title: VS2017 xamarin project rebuild freezes
body: <p>I have installed VS2017 and have a simple xamarin project in VS2017.
  When rebuilding the solution, vs2017 appears to hang.</p>
  
  <p>Restarting VS2017 does not fix the issue. Rebooting the PC does fix it but then after a few builds it will freeze again.</p>
  
  <p>(the code essentially remains consistent - just whitespace changes to try and mitigate code issues)</p>
  
  <p>I have tried leaving the build running for several minutes and even several hours, but once it fails to build it never will, until I reboot the PC.</p>
  
  <p>It does though allow me to cancel the build upon which it dumps a detailed log. (i have changed the build output settings to "detailed").</p>
  
  <p>It does not matter how long I leave the build but when I cancel it, the build output always appears to "freeze" at the same point.</p>
  
  <p>Below are the last few lines of the build output:</p>
  
  <pre><code>1&gt;Done executing task "CreateProperty".
  1&gt;Done building target "_ResolveMonoAndroidSdks" in project "Insync2.csproj".
  1&gt;Target "_SetupDesignTimeBuildForIntellisense" in file "C:\Program Files\Microsoft Visual Studio\2017\Professional\MSBuild\Xamarin\Android\Xamarin.Android.Common.Debugging.targets" from project "C:\Users\baldevsandhu\documents\visual studio 2017\Projects\Insync2\Insync2\Insync2.csproj" (target "_GetPrimaryCpuAbi" depends on it):
  1&gt;Done building target "_SetupDesignTimeBuildForIntellisense" in project "Insync2.csproj".
  1&gt;Target "_GetPrimaryCpuAbi" in file "C:\Program Files\Microsoft Visual Studio\2017\Professional\MSBuild\Xamarin\Android\Xamarin.Android.Common.Debugging.targets" from project "C:\Users\baldevsandhu\documents\visual studio 2017\Projects\Insync2\Insync2\Insync2.csproj" (target "_CheckInstantRunCondition" depends on it):
  1&gt;Using "GetPrimaryCpuAbi" task from assembly "C:\Program Files\Microsoft Visual Studio\2017\Professional\MSBuild\Xamarin\Android\Xamarin.Android.Build.Debugging.Tasks.dll".
  1&gt;Task "GetPrimaryCpuAbi"
  1&gt;  Adb Task:
  1&gt;    AdbTarget: 
  1&gt;    AdbOptions: 
  1&gt;    DevicePropertyCache: obj\Debug\devices.cache
  1&gt;  Reading properties for emulator-5554
  1&gt;C:\Program Files\Microsoft Visual Studio\2017\Professional\MSBuild\Xamarin\Android\Xamarin.Android.Common.Debugging.targets(308,2): warning : One or more errors occurred.
  1&gt;Done executing task "GetPrimaryCpuAbi".
  1&gt;Done building target "_GetPrimaryCpuAbi" in project "Insync2.csproj" -- FAILED.
  1&gt;
  1&gt;Build FAILED.
  1&gt;
  1&gt;Time Elapsed 00:10:05.74
  Build has been canceled.
  </code></pre>
  
  <p>Has anyone seen this issue before?</p>
  
  <p>I did have VS2015 installed first, but this has since been uninstalled.</p>