1# $NetBSD: directive-ifdef.mk,v 1.4 2021/01/21 23:03:41 rillig Exp $ 2# 3# Tests for the .ifdef directive. 4 5# TODO: Implementation 6 7DEFINED= defined 8 9# It looks redundant to have a call to defined() in an .ifdef, but it's 10# possible. The .ifdef only affects plain symbols, not function calls. 11.ifdef defined(DEFINED) 12. info Function calls in .ifdef are possible. 13.else 14. error 15.endif 16 17# String literals are handled the same in all variants of the .if directive. 18# They evaluate to true if they are not empty. Whitespace counts as non-empty 19# as well. 20.ifdef "" 21. error 22.else 23. info String literals are tested for emptiness. 24.endif 25 26.ifdef " " 27. info String literals are tested for emptiness. Whitespace is non-empty. 28.else 29. error 30.endif 31 32all: 33 @:; 34