Re: svn commit: r48261 - head/en_US.ISO8859-1/books/porters-handbook/makefiles

On 27/02/2016 2:30 AM, Mathieu Arnold wrote:
> Author: mat
> Date: Fri Feb 26 15:30:23 2016
> New Revision: 48261
> URL: https://svnweb.freebsd.org/changeset/doc/48261
> 
> Log:
>   Add a tip about opt_VARS and whitespace.
>   
>   Reviewed by:	wblock
>   Sponsored by:	Absolight
>   Differential Revision:	https://reviews.freebsd.org/D5447
> 
> Modified:
>   head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
> 
> Modified: head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml
> ==============================================================================
> --- head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml	Fri Feb 26 10:34:51 2016	(r48260)
> +++ head/en_US.ISO8859-1/books/porters-handbook/makefiles/chapter.xml	Fri Feb 26 15:30:23 2016	(r48261)
> @@ -4487,6 +4487,22 @@ BIN3_BUILD=	yes
>  .else
>  BIN3_BUILD=	no
>  .endif</programlisting>
> +
> +	<tip>
> +	  <para>Values containing whitespace must be enclosed in
> +	    quotes:</para>
> +
> +	  <programlisting>OPT_VARS=	foo="bar baz"</programlisting>
> +
> +	  <para>This is due to the way &man.make.1; variable expansion
> +	    deals with whitespace.  When <literal>OPT_VARS= foo=bar
> +	      baz</literal> is expanded, the variable ends up
> +	    containing two strings, <literal>foo=bar</literal> and
> +	    <literal>baz</literal>.  But the submitter probably
> +	    intended there to be only one string, <literal>foo=bar
> +	      baz</literal>.  Quoting the value prevents whitespace
> +	    from being used as a delimiter.</para>
> +	</tip>
>        </sect3>
>  

Thank you Mathieu!
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