Date: Thu, 25 Aug 2005 23:53:03 -0600 (MDT) From: "M. Warner Losh" <imp@bsdimp.com> To: keramida@freebsd.org Cc: Emanuel.strobl@gmx.net, freebsd-current@freebsd.org, dpk@dpk.net, freebsd-questions@freebsd.org Subject: Re: make ".if exists" problem/question Message-ID: <20050825.235303.66274316.imp@bsdimp.com> In-Reply-To: <20050825184614.GA97117@orion.daedalusnetworks.priv> References: <35c231bf05082511101884faf@mail.gmail.com> <200508252037.04779@harrymail> <20050825184614.GA97117@orion.daedalusnetworks.priv>
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Yes. The thing to keep in mind is that much of the .if stuff is done at parsing or rule construction time. So if you change something (creating a file, say), then that condition won't be re-evaluated. For the specific example given, one could replace much of the goo with: target: foobar foobar: touch foobar if you wanted to create foobar. Otherwise, I'd be tempted not to use .if exists. I'd be tempted to do something more like: target: @-if [ -f foobar ]; then cat foobar; else touch foobar; fi where you have the shell check. The primary use of exists() I've seen is: .if exists(foo.mk) .include "foo.mk" .endif although I have seen others. Warner
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