a BSD make tool (derived from NetBSD’s make).
| cond-cmp-unary.mk (bmake-20201101) | : | cond-cmp-unary.mk (bmake-20201117) |
|---|
|
| # $NetBSD: cond-cmp-unary.mk,v 1.1 2020/09/14 06:22:59 rillig Exp $ | | # $NetBSD: cond-cmp-unary.mk,v 1.2 2020/11/11 07:30:11 rillig Exp $ |
| # | | # |
| # Tests for unary comparisons in .if conditions, that is, comparisons with | | # Tests for unary comparisons in .if conditions, that is, comparisons with |
| # a single operand. If the operand is a number, it is compared to zero, | | # a single operand. If the operand is a number, it is compared to zero, |
| # if it is a string, it is tested for emptiness. | | # if it is a string, it is tested for emptiness. |
| | |
| # The number 0 evaluates to false. | | # The number 0 evaluates to false. |
| .if 0 | | .if 0 |
| . error | | . error |
| .endif | | .endif |
| | |
| | |
| skipping to change at line 28 | | skipping to change at line 28 |
|---|
| .if "" | | .if "" |
| . error | | . error |
| .endif | | .endif |
| | |
| # Any other string evaluates to true. | | # Any other string evaluates to true. |
| .if !"0" | | .if !"0" |
| . error | | . error |
| .endif | | .endif |
| | |
| # The empty string may come from a variable expression. | | # The empty string may come from a variable expression. |
|
| | # |
| | # XXX: As of 2020-11-11, this empty string is interpreted "as a number" in |
| | # EvalNotEmpty, which is plain wrong. The bug is in TryParseNumber. |
| .if ${:U} | | .if ${:U} |
| . error | | . error |
| .endif | | .endif |
| | |
| # A variable expression that is not surrounded by quotes is interpreted | | # A variable expression that is not surrounded by quotes is interpreted |
| # as a number if possible, otherwise as a string. | | # as a number if possible, otherwise as a string. |
| .if ${:U0} | | .if ${:U0} |
| . error | | . error |
| .endif | | .endif |
| | |
| # A non-zero number from a variable expression evaluates to true. | | # A non-zero number from a variable expression evaluates to true. |
| .if !${:U12345} | | .if !${:U12345} |
| . error | | . error |
| .endif | | .endif |
| | |
|
| | # A string of whitespace should evaluate to false. |
| | # |
| | # XXX: As of 2020-11-11, the implementation in EvalNotEmpty does not skip |
| | # whitespace before testing for the end. This was probably an oversight in |
| | # a commit from 1992-04-15 saying "A variable is empty when it just contains |
| | # spaces". |
| | .if ${:U } |
| | . info This is only reached because of a bug in EvalNotEmpty. |
| | .else |
| | . error |
| | .endif |
| | |
| all: # nothing | | all: # nothing |
| | | |
| End of changes. 3 change blocks. |
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| 1 lines changed or deleted | | 16 lines changed or added |
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