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Date:      Mon, 8 Apr 2013 13:18:24 +0000
From:      Alexey Dokuchaev <danfe@FreeBSD.org>
To:        William Grzybowski <wg@FreeBSD.org>
Cc:        svn-ports-head@freebsd.org, svn-ports-all@freebsd.org, ports-committers@freebsd.org
Subject:   Re: svn commit: r315759 - head/graphics/sane-backends
Message-ID:  <20130408131824.GA88766@FreeBSD.org>
In-Reply-To: <201304081226.r38CQlZe065130@svn.freebsd.org>
References:  <201304081226.r38CQlZe065130@svn.freebsd.org>

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On Mon, Apr 08, 2013 at 12:26:47PM +0000, William Grzybowski wrote:
> New Revision: 315759
> URL: http://svnweb.freebsd.org/changeset/ports/315759
> 
> Log:
>   - Fix inverted logic for USB option
>   
> @@ -53,7 +53,7 @@ LDFLAGS+=	-L${LOCALBASE}/lib
>  .include "Makefile.man"
>  .include <bsd.port.pre.mk>
>  
> -.if ${PORT_OPTIONS:MUSB}
> +.if empty(PORT_OPTIONS:MUSB)
>  CONFIGURE_ARGS+=	--disable-libusb
>  .endif

While technically empty()-form is equivalent to !-form, the latter should
had been probably used instead, for the following reasons:

  - !-form is given as an example in PH (Example 5-12);
  - In the same PH page, in the last note, empty() is only suggested as
    alternative syntax when traditional check cannot be used for some reason;
  - empty()-form is more error prone: it's relatively easy to make mistakes
    like empty(${FOO}) vs. correct emtpy(FOO) which go unnoticed as make(1)
    does not issue any warning;
  - Let's not increase diversity in syntax; most ports use !-form.

./danfe



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