Here's how you can debug a lengthy #define. You will need to know a full object build string in your build tool (VERBOSE=1 make if you're using cmake), and install GNU indent.

Then:

cc -E file.c | grep -v '^#' | indent > out
mv out file.c
make # rebuild your project with the new file

Now it's easy to see what part of a macro is causing the

I'm happy it turned out to be that simple, but the amount of such bugs and devastating consequences are humiliating.
Bug#7209 is a case of an intermittent failure when the best brain of Support department and dozens of man hours had to be spent to track the issue down to a repeatable test case. And the cause is such a trivial design mistake:
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