Date: Thu, 31 Jul 2003 00:27:44 +0300 From: Ruslan Ermilov <ru@FreeBSD.ORG> To: Juli Mallett <jmallett@FreeBSD.ORG> Cc: current@FreeBSD.ORG Subject: Re: make -U Message-ID: <20030730212744.GJ33188@sunbay.com> In-Reply-To: <20030730162320.A66578@FreeBSD.org> References: <20030730212049.GI33188@sunbay.com> <20030730162320.A66578@FreeBSD.org>
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On Wed, Jul 30, 2003 at 04:23:20PM -0500, Juli Mallett wrote:
> * Ruslan Ermilov <ru@FreeBSD.org> [ Date: 2003-07-30 ]
> [ w.r.t. make -U ]
> > Sorry, I've accidentally dropped an email about `make -U'.
> >
> > I think that it's not needed, since the functionality can
> > easily be achieved by running "make FOO=", i.e., assigning
> > an empty value. Remember that command line variables take
> > precedence over globals, so the following makefile,
> >
> > FOO+= bar
> >
> > all:
> > @echo ${FOO}
> >
> > when run as ``make FOO=foo'', will print just ``foo''.
>
> Does that work for the .if defined() case, too? Makefiles can grow
> to be more complex than just that sort of stuff, after all :)
>
Not sure what do you mean. The "make -U FOO" was support to
undefine the FOO variable, as it the ``.undef FOO'' was called
at the end of makefile. Of course, setting FOO= on a command
line still gets you a "defined" variable, but
.if defined(FOO) && !empty(FOO)
should do the trick. Try this out with "make FOO=":
FOO= bar
all:
.if defined(FOO) && !empty(FOO)
@echo FOO is set
.endif
Cheers,
--
Ruslan Ermilov Sysadmin and DBA,
ru@sunbay.com Sunbay Software Ltd,
ru@FreeBSD.org FreeBSD committer
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