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