As it stands today, the .NET 3.5 version of msbuild (or Visual Studio 2008) is 
required to build IronPython 2.6 Beta 2 from sources.  One cannot build 
IronPython.sln from the latest beta of Visual Studio 2010 without irreversibly 
upgrading all C# project files to Visual Studio 2010.  We're hoping to change 
that...

.NET 3.5 Service Pack 1 introduced a new feature which allows one to build 
Visual Studio 2010 C# project files using .NET 3.5 SP1.  All we need to do take 
advantage of this is change the "ToolsVersion" attribute of C# project files 
from "3.5" to "4.0".  There's one unfortunate side effect we've discovered thus 
far - we can no longer build IronPython.sln with anything less than .NET 3.5 
SP1 or Visual Studio 2008 SP1.

We understand it's a bit late in the IronPython 2.6 release cycle for this type 
of change, but feel it would provide a lot of value to those trying out Visual 
Studio 2010.  The question we have for everyone is does the benefit of being 
able to build IronPython under Visual Studio 2010 Betas outweigh the cost of no 
longer being able to build on .NET 3.5 without Service Pack 1 installed?  We'd 
love to hear any feedback you might have as this will strongly influence 
whatever decision we end up taking.

Thanks,

David Fugate
Microsoft - IronPython
http://knowbody.livejournal.com<http://knowbody.livejournal.com/>

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