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1b65f0bd2b
o allow env var MAKE_OBJDIR_CHECK_WRITABLE=no to skip writable checks in InitObjdir. Explicit .OBJDIR target always allows read-only directory. o Fix building and unit-tests on non-BSD. o More code cleanup and refactoring. o More unit tests
60 lines
1.1 KiB
Makefile
60 lines
1.1 KiB
Makefile
# $NetBSD: cond-op-not.mk,v 1.6 2020/11/15 14:58:14 rillig Exp $
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#
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# Tests for the ! operator in .if conditions, which negates its argument.
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# The exclamation mark negates its operand.
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.if !1
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. error
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.endif
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# Exclamation marks can be chained.
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# This doesn't happen in practice though.
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.if !!!1
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. error
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.endif
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# The ! binds more tightly than the &&.
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.if !!0 && 1
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. error
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.endif
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# The operator '==' binds more tightly than '!'.
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# This is unusual since most other programming languages define the precedence
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# to be the other way round.
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.if !${:Uexpression} == "expression"
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. error
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.endif
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.if !${:U}
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. info Not empty evaluates to true.
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.else
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. info Not empty evaluates to false.
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.endif
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.if !${:U }
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. info Not space evaluates to true.
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.else
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. info Not space evaluates to false.
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.endif
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.if !${:U0}
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. info Not 0 evaluates to true.
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.else
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. info Not 0 evaluates to false.
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.endif
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.if !${:U1}
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. info Not 1 evaluates to true.
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.else
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. info Not 1 evaluates to false.
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.endif
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.if !${:Uword}
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. info Not word evaluates to true.
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.else
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. info Not word evaluates to false.
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.endif
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all:
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@:;
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