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Created attachment 25290 [details]
Using Xamarin VS4Mac 7.2, Xamarin.iOS 220.127.116.11 and Xamarin.Forms 18.104.22.1682, an Xamarin.Forms app fails to build with the following:
/Users/***/agent01/_work/.nuget/xamarin.forms/22.214.171.1242/build/netstandard1.0/Xamarin.Forms.targets(73,3): error MSB4018: System.IO.FileNotFoundException: Could not find file "/Users/admin/vsts-nventive/agent01/_work/4/s/***.Android/obj/Release/***.dll.mdb" [/Users/admin/vsts-nventive/agent01/_work/4/s/***.Android/***.Android.csproj]
This seems to be related to the fact that this variable https://github.com/xamarin/Xamarin.Forms/blob/7cb7c2a3d8b5e92ee9217c3b8c23bf8b5fbda50f/.nuspec/Xamarin.Forms.targets#L108 is forcibly set to "portable" by an environment variable, even though the project sets it to "Full".
Created attachment 25291 [details]
Does this occur with any new project? Only on VS Mac (assuming you can also test with VS Windows)? I think we may have had a some issues involving Xamarin.Forms.targets in the past, but more information on your situation in particular can possibly help look into it further. Typical clean/rebuild and deletion of bin/obj folders along with validating that package versions are aligned can possibly help as well.
After trying to get a repro, this issue is actually caused by Cecil.
Cecil has been on version 0.10.0-betaXX for quite a long time, and features have been added, such as the support for portable pdbs if I'm not mistaken, and I have an msbuild tool that runs before XamlC task that loads an ealier version of Mono.Cecil.
The XamlC task ends up using a version of the binary that's not appropriate, hence this issue.
I'll adjust this on my end, obviously, but the fact that Mono.Cecil stays this long on the same version is getting problematic, maybe making an interim release would help :)
Marking as resolved for upkeep per the above comment -- I don't have any exact insight at this moment as to the Cecil versioning, but I imagine it's set for a specific reason. That said, any further issues should be filed on GitHub issues as we have moved to there from Bugzilla.