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Date:      Thu, 5 Feb 2015 17:26:08 -0800
From:      "Simon J. Gerraty" <sjg@juniper.net>
To:        NGie Cooper <yaneurabeya@gmail.com>
Cc:        "freebsd-arch@freebsd.org" <arch@freebsd.org>
Subject:   Re: Better way to do conditional inclusion in make
Message-ID:  <5180.1423185968@chaos>
In-Reply-To: <CAGHfRMAdOTUQZvU5D_1KYEyZdoaD4RJ2BTTOgUjrm3sK31U0kw@mail.gmail.com>
References:  <39C20BA1-E6B1-4DAE-95BB-8011A0A64D54@bsdimp.com> <54D40DC4.9070907@freebsd.org> <CAGHfRMAdOTUQZvU5D_1KYEyZdoaD4RJ2BTTOgUjrm3sK31U0kw@mail.gmail.com>

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NGie Cooper <yaneurabeya@gmail.com> wrote:
> > how does it cope with the case where a single file is dependent on either of
> > two options.
> > (we have this in our tree.. not sure if it occurs in the FreeBSD tree.)
> > file could occur in both lists or twice in one list..
> 
> This is a good, valid point. I think that Warner's proposal will fix
> the simple case (using one knob), but not the more complex case.

FILES:= ${FILES:O:u}

should cover that case.

> What concerns me about the short description of the implementation,
> (and something that I'm going to add to the phabricator review) is
> that this will:
> 
> 1. Break using FILESGROUPS

Why?

> 2. Requires creating snippets for dealing with magic in bsd.*.mk (I
> wouldn't want this magic going into the general purpose snippets
> because it would probably break backwards compatibility).

Not necessarily eg. if you clean/simplify the list after building it.



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