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> Macros should be written so as to depend as little as possible on the execution environment to produce a correct expansion. To ensure consistent behavior, it is best to ensure that all macro definitions are available, whether to the interpreter or compiler, before any code containing calls to those macros is introduced.

- Common Lisp the Language, http://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/html/c...

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That was also the most relevant snippet I found while searching. :) Unfortunately, I couldn't quite figure out if it was a confirmation of my claim or a rebuttal. Would you mind clarifying?

I know about as much as you do. I did some googling, and maybe it's because I'm sitting at pitt.edu, but cmu.edu seems authoritative. ;)

To me, this paragraph says "using a macro before it's defined is undefined behavior," and seems to back up your assertion.

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