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Subject: Re: [Boost-build] Sorting include headers
From: Alexander Sack (pisymbol_at_[hidden])
Date: 2008-10-16 15:46:23

On Thu, Oct 16, 2008 at 12:34 PM, Steven Watanabe <watanabesj_at_[hidden]> wrote:
> Alexander Sack wrote:
>>> I think that this should still work. For instance if we have a
>>> bunch
>>> of includes from inherited from multiple parent projects, and these
>>> parent projects do not care about include order, if include order does
>>> matter for a specific target, we can put the parent project requirements
>>> in some random order and then treat it as if the order matters
>>> afterwards.
>> Correct.
> Alright. one more generalization:
> <free-feature-order:include> which can be either none, forward, or reverse
> none means that we don't care about order
> forward means that value "a" can override value "b", "a" should come
> after "b". (This is how cxxflags would work, I think).
> reverse is similar except that earlier values override later ones.

Yes this is what I was talking regarding a feature to control this a bit.

> Actually, (IMO) it would be better to make this a global property of the
> feature.
> There is already an "order-sensitive" attribute which is currently ignored.
> feature "include" : : free path order-sensitive-reverse ;
> It's possible that the property-set data structure can be tweaked
> so that the performance cost is small. It would have to be
> changed to something more complex than a sorted list of strings.
>>> -Id -Ic -Ib -Ia -Ie
>> YES!!!!! :D! Call me crazy but this makes A LOT more sense than what
>> is happening today. From a user stand point it states the following:
>> I want to build foo, foo needs to include d oh and any of the
>> dependencies from c and then any project hierarchical requirements
>> that maybe specified.
>> BTW, it also has the nice side effect of being able to debug how bjam
>> formulated the overall compiler invocation by just looking at it.
> Ok. This is going to be a significant amount of effort. Can you
> file a trac ticket at so it
> doesn't get lost.

Sure Steven. I've requested a Trac account so I can enter it.


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