[Scons-users] CPPDEFINES Unexpected Behavior

[Strand, Kyle J]

I've discovered some really surprising and probably incorrect behavior with the environment's CPPDEFINES variable. According to the manpage,

"If $CPPDEFINES is a dictionary, the values of the $CPPDEFPREFIXand$CPPDEFSUFFIX construction variables will be appended to the beginning and end of each item from the dictionary. The key of each dictionary item is a name being defined to the dictionary item's corresponding value; if the value is None, then the name is defined without an explicit value."

This leads me to expect that if I use env.AppendUnique() with a dictionary argument, if any of the values in that dictionary are None, then the corresponding keys will be defined without an explicit value. However, this is not what happens. The following code:

env = Environment()
newdefs = {'def1':None}
env.AppendUnique(CPPDEFINES=newdefs)

causes 'def1' to be defined as the literal string 'None.'

Is this the desired behavior? If so, why? If not, I'll submit a bug report.

________________________________
Kyle Strand, Software Intern
Beckman Coulter, Inc., Life Sciences Division
4862 Innovation Drive, Fort Collins, Colorado, 80525
(970) 204-7036


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