[Scons-users] Overriding Object to force global dependency

[Greg Ward]

On 05 July 2012, Gary Oberbrunner said:

> The standard SharedObjectEmitter does this (see Defaults.py):

> 

> def SharedObjectEmitter(target, source, env):

>     for tgt in target:

>         tgt.attributes.shared = 1

>     return (target, source)

> 

> and unfortunately I believe add_emitter is replacing the standard

> emitter with yours.  (See Builder.py).  Maybe for now just set

> tgt.attributes.shared=1 in your shared emitter.


Ahhhh. Emitters don't stack. Got it. If my time machine were working,
I'd hop back and ask someone to change add_emitter() to set_emitter().

Luckily, I can stack emitters myself manually. Here's how I did it:

  def lbe_emitter(target, source, env):
      env.Depends(target, '#dummy-lbe')
      return (target, source)
  
  def stack_lbe_emitter(builder, suffix):
      orig_emitter = builder.emitter.get(suffix)
      if orig_emitter:
          def emitter(target, source, env):
              (target, source) = orig_emitter(target, source, env)
              (target, source) = lbe_emitter(target, source, env)
              return (target, source)
      else:
          emitter = lbe_emitter
      builder.add_emitter(suffix, emitter)
  
  stack_lbe_emitter(env['BUILDERS']['StaticObject'], '.cpp')
  stack_lbe_emitter(env['BUILDERS']['SharedObject'], '.cpp')

Seems to work. Should not be too hard to generalize if someone needs to.

Thanks!

       Greg