Greetings, I'm making fairly good headway on this but I think I've found something which may be hard to work around.
When creating the action signature in some cases it will use pickle to serialize the object. (Functions, class instances,etc) In those cases the pickled contents are different between python 2 and python3. This means that any build swapping between 2 and 3 would likely run into extraneous actions (builders) being run. (When in fact nothing has changed) Additionally I found one assumption in the code to create signatures from functions which is not correct. (That the first item in list of constants is always the docstring, it is not if there is no docstring). Thoughts? Clearly the py3/2 version of SCons will be a major version release (3.0). -Bill
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