@MarkO For a quick fix as you described, I probably would have done the same thing. However, it sounds like a Band-Aid, as opposed to a "robust" solution long-term. Not trying to argue; just trying to understand this particular bit of the C language. But it sounds like, if time weren't an issue, that rewriting the #defines to make them "correct" for the high and low used products would be better -- if time permitted.
But I think Gary had a good point. I am a big proponent of nested #includes myself, too. This could be a really good reason for #undef.
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