This test demonstrates the issue of no valid default project config causes issues in Rosyln with project references.

The line <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> in \FailingProgram\DummyProgram.csproj is causing Compilation.References to not include the system libraries associated with the project when no property group targets the AnyCPU profile.

To create a new project that fails the test:

• Open Configuration Manager
• Under "Active Solution Platform" chose <New...>
• Create a new platform targeting x86 with "Crate new project platforms" checked.
• Under "Active Solution Platform" chose <Edit...>
• Delete AnyCPU
• Under "Platform" for DummyProgram choose <Edit...>
• Delete AnyCPU

Be sure to delete the project level AnyCPU entries along with the solution level entries or the tests will not show the problem.

Workaround to fix the issue:

• Edit DummyProgram.csproj with notepad
• Change <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform> to <Platform Condition=" '$(Platform)' == '' ">x86</Platform>