Multi-targeting build does not surface inner errors when tasks fail

In the attached project, I’m trying to build it with msbuild /t:restore;build on Windows (with all of the Xamarin stuff installed). The problem is that the Xamarin targets are reporting warnings (for some reason?) and while they appear to build ok and produce output dll’s, the Sdk build reports it as failed and thus fails the build.

Microsoft.Identity.Client.zip

Done Building Project "C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity.Client.csproj" (Build target(s)) --
 FAILED.

Done Building Project "C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity.Client.csproj" (build target(s)) --
 FAILED.


Build FAILED.

"C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity.Client.csproj" (build target) (1) ->
"C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity.Client.csproj" (Build target) (1:8) ->
(_GetPrimaryCpuAbi target) ->
  C:\Program Files (x86)\MSBuild\Xamarin\Android\Xamarin.Android.Common.Debugging.targets(308,2): warning : One or more
 errors occurred. [C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity.Client.csproj]


"C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity.Client.csproj" (build target) (1) ->
"C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity.Client.csproj" (Build target) (1:9) ->
(_SayHello target) ->
  C:\Program Files (x86)\MSBuild\Xamarin\iOS\Xamarin.iOS.Windows.After.targets(63,5): warning VSX1000: The project Micr
osoft.Identity.Client was built while disconnected from a Mac agent, so only the main assembly was compiled. Connect to
 a Xamarin Mac build agent to build the full application. [C:\dev\msal\src\Microsoft.Identity.Client\Microsoft.Identity
.Client.csproj]

    2 Warning(s)
    0 Error(s)

Time Elapsed 00:00:04.01

[srivatsn]

@onovotny can you file a separate bug for allowing restore;build?

[dsplaisted]

I think the issue here was that the inner build was getting an out of memory exception, which wasn’t being reported cleanly. I believe “normal” errors from the inner builds should be reported correctly.