Internally within my organisation we maintain a code library, some of our applications are built on .NET 4 while older applications are still built on .NET 3.5.
We have build configurations that target either the .NET 4 or .NET 3.5 framework and this works as expected. We hit a problem when we want to build NuGet packages that include the output from each build configuration into a single nupkg file (since a NuGet package can support multiple framework targets).
Has anybody come up with a solution to automate this scenario?
After having a good look around I found my solution by looking at how the Autofac project handled the problem.
From this I have built a solution using MSBuild.