pitrou commented on PR #49922:
URL: https://github.com/apache/arrow/pull/49922#issuecomment-4386869638

   I think we should both 1) fix xsimd upstream anyway and 2) pass 
`/Zc:__cplusplus` when building Arrow C++.
   
   It seems xsimd should do something like this:
   ```c++
   #ifdef _MSVC_LANG
   #define XSIMD_CPP_LEVEL _MSVC_LANG
   #else
   #define XSIMD_CPP_LEVEL __cplusplus
   #endif
   ```
   
   and then use the `XSIMD_CPP_LEVEL` macro everywhere instead of `__cplusplus`.
   
   


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