Builds with CUDA 9.1/NSight fail with VS 2017 version 15.5.6

The file host_config.h at: C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v9.1\include\crt includes the line

#if _MSC_VER < 1600 || _MSC_VER > 1911

But for Visual Studio 2017 v15.5.6 _MSC_VER has the value 1912, matching the related compiler version:

Microsoft ® C/C++ Optimizing Compiler Version 19.12.25835 for x64

A temporary change in host_config.h to refer to 1912 did NOT result in a successful build so there would appear to be other incompatibilities as well.

Yep, VS 2017 releases >= 15.5 do not work with CUDA toolkit 9.1, one has to use a VS 2017 release <= 15.4 .
See https://devtalk.nvidia.com/default/topic/1027299/cuda-setup-and-installation/cuda-9-failed-to-support-the-latest-visual-studio-2017-version-15-5/2