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VS2017: Verify Windows 8.1 SDK before using it
The detection logic added by commit v3.8.0-rc2~14^2 (VS2017: If Win 8.1 SDK is not available, use Win 10 SDK, 2017-02-20) was incomplete. It is possible for the Win 8.1 SDK registry entry to exist, and even the directory, but the header files to not actually be installed. Teach `cmGlobalVisualStudio15Generator::IsWin81SDKInstalled` to verify that the `windows.h` header actually exists in the SDK directory. We do this in `cmGlobalVisualStudio14Generator::GetWindows10SDKVersion` for the Windows 10 SDK already. Fixes: #16811
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@@ -164,7 +164,7 @@ bool cmGlobalVisualStudio15Generator::IsWin81SDKInstalled() const
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"HKEY_CURRENT_USER\\SOFTWARE\\Microsoft\\"
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"Windows Kits\\Installed Roots;KitsRoot81",
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win81Root, cmSystemTools::KeyWOW64_32)) {
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return true;
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return cmSystemTools::FileExists(win81Root + "/um/windows.h", true);
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}
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return false;
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}
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