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From: Pedro Ferreira (pedro.ferreira_at_[hidden])
Date: 2004-12-15 04:59:38

Em 14 Dec 2004, às 11:28, Vladimir Prus escreveu:

> Hi Pedro,
>> 1. Initially, bjam will invoke SCons at the lowest level (creating
>> SCons Nodes instead of bjam's targets).
> ........
>> My first feeling was that it was indeed the best way to proceed and I
>> implemented a prototype of 1.:
>> 1. change build-system.jam to dump a Python map of all virtual-targets
>> and their relevant properties
>> 2. create a Python script that reads the map an creates the
>> appropriate
>> SCons nodes
>> 3. map BB properties into SCons environment settings
>> This works fine when using simple properties, such as <define>,
>> <include> and <linkflags>, which are readily supported by SCons
>> enviroments.
>> But, in order to map things like <optimization> or <debug-symbols>,
>> you
>> need to know which compiler you are using.
>> And, there must be a mapping between BB target type and the
>> appropriate
>> Environment method to call in order to create a target. And you must
>> choose env.StaticObject or env.SharedObject depending on the target
>> being a DLL or a LIB.
> I'd expect that we create very low-level SCons representation, where
> each Node
> represent a file, and actions and variables are computed by
> Boost.Build. That
> is, the settings that toolset.set-target-variables is passed over to
> SCons
> together with the command lines used by toolsets.
> Why have another feature->variable translation if the existing one
> works?

Sure. And that was the goal we had set initially. I just started
experimenting to see where we had to go afterwards.

>> So, I got to the conclusion that we would be better off moving
>> directly
>> to Python.
> It might be less terrible thing that it sounds, due to large number of
> tests
> V2 has, but still will take unpredictable time. Of course, if somebody
> can do
> it over weekend, that would be great.

:-) Not over a weekend but it's my firm belief that we'll get good
feedback soon after we start.




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