This repository captures a bug I found when upgrading from Dev16 to Dev17 for building some of my personal projects. To reproduce this problem do the following:

Go to the Option1 directory and run the following command using the msbuild from Dev16 and Dev17:

msbuild /v:m /m /restore

Using the Dev16 version of msbuild the compilation will succeed but using the Dev17 version you get the following errors:

CSC : error CS5001: Program does not contain a static 'Main' method suitable for an entry point [C:\Users\jaredpar\temp\wpf\Option1\Option1.csproj]
C:\Users\jaredpar\temp\wpf\Option1\MainWindow.xaml.cs(25,13): error CS0103: The name 'InitializeComponent' does not exist in the current context [C:\
Users\jaredpar\temp\wpf\Option1\Option1.csproj]
C:\Users\jaredpar\temp\wpf\Option1\MainWindow.xaml.cs(27,13): error CS0103: The name '_tabControl' does not exist in the current context [C:\Users\ja
redpar\temp\wpf\Option1\Option1.csproj]

Looking at a binlog it's clear that the .g.cs files are not being generated and passed to the <Csc> task in Dev17

Repeating the same experiment in the Option2 directory will succeed for both Dev17 and Dev16.