Pub does't work on Windows 8 when app is on different drive than Pub cache

[DartBot]

Originally opened as dart-lang/sdk#17050

This issue was originally filed by emurph...@conceptuamath.com

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What steps will reproduce the problem?

1. Install Dart on E:
2. Open a project on E: (probably would also work on C:)
3. Try to Pub get. Get this error message:

--- 3:10:20 PM Running pub get ... ---
Pub get failed, [1] Resolving dependencies.............................
Cannot create link, path = 'E:\projects\dart\ng-darrrt-codelab-master\packages\angular' (OS Error: Incorrect function.
, errno = 1)

Note that Pub Build will also fail, but with a different message, because it cant create lock file.

What is the expected output? What do you see instead?
Expect no error. If there is an error, I expect it to be clear, so tell me that Dart IDE and Pub cache must be on the same drive (letter) on windows.

What version of the product are you using? On what operating system? Dart Beta channel,
Dart Editor version 1.2.0.dev_05_12 (DEV)
Dart SDK version 1.2.0-dev.5.12
On Windows 8.1

Please provide any additional information below.
Seems that Pub cannot create a symbolic link across different drives on Windows 8.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/648527?v=3" align="left" width="48" height="48"hspace="10"> Comment by Fox32

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My cache is on C, and my code on D, works fine on Windows 8. Dart is unpacked on D. Maybe a different problem?

[DartBot]

This comment was originally written by emurph...@conceptuamath.com

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The most important detail is that the Dart ide is NOT on the same drive as the Pub cache. My ide is on drive E, my cache is on drive C.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/17034?v=3" align="left" width="48" height="48"hspace="10"> Comment by kevmoo

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Added Area-Pub, OpSys-Windows, Triaged labels.

[DartBot]

<img src="https://avatars.githubusercontent.com/u/188?v=3" align="left" width="48" height="48"hspace="10"> Comment by nex3

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This is a fundamental limitation of symbolic links on Windows. Issue #727 is tracking the removal of symlinks from pub's functionality. Until then, you can use the PUB_CACHE environment variable to control the location of your cache.

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Added Duplicate label.
Marked as being merged into #727.