric comparison is implemented as parsing both sides |
| # as double, and then performing a normal comparison. The range of double is | | # as double, and then performing a normal comparison. The range of double is |
| # typically 16 or 17 significant digits, therefore these two numbers seem to | | # typically 16 or 17 significant digits, therefore these two numbers seem to |
| # be equal. | | # be equal. |
| .if 1.000000000000000001 == 1.000000000000000002 | | .if 1.000000000000000001 == 1.000000000000000002 |
| .else | | .else |
| . error | | . error |
| .endif | | .endif |
| | |
|
| | # Because an IEEE 754 double can only hold integers with a mantissa of 53 |
| | # bits, these two numbers are considered the same. The 993 is rounded down |
| | # to the 992. |
| | .if 9007199254740993 == 9007199254740992 |
| | .else |
| | . error |
| | .endif |
| | # The 995 is rounded up, the 997 is rounded down. |
| | .if 9007199254740995 == 9007199254740997 |
| | .else |
| | . error Probably a misconfiguration in the floating point environment, \ |
| | or maybe a machine without IEEE 754 floating point support. |
| | .endif |
| | |
| # There is no = operator for numbers. | | # There is no = operator for numbers. |
| .if !(12345 = 12345) | | .if !(12345 = 12345) |
| . error | | . error |
| .else | | .else |
| . error | | . error |
| .endif | | .endif |
| | |
| # There is no === operator for numbers either. | | # There is no === operator for numbers either. |
| .if !(12345 === 12345) | | .if !(12345 === 12345) |
| . error | | . error |
| | | |
| End of changes. 2 change blocks. |
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| 1 lines changed or deleted | | 15 lines changed or added |
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