I have the 2.7 bison and the 2.5.35 which are the same as you have and yet I do 
not get the warnings. I do have a different gcc -- 4.7, but I'm not really sure 
how to downgrade it to 4.2 which is what you have -- "gcc version 4.2.1 (Based 
on Apple Inc. build 5658) (LLVM build 2336.11.00)". And that seems to be a 
customized Mac gcc anyway. It is really weird they've bothered to update their 
Bison to 2.7 when no one else did, yet they're stuck with a 6-years old GCC. 

I did not say you should fix them, I asked if you could. That's because you're 
the only one getting them. The locations are correct relative to the generated 
.l files (e.g. build/src/compiler/parser/jsoniq_scanner.l). It is not difficult 
to trace back the line in the scanner.l file. 
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