Re: [jamboost] UPDATE compatability (WAS: Jam Tutorial example doesn't work with Boost's Jam)

From: Rene Rivera (grafik666_at_[hidden])
Date: 2002-12-23 12:36:16

[2002-12-23] David Abrahams wrote:

>Rene Rivera <grafik666_at_[hidden]> writes:
>>
>> OK, I looked a bit at the code and here's a solution...
>>
>> 1. Bring back the Jam/MR code to add the command line targets for update
>> automatically.
>>
>> 2. Change the UPDATE builtin to work like so:
>>
>> UPDATE some_targets ; ## marks the given targets for update
>> 
>> UPDATE ; ## removes all targets from the update list
>
>Hmm. It's minimalist, but I think it's relatively un-Jam-like to work
>that way. Suppose you have a variable that turns out to be empty?
>
> UPDATE $(targets) ;
>
>I'm not too worried, though; if you can't think of a better design I
>think this is acceptable.

There is another alternative I thought about that is not as minimalist:

UPDATE targets * : action ? ;

## action = MARK | CLEAR - default is MARK

UPDATE a b c ; ## marks a b c for update
UPDATE a b : CLEAR ; ## clears/unmarks a b from update list
UPDATE : CLEAR ; ## clears all targets from update list

This is a bit more work to implement but it is more flexible ;-)

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