Build problems on Windows when downloading openfast/dev as a zip instead of a git clone about openfast HOT 6 CLOSED

@ghaymanNREL were you trying to only build openfast or the testing framework, as well?

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@rafmudaf, only openfast. This is a Windows, vs-build system, issue that is tied to the custom prebuild step which uses the script: CreateGitVersion.bat. That script in turns attempts a git describe, which does not execute because it is not a git repository.

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You'd also get this error if you had a git clone but don't have the git-for-Windows command-line integration installed.

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On unix, this isn't an error in the build process but you do get a binary without a version:

mbp@~/Downloads/openfast-dev/install/bin: ./openfast 

 **************************************************************************************************
 OpenFAST

 Copyright (C)  National Renewable Energy Laboratory

 This program is licensed under Apache License Version 2.0 and comes with ABSOLUTELY NO WARRANTY.
 See the "LICENSE" file distributed with this software for details.
 **************************************************************************************************

 OpenFAST-HEAD-HASH-NOTFOUND

And the testing framework will not work since the git submodules can't be downloaded.

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@ghaymanNREL Is this an issue that we should fix? Since the GitHub zip download feature does not include the .git directory, its distributing an unversioned openfast.

If that's deemed acceptable, then the build scripts for all platforms could set the version string to "UNVERSIONED" when necessary.

@bjonkman brings up a good point which the suggestion above does not fix. Sharing a legitimately versioned copy of openfast does not guarantee a versioned build. I think we need to add a requirement for git in the required software section of the documentation for all platforms.

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Fixed by #194.

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