Re: Compile from source using latest Microsoft Windows SDK

> For VS2017, the 8.1 SDK is part of the optional package set
Yeah, if you install 8.1 SDK VS2017 can compile. I install VS2017 using the
GUI installer.
The main page are big checkboxs for packages sets like C++, .NET, Azure etc.
Checking C++ will only install the IDE and 10 SDK. 8.1 SDK is on the side
panel detailed list.

>but it's really only a major issue for VS2019
VS2019 will use the latest v10 SDK by default. So no need to install 8.1
for VS2019.

> I guess we might need a test for what SDK is available?
We can just use the WindowsSDKVersion environment variable to determine the
SDK for
current cmd session. It's set when you start the Visual Studio Prompt or
call one bat script.
Developers can choose the right version best suit their need. Detecting all
installed SDK
version can be done with some registry magic but I think that's not
necessary in this case.

We should change the title of the patch to "compile from source with VS2017
and SDK v10",
since that's the only problematic combination. Our need is compile our own
tools that link to
libpq and latest VC runtime. So libpq must also be linked with the same VC
runtime, and
thus use the same SDK version.

Best regards,
Peifeng Qiu