[Issue 18659] New: All modern window API calls are disabled

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18659

          Issue ID: 18659
           Summary: All modern window API calls are disabled
           Product: D
           Version: D2
          Hardware: x86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: musicaljelly at gmail.com

I recently found that I could use CancelIo(), but not CancelIoEx(). I looked at
winbase.d, and found that CancelIoEx() is wrapped with 'static if (_WIN32_WINNT
> 0x600) (I'm on Windows 10, so this shouldn't have been an issue).

I looked at w32api.d where this enum is defined, and found a bunch of version
statements that set __WIN32_WINNT based on your windows version. I put a
pragma(msg) into Windows10 block and compiled, and nothing was printed. I then
moved it into the fallback else block, and it printed. This indicates to me
that this version if-else is not working as intended.

This version if-else is using version labels (like Windows10, Windows8_1, etc)
that aren't listed in the docs. Are they real version labels that are actually
supported? They don't seem to be working on my machine.

Fair warning, I'm running a relatively old version of D currently (2.072.1).
But unless these version statements have been added recently (and the docs
don't seem to indicate this), then this issue still exists.

Let me know if there's anything I can test or if any more details would be
helpful.

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