To summarize, sth along the lines of
“C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat” x64
or
“C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\Common7\Tools\vsdevcmd” -arch=x64
(try running it with -help)
My environment:
** Visual Studio 2017 Developer Command Prompt v15.0.26403.7
on Win10 x64