seberg commented on PR #40418:
URL: https://github.com/apache/arrow/pull/40418#issuecomment-1990985419

   I suspect the warning refers to this line (a thing that confuses me is that 
the warning seems to point at some random line):
   ```
           PyArrayIterObject    *iters[];
   ```
   which C++ doesn't love (I hadn't thought of that).  I guess clang/gcc don't 
warn about it?  Would be nice to hide it somehow, but it doesn't seem worrying 
here.
   
   But, that doesn't actually help me understand why it fails to find the 
definitions :(, the files in the installed wheels look good after all.  And at 
least a minimal try with godbold doesn't hate the `npy_2_compat.h` content on 
MSVC C++.
   
   So maybe something is off on MSVC (I think SciPy may be using clang on 
windows so wouldn't notice)?  But I can't think of what.


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