Re: [Boost-build] prototyping alternative Boost.Build syntax

Subject: Re: [Boost-build] prototyping alternative Boost.Build syntax
From: Stefan Seefeld (stefan_at_[hidden])
Date: 2016-11-03 11:06:57

On 03.11.2016 10:59, Steven Watanabe wrote:
> AMDG
>
> On 11/03/2016 08:38 AM, Stefan Seefeld wrote:
>> On 29.10.2016 16:50, Steven Watanabe wrote:
>>>> * can a target be something other than a file, perhaps with no
>>>> filesystem representation at all ?
>>>>
>>> Yes.  NOTFILE marks a target as not
>>> referring to a real file.
>> In what way does bjam/b2 handle NOTFILE targets differently from other
>> targets ?
>   NOTFILE targets are updated when their
> dependencies are updated.  b2 doesn't attempt
> to bind them to a real file nor check
> the timestamp.
>
>> And what other target types (or attributes) exist ?
>> How can I instantiate / declare targets using these non-default
>> attributes using the bjam Python API (or the C API, if there isn't any
>> Python binding for it yet) ?
>
> https://github.com/boostorg/build/blob/develop/src/engine/rules.h#L140
>
> http://www.boost.org/build/doc/html/jam/language.html#jam.language.rules.builtins.modifying_binding

What is the corresponding C API function for this ?
>>>> * The bjam.define_action() function takes a list and an int as third and
>>>> fourth argument. What are these used for ?
>>>>
>>>   The list is a list of variable names.
>>> The variable names should be a list of
>>> targets which will be translated from
>>> the target name to the filesystem path.
>>>
>>> Example:
>>>
>>> actions link bind LIBRARIES {
>>>   g++ $(>) -o $(<) $(LIBRARIES)
>>> }
>>>
>>> LIBRARIES = <pbin>lib.a ;
>>> SEARCH on <pbin>lib.a = ./bin ;
>>>
>>> Then in the body of link, $(LIBRARIES) will
>>> expand to ./bin/lib.a.
>> Again, in the C (or Python) API, where are these variables defined so
>> that they can be properly substituted if requested by the
>> bjam.define_action() call ?
>>
>   on TARGET variables (such as SEARCH) can
> be set using set-target-variable, defined
> in kernel/bootstrap.jam.

Again, I'm actually looking for the C API equivalent of these (given
that I'm interfacing with the engine using Python rather than Jam).

Thanks,
        Stefan

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