Author jkloth
Recipients db3l, jeremy.kloth, jkloth, miss-islington, pablogsal, paul.moore, steve.dower, tim.golden, vstinner, zach.ware
Date 2018-12-11.01:31:22
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A quick look at the good build log does indicate that the 8.1 SDK was being used (vars UseWindows81SDK=true and WindowsTargetPlatformVersion=8.1) which is the default behavior for VS2015 if a matching (from python.props) Win10SDK cannot be found.

It seems that the build tools you have installed do not give an error when the selected SDK (WindowsTargetPlatformVersion) isn't found on the system.

You've said that you have the Build Tools for VS2015 installed, a quick look at the download date indicates that they were released prior to VS2015 Update 1 (which includes 10.0.10586.0).
Date User Action Args
2018-12-11 01:31:22jklothsetrecipients: + jkloth, paul.moore, db3l, vstinner, tim.golden, jeremy.kloth, zach.ware, steve.dower, pablogsal, miss-islington
2018-12-11 01:31:22jklothsetmessageid: <>
2018-12-11 01:31:22jklothlinkissue35433 messages
2018-12-11 01:31:22jklothcreate