port variants

Kevin Oberman kob6558 at gmail.com
Fri Apr 13 22:38:13 UTC 2012


2012/4/13 Konstantin Tokarev <annulen at yandex.ru>:
>
>
> 13.04.2012, 23:55, "Chris Inacio" <nacho319 at gmail.com>:
>> On Apr 13, 2012, at 3:39 PM, Freddie Cash <fjwcash at gmail.com> wrote:
>>
>>>  On Fri, Apr 13, 2012 at 12:04 PM, Chris Inacio <nacho319 at gmail.com> wrote:
>>>>  I was recently asked to do some FreeBSD ports support work.  I mostly use a
>>>>  Mac and the MacPorts system.  MacPorts has the concept of a variant for a
>>>>  port, but I can't find the analogue in the FreeBSD system.
>>>>
>>>>  Does the FreeBSD ports system have the concept of a variant?  If so, can
>>>>  someone point me in the right direction on how to create one?
>>>  Describing what a "variant" is, how it works in MacPorts, and what you
>>>  are trying to do would help a lot.  :)
>>>
>>>  The closest guess I could make would be "slave port", but I don't
>>>  think that works the same way.
>>
>> Sorry, you're right.
>>
>> For example, a port of say Emacs could have a variant of X11.
>>
>> So Emacs or Emacs+X11.
>>
>> The X11 variant would (somewhat obviously) include building regular Emacs but also the X11 toolbar etc. while Emacs wouldn't include any X11 features (& dependencies).
>>
>> On the Mac, we can build universal binaries (PowerPC, ia32, and x86_64), at the cost of disk space. So we can build almost any package with the +universal variant.
>>
>> Is that a reasonable explanation?
>
> Seems like you need makefile options:
>
> http://www.freebsd.org/doc/en/books/porters-handbook/makefile-options.html

While I think makefile-options is the way to go, I should also point
out that for the specific case of emacs and X11, it is not used due to
the very large differences. Other "variants" are handled via options,
but there are separate emacs and emacs-nox11 ports.

Most obviously, all of the emacs options are X11 related and there is
no way that I know to have two sets of options with one list dependent
on the other. If there are only a coupe of cases of this, it may be
noted on the options like:
THREADS       " Build with thread support"
            On \
FOO                "Foo support (requires THREADS)"
         OFF \

The port maintainer/developer has to make a call as to which approach
is more practical, but I suspect portmgr@ will press for maximum use
of makefile-options.
-- 
R. Kevin Oberman, Network Engineer
E-mail: kob6558 at gmail.com


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