Hi,

Is there a way to get cmake 3.11 to emit 17 vs 1y when setting 
CMAKE_CXX_STANDARD?  I’m finding that it seems to be a common practice to use 
the value of the preprocessor define __cplusplus (which is a date), and the 
value differs depending on whether 17 or 1y is used (at least with CLang).  I 
haven’t figured out how to get cmake to emit -std=c++17, it always seems to use 
1y, which is causing problems with code that assumes the __cplusplus date 
reflects the c++17 standardization date.

Thanks,
   Andrew

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