34 lines
756 B
Makefile
34 lines
756 B
Makefile
# $NetBSD: directive-ifdef.mk,v 1.4 2021/01/21 23:03:41 rillig Exp $
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#
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# Tests for the .ifdef directive.
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# TODO: Implementation
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DEFINED= defined
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# It looks redundant to have a call to defined() in an .ifdef, but it's
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# possible. The .ifdef only affects plain symbols, not function calls.
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.ifdef defined(DEFINED)
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. info Function calls in .ifdef are possible.
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.else
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. error
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.endif
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# String literals are handled the same in all variants of the .if directive.
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# They evaluate to true if they are not empty. Whitespace counts as non-empty
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# as well.
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.ifdef ""
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. error
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.else
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. info String literals are tested for emptiness.
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.endif
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.ifdef " "
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. info String literals are tested for emptiness. Whitespace is non-empty.
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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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