Limitations of Ports System

[Aryeh M. Friedman]

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RW wrote:
> On Thu, 13 Dec 2007 22:34:58 -0500 "Aryeh M. Friedman"
> <aryeh.friedman at gmail.com> wrote:
>
>> Namely if I build abc with options 123 and 345 and def with 345
>> and 678 then 345 will be cached for def since we already set it
>> for abc.
>
> How do you know the user wants 345 set on both ports?
>
> It might be a useful stable feature on "abc", but causes lock-ups
> on "def"

There are multiple ways to handle the effects of 345 on def... only
one of them is to automatically apply it the other two are def can
ignore it by default or make it suer settable
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