Re: [Boost-build] dtrace success

From: Vladimir Prus (ghost_at_[hidden])
Date: 2008-04-02 00:40:43

On Wednesday 02 April 2008 04:14:24 Khassapov, Alex wrote:
> Thanks to Volodya, I have dtrace generator working!

Ah, I see you've solved the duplicate target issue by explicitly
creating objs and then passing them on EXE generator.
I was going to sketch some code to make that unnecessary, but that was
going to be hacking for the time being.

> The generator produces an executable modified by dtrace.  Now I realised
> that we also need a dtrace library generator.  I could simply copy and
> modify the code from dtarce.jam (attached), but I wonder how to do it
> properly (bjam way)?

Well, I don't think "proper" way here is anyway different than in any language.
I think you can extract most of the code into a separate function, and then
the body of the 'run' method will be just:

  return [ generators.construct $(project) $(name) 
           : EXE : $(property-set) : $(.libs) 
           [ process-objs ..... ] ] ;

and the lib generator would do the same. In fact, to make things even less
copy-pasted:

1. Define the generators __init__ rule as:

    rule __init__ ( * : * )
    {
        generator.__init__ $(1) : $(2) : $(3) ;
        self.supertype = $(4)  ;
    }

2. Instead of hardcoding EXE, use

    $(self.supertype)

3. Declare two generators like:

        generators.register [ new dtrace-binary-generator dtrace.binary : : EXE : DTRACE_EXE ] ;
        generators.register [ new dtrace-binary-generator dtrace.binary : : LIB : DTRACE_LIB ] ;

But I think that starting with two generators, and a common function extracted from current
'run' method should be fine.

- Volodya