1# $NetBSD: directive-ifndef.mk,v 1.6 2020/10/24 08:46:08 rillig Exp $ 2# 3# Tests for the .ifndef directive, which can be used for multiple-inclusion 4# guards. In contrast to C, where #ifndef and #define nicely line up the 5# macro name, there is no such syntax in make. Therefore, it is more 6# common to use .if !defined(GUARD) instead. 7 8.ifndef GUARD 9GUARD= # defined 10. info guarded section 11.endif 12 13.ifndef GUARD 14GUARD= # defined 15. info guarded section 16.endif 17 18.if !defined(GUARD) 19GUARD= # defined 20. info guarded section 21.endif 22 23all: 24 @:; 25