[Scons-users] CPPDEFINES Unexpected Behavior

[Dirk Bächle]

Hi all,

On 11.04.2013 17:27, Managan, Rob wrote:

> I have a quick fix for the case

> Env.AppendUnique(CPPDEFINES={'test1':3, 'test2':None})

>


I looked at the code a bit more and the behaviour reported by Kyle is 
not a bug, it's correct!

The point here is, that the "$CPPDEFINES" get expanded and used only 
when "$_CCCOMCOM" is substituted during an actual compile.
For the given example this can be enforced by:

   env = Environment()
   newdefs = {'def1' : None}
   env.AppendUnique(CPPDEFINES=newdefs)
   print env.subst('$_CPPDEFFLAGS')

which results in the correct output:

   -Ddef1

It's simply the difference between setting "$CPPDEFINES", and actually 
expanding it. This also explains why Evan reported that he never seemed 
to have any problems while using this feature.

@Kyle: Please check and confirm this on your side, I'd then close the 
bug as INVALID.


Best regards,

Dirk

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