why :: in ports makefile ?

Jason Helfman jhelfman at e-e.com
Fri Mar 23 14:38:04 UTC 2012

> I have never seen this before, and I wanted to know what it does.
> diff -ruN /tmp/p5-Mail-SpamAssassin.org/Makefile
> /tmp/p5-Mail-SpamAssassin/Makefile
> --- /tmp/p5-Mail-SpamAssassin.org/Makefile	2012-02-08 00:17:28.000000000
> +0900
> +++ /tmp/p5-Mail-SpamAssassin/Makefile	2012-03-06 08:55:28.445163638 +0900
> @@ -219,7 +219,7 @@
>   .endif
>   	@${INSTALL_DATA} ${WRKSRC}/spamc/libspamc.h ${PREFIX}/include
> -post-install:
> +post-install::
>   .if defined (WITH_SPAMC)
>   	@${STRIP_CMD} ${PREFIX}/bin/spamc
>   .endif
> (this patch was sent to me by the maintainer of ja-p5-Mail-SpamAssassin.
> I suggested that he change his port to a slave port so that it would be
> easier to follow, and he has done a good job.
> I just wanted to know what the differences are in the port Makefile
> between a ':' and a '::'
> Does this have to do with slave port(ish) things? does this force it to
> execute?  what is it?
> Pardon my ignorance, I have just never seen this before in any port I have
> maintained, or worked on.
> (reference this PR for context)
> <http://www.freebsd.org/cgi/query-pr.cgi?pr=165765>

from make manapage

     ::    If no sources are specified, the target is always re-created.  
Otherwise, a target is considered out-of-date if any of its sources	 
 has been modified more recently than the target.  Sources for a
target do not accumulate over dependency lines when this operator is
used.  The target will not be removed if make is interrupted.

This is typically used in ports for pre-everything target, but have never
seen it on post-install. I don't see why the :: is necessary, either, as
':' should do in this case.


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