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 12:56:16

[2002-12-23] David Abrahams wrote:

>Rene Rivera <grafik666_at_[hidden]> writes:
>
>> [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 ;-)
>
>IMO a cleaner possibility would be to have UPDATE *reset* the targets
>which need update and return its previous state.
>
>rule add-update ( targets * )
>{
> targets += [ UPDATE ] ;
> UPDATE $(targets) ;
>}

OK, I can live with that. But that requires a few more changes in *.jam
files in various places :-( Oh well.

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