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Truncate Target skipped condition message #5315

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KirillOsenkov opened this issue Apr 26, 2020 · 0 comments · Fixed by #5553
Closed

Truncate Target skipped condition message #5315

KirillOsenkov opened this issue Apr 26, 2020 · 0 comments · Fixed by #5553
Labels
Area: Logging help wanted Issues that the core team doesn't plan to work on, but would accept a PR for. Comment to claim. Performance-Scenario-Build This issue affects build performance. triaged
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Backlog

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@KirillOsenkov
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When a Condition is evaluated to false when comparing items with an empty string the following TargetSkippedEventArgs is logged:

Target "ShimReferencePathsWhenCommonTargetsDoesNotUnderstandReferenceAssemblies" skipped, due to false condition; ('@(ReferencePathWithRefAssemblies)' == '') was evaluated as ('C:\Users\Kirill\.nuget\packages\microsoft.netframework.referenceassemblies.net472\1.0.0-alpha-004\build\.NETFramework\v4.7.2\Accessibility.dll;C:\Users\Kirill\.nuget\packages\basicundo\0.9.3\lib\net45\BasicUndo.dll;C:\Users\Kirill\.nuget\packages\castle.core\4.3.1\lib\net45\Castle.Core.dll;C:\Users\Kirill\.nuget\packages\diffplex\1.4.4\lib\net40\DiffPlex.dll;C:\Users\Kirill...

This particular one is 46,284 chars long. A 130 MB binlog contains 33,524 of these, totalling 23,573,872 chars.

I'm thinking when dumping this particular message we should shorten items to say a 1,000 characters? Not sure if there is a situation where we need to have these in full, but they'll be recoverable from the surrounding log context if really necessary. Maybe just take the first two items, concatenate and then truncate to 1,000 chars?

I'm sure the current behavior also results in tons of memory allocations and traffic across nodes.
@KirillOsenkov KirillOsenkov added Area: Logging Performance-Scenario-Build This issue affects build performance. labels Apr 26, 2020
@rainersigwald rainersigwald added this to the Backlog milestone Jul 15, 2020
@rainersigwald rainersigwald added the help wanted Issues that the core team doesn't plan to work on, but would accept a PR for. Comment to claim. label Jul 15, 2020
jonathanpeppers added a commit to jonathanpeppers/msbuild that referenced this issue Jul 29, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars
a72b07e 
Fixes: dotnet#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Concurrent.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Immutable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.NonGeneric.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Specialized.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Annotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.DataAnnotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.EventBasedAsync.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.TypeConverter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Configuration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Console.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.Common.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.DataSetExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Contracts.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Debug.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.DiagnosticSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.FileVersionInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Process.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.StackTrace.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TextWriterTraceListener.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.DispatchProxy.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.ILGeneration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.Lightweight.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Metadata.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.TypeExtensions.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Claims.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Algorithms.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Csp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Encoding.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Thread.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.ThreadPool.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Timer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.Local.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As dotnet#5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit, some examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n;...' keeping the last full item intact

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

Open to suggestions, this is the first time I've really dug into this
codebase, thanks.
@jonathanpeppers jonathanpeppers mentioned this issue Jul 29, 2020
Merged
jonathanpeppers added a commit to jonathanpeppers/roslyn that referenced this issue Jul 30, 2020
@jonathanpeppers
Fix string expansion in ShimReferencePathsWhenCommonTargetsDoesNotUnd…
2f821f2 
…erstandReferenceAssemblies

Context: dotnet/msbuild#5553
Context: dotnet/msbuild#5315

When building this repo:

https://github.com/xamarin/net6-samples

With the command:

    dotnet build .\HelloAndroid\HelloAndroid.csproj -bl

Even if the project is already built completely, a second call
generates a log message such as:

    Target "ShimReferencePathsWhenCommonTargetsDoesNotUnderstandReferenceAssemblies" skipped, due to false condition; ('@(ReferencePathWithRefAssemblies)' == '') was evaluated as ('C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.TypeExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Resources.Reader.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Resources.ResourceManager.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Resources.Writer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.CompilerServices.Unsafe.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.CompilerServices.VisualC.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Handles.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.JavaScript.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.RuntimeInformation.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Intrinsics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Loader.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Numerics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Formatters.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Claims.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Algorithms.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Csp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Encoding.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.X509Certificates.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Principal.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.SecureString.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ServiceModel.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ServiceProcess.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.CodePages.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encodings.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.RegularExpressions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Channels.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Overlapped.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Dataflow.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Thread.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.ThreadPool.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Timer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.Local.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ValueTuple.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.HttpUtility.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Windows.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.ReaderWriter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll' == '').

This means that MSBuild is expanding a 36,619 character string then
checking if it matches `''`.

Changing this to use the `->Count()` item function, the log message
changes to:

    Target "ShimReferencePathsWhenCommonTargetsDoesNotUnderstandReferenceAssemblies" skipped, due to false condition; ('@(ReferencePathWithRefAssemblies->Count())' == '0') was evaluated as ('156' == '0').

`->Count()` should also return 0 when the item group is
non-existent/empty:

https://docs.microsoft.com/visualstudio/msbuild/item-functions

Someone might know a better option than `->Count()`, let me know.

I ran PerfView before and after, and although these numbers from the
`GC Heap Alloc Ignore Free` report fluctuate we can see a decent
improvement in `String` allocations:

    Name               	Exc %	        Exc	  Exc Ct	Inc %	          Inc	  Inc Ct
    Type System.String 	 23.1	 41,994,992	 194,066	 23.1	   41,994,992	 194,066
    Type System.String 	 23.1	 41,842,544	 194,033	 23.1	   41,842,544	 194,033
@jonathanpeppers jonathanpeppers mentioned this issue Jul 30, 2020
Closed
jonathanpeppers added a commit to jonathanpeppers/msbuild that referenced this issue Jul 31, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars
bb05897 
Fixes: dotnet#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Concurrent.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Immutable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.NonGeneric.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Specialized.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Annotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.DataAnnotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.EventBasedAsync.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.TypeConverter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Configuration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Console.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.Common.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.DataSetExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Contracts.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Debug.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.DiagnosticSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.FileVersionInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Process.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.StackTrace.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TextWriterTraceListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tools.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TraceSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tracing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Dynamic.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Formats.Asn1.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Calendars.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As dotnet#5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit for string length and 3 as an item limit, some
examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n0;n1;n2;...' 3 items or 1024 chars

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

Open to suggestions, this is the first time I've really dug into this
codebase, thanks.
jonathanpeppers added a commit to jonathanpeppers/msbuild that referenced this issue Aug 4, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars
3870986 
Fixes: dotnet#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As dotnet#5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit for string length and 3 as an item limit, some
examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n0;n1;n2;...' 3 items or 1024 chars

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

Open to suggestions, this is the first time I've really dug into this
codebase, thanks.
jonathanpeppers added a commit to jonathanpeppers/msbuild that referenced this issue Aug 5, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars
a509e73 
Fixes: dotnet#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Concurrent.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Immutable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.NonGeneric.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Specialized.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Annotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.DataAnnotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.EventBasedAsync.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.TypeConverter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Configuration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Console.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.Common.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.DataSetExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Contracts.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Debug.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.DiagnosticSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.FileVersionInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Process.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.StackTrace.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TextWriterTraceListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tools.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TraceSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tracing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Dynamic.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Formats.Asn1.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Calendars.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.Watcher.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.IsolatedStorage.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.MemoryMappedFiles.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Pipes.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.UnmanagedMemoryStream.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Expressions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Queryable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Memory.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.HttpListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Mail.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NameResolution.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NetworkInformation.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Ping.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Requests.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Security.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.ServicePoint.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Sockets.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebClient.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebHeaderCollection.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebProxy.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebSockets.Client.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebSockets.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Numerics.Vectors.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Numerics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ObjectModel.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ValueTuple.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.HttpUtility.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Windows.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.ReaderWriter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As dotnet#5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit for string length and 3 as an item limit, some
examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n0;n1;n2;...' 3 items or 1024 chars

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

I added an escape hatch named `%MSBuildDoNotTruncateConditions%` to
opt out of the new behavior.
jonathanpeppers added a commit to jonathanpeppers/xamarin-android that referenced this issue Aug 6, 2020
@jonathanpeppers
[Xamarin.Android.Build.Tasks] fix enormous string expansion
aa0a138 
Context: dotnet/msbuild#5553
Context: dotnet/msbuild#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Concurrent.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Immutable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.NonGeneric.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Specialized.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Annotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.DataAnnotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.EventBasedAsync.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.TypeConverter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Configuration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Console.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.Common.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.DataSetExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Contracts.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Debug.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.DiagnosticSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.FileVersionInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Process.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.StackTrace.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TextWriterTraceListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tools.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TraceSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tracing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Dynamic.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Formats.Asn1.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Calendars.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.Brotli.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.FileSystem.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.ZipFile.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.DriveInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.Watcher.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.IsolatedStorage.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.MemoryMappedFiles.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Pipes.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.UnmanagedMemoryStream.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Expressions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Queryable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Memory.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.HttpListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Mail.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NameResolution.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NetworkInformation.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Ping.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Requests.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Security.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.ServicePoint.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Sockets.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebClient.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebHeaderCollection.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebProxy.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebSockets.Client.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebSockets.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Numerics.Vectors.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Numerics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ObjectModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.DispatchProxy.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.ILGeneration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.Lightweight.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Metadata.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.TypeExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Resources.Reader.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Resources.ResourceManager.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Resources.Writer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.CompilerServices.Unsafe.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.CompilerServices.VisualC.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Handles.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.JavaScript.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.RuntimeInformation.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Intrinsics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Loader.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Numerics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Formatters.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Claims.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Algorithms.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Csp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Encoding.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.X509Certificates.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Principal.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.SecureString.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ServiceModel.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ServiceProcess.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.CodePages.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android.

There *is* a "fast path" in MSBuild that actually evaluating the
`Condition` will not expand the string when you compare against `''`.
However, the string gets expanded anyway to produce the above log
message! At least it's not getting expanded twice?

The fix is to use `->Count()` instead:

    '@(_XACandidateNETStandardReferences->Count())' != '0'

Which prints a much shorter log message:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences->Count())' != '0') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and '156' != '0')

I fixed a similar message in Roslyn:

dotnet/roslyn#46445

~~ Results ~~

In a build with no changes:

    > dotnet build .\HelloAndroid\HelloAndroid.csproj -bl -v:quiet

I could see a difference:

    Project "HelloAndroid.csproj" (default targets): (1.024s)
    Project "HelloAndroid.csproj" (default targets): (968ms)

The `<GetDependsOnNETStandard/>` MSBuild task runs 4 times in this
project because it is building for multiple `$(RuntimeIdentifiers)`.

This saved ~56ms in one example, but it might not be noticeable at all
in "legacy" Xamarin.Android.

Down the road I will see if we can drop
`Xamarin.Android.PCLSupport.targets` completely for .NET 6 projects.
@jonathanpeppers jonathanpeppers mentioned this issue Aug 6, 2020
Merged
jonathanpeppers added a commit to jonathanpeppers/xamarin-android that referenced this issue Aug 7, 2020
@jonathanpeppers
[Xamarin.Android.Build.Tasks] fix enormous string expansion
9a25f74 
Context: dotnet/msbuild#5553
Context: dotnet/msbuild#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Concurrent.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Immutable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.NonGeneric.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Specialized.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Annotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.DataAnnotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.EventBasedAsync.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tools.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TraceSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tracing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Dynamic.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Formats.Asn1.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Calendars.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Queryable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Memory.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.HttpListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Mail.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NameResolution.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android.

There *is* a "fast path" in MSBuild that actually evaluating the
`Condition` will not expand the string when you compare against `''`.
However, the string gets expanded anyway to produce the above log
message! At least it's not getting expanded twice?

The fix is to use `->Count()` instead:

    '@(_XACandidateNETStandardReferences->Count())' != '0'

Which prints a much shorter log message:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences->Count())' != '0') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and '156' != '0')

I fixed a similar message in Roslyn:

dotnet/roslyn#46445

~~ Results ~~

In a build with no changes:

    > dotnet build .\HelloAndroid\HelloAndroid.csproj -bl -v:quiet

I could see a difference:

    Project "HelloAndroid.csproj" (default targets): (1.024s)
    Project "HelloAndroid.csproj" (default targets): (968ms)

The `<GetDependsOnNETStandard/>` MSBuild task runs 4 times in this
project because it is building for multiple `$(RuntimeIdentifiers)`.

This saved ~56ms in one example, but it might not be noticeable at all
in "legacy" Xamarin.Android.

Down the road I will see if we can drop
`Xamarin.Android.PCLSupport.targets` completely for .NET 6 projects.

I went ahead and fixed any cases of `'@(Foo)' != ''` and updated
`MSBuildBestPractices.md`. The others would not likely be checking
against large item groups, but they could be.
jonathanpeppers added a commit to jonathanpeppers/msbuild that referenced this issue Aug 7, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars
e49ba46 
Fixes: dotnet#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As dotnet#5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit for string length and 3 as an item limit, some
examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n0;n1;n2;...' 3 items or 1024 chars

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

I added an escape hatch named `%MSBuildDoNotTruncateConditions%` to
opt out of the new behavior.
jonathanpeppers added a commit to jonathanpeppers/msbuild that referenced this issue Aug 7, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars
1617bca 
Fixes: dotnet#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As dotnet#5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit for string length and 3 as an item limit, some
examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n0;n1;n2;...' 3 items or 1024 chars

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

I added an escape hatch named `%MSBuildDoNotTruncateConditions%` to
opt out of the new behavior.
dellis1972 pushed a commit to dotnet/android that referenced this issue Aug 10, 2020
@jonathanpeppers
[Xamarin.Android.Build.Tasks] fix enormous string expansion (#4984)
51d1da7 
Context: dotnet/msbuild#5553
Context: dotnet/msbuild#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Concurrent.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Immutable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.NonGeneric.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Specialized.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Annotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.DataAnnotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.EventBasedAsync.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.TypeConverter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Configuration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Console.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.Common.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.DataSetExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Contracts.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Debug.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.DiagnosticSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.FileVersionInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Process.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.StackTrace.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TextWriterTraceListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tools.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TraceSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tracing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Dynamic.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Formats.Asn1.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Calendars.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.Brotli.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.FileSystem.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.ZipFile.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.DriveInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.Watcher.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.IsolatedStorage.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.MemoryMappedFiles.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Pipes.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.UnmanagedMemoryStream.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Expressions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Queryable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Memory.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.HttpListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Mail.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NameResolution.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NetworkInformation.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Ping.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Requests.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Security.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.ServicePoint.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Sockets.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebClient.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebHeaderCollection.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebProxy.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebSockets.Client.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebSockets.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Numerics.Vectors.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Numerics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ObjectModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.DispatchProxy.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.ILGeneration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.Lightweight.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Metadata.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.TypeExtensions.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.JavaScript.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.RuntimeInformation.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.InteropServices.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Intrinsics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Loader.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Numerics.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Formatters.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Claims.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Algorithms.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Csp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Encoding.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Cryptography.X509Certificates.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.Principal.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.SecureString.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Security.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ServiceModel.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ServiceProcess.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.CodePages.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encodings.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.RegularExpressions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Channels.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Overlapped.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Dataflow.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Thread.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.ThreadPool.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Timer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.Local.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ValueTuple.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.HttpUtility.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Windows.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.ReaderWriter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android.

There *is* a "fast path" in MSBuild that actually evaluating the
`Condition` will not expand the string when you compare against `''`.
However, the string gets expanded anyway to produce the above log
message! At least it's not getting expanded twice?

The fix is to use `->Count()` instead:

    '@(_XACandidateNETStandardReferences->Count())' != '0'

Which prints a much shorter log message:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences->Count())' != '0') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and '156' != '0')

I fixed a similar message in Roslyn:

dotnet/roslyn#46445

~~ Results ~~

In a build with no changes:

    > dotnet build .\HelloAndroid\HelloAndroid.csproj -bl -v:quiet

I could see a difference:

    Project "HelloAndroid.csproj" (default targets): (1.024s)
    Project "HelloAndroid.csproj" (default targets): (968ms)

The `<GetDependsOnNETStandard/>` MSBuild task runs 4 times in this
project because it is building for multiple `$(RuntimeIdentifiers)`.

This saved ~56ms in one example, but it might not be noticeable at all
in "legacy" Xamarin.Android.

Down the road I will see if we can drop
`Xamarin.Android.PCLSupport.targets` completely for .NET 6 projects.

I went ahead and fixed any cases of `'@(Foo)' != ''` and updated
`MSBuildBestPractices.md`. The others would not likely be checking
against large item groups, but they could be.
jonathanpeppers added a commit to jonathanpeppers/msbuild that referenced this issue Aug 10, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars
3fcbcaa 
Fixes: dotnet#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encoding.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Encodings.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Text.RegularExpressions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Channels.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Overlapped.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Dataflow.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Tasks.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Thread.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.ThreadPool.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.Timer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Threading.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.Local.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Transactions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ValueTuple.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.HttpUtility.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Web.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Windows.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.ReaderWriter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.Serialization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As dotnet#5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit for string length and 3 as an item limit, some
examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n0;n1;n2;...' 3 items or 1024 chars

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

I added an escape hatch named `%MSBuildDoNotTruncateConditions%` to
opt out of the new behavior.
jonpryor pushed a commit to dotnet/android that referenced this issue Aug 10, 2020
@jonathanpeppers @jonpryor
[Xamarin.Android.Build.Tasks] fix enormous string expansion (#4984)
d4733d9 
Context: dotnet/msbuild#5553
Context: dotnet/msbuild#5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Concurrent.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Immutable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.NonGeneric.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.Specialized.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Collections.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Annotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.DataAnnotations.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.EventBasedAsync.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.TypeConverter.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.ComponentModel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Configuration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Console.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.Common.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.DataSetExtensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Data.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Contracts.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Debug.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.DiagnosticSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.FileVersionInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Process.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.StackTrace.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TextWriterTraceListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tools.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TraceSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tracing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Dynamic.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Formats.Asn1.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Calendars.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.Brotli.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.FileSystem.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.ZipFile.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Compression.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.DriveInfo.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.Watcher.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.FileSystem.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.IsolatedStorage.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.MemoryMappedFiles.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.Pipes.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.UnmanagedMemoryStream.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.IO.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Expressions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Parallel.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.Queryable.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Linq.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Memory.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.Json.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Http.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.HttpListener.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Mail.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NameResolution.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.NetworkInformation.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Ping.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Requests.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Security.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.ServicePoint.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.Sockets.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Net.WebClient.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.DispatchProxy.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.ILGeneration.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.Lightweight.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Emit.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Extensions.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Metadata.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Reflection.TypeExtensions.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.XDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XPath.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlDocument.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.XmlSerializer.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Xml.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\WindowsBase.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\mscorlib.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android.

There *is* a "fast path" in MSBuild that actually evaluating the
`Condition` will not expand the string when you compare against `''`.
However, the string gets expanded anyway to produce the above log
message! At least it's not getting expanded twice?

The fix is to use `->Count()` instead:

    '@(_XACandidateNETStandardReferences->Count())' != '0'

Which prints a much shorter log message:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences->Count())' != '0') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and '156' != '0')

I fixed a similar message in Roslyn:

dotnet/roslyn#46445

~~ Results ~~

In a build with no changes:

    > dotnet build .\HelloAndroid\HelloAndroid.csproj -bl -v:quiet

I could see a difference:

    Project "HelloAndroid.csproj" (default targets): (1.024s)
    Project "HelloAndroid.csproj" (default targets): (968ms)

The `<GetDependsOnNETStandard/>` MSBuild task runs 4 times in this
project because it is building for multiple `$(RuntimeIdentifiers)`.

This saved ~56ms in one example, but it might not be noticeable at all
in "legacy" Xamarin.Android.

Down the road I will see if we can drop
`Xamarin.Android.PCLSupport.targets` completely for .NET 6 projects.

I went ahead and fixed any cases of `'@(Foo)' != ''` and updated
`MSBuildBestPractices.md`. The others would not likely be checking
against large item groups, but they could be.
Forgind pushed a commit that referenced this issue Aug 12, 2020
@jonathanpeppers
Truncate Target/Task skipped log messages to 1024 chars (#5553)
5cd6ca1 
Fixes: #5315

I have seen some comically long log messages such as:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.Core.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.VisualBasic.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.Win32.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.AppContext.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Buffers.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tools.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.TraceSource.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Diagnostics.Tracing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.Primitives.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Drawing.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Dynamic.Runtime.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Formats.Asn1.dll;C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\System.Globalization.Calendars.dll;C:\Program 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Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\netstandard.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Java.Interop.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.Export.dll;C:\src\net5-samples\packages\microsoft.android.ref\11.0.100-ci.master.11\ref\net5.0\Mono.Android.dll' != '').

This message is ~18K characters long.

This particular example has been around since PCL support was added
for Xamarin.Android:

https://github.com/xamarin/xamarin-android/blob/8a88207de27b2eab13e33ba235df0b757f6f3935/src/Xamarin.Android.Build.Tasks/Xamarin.Android.PCLSupport.targets#L41-L45

We should probably change this ourselves, as it isn't beneficial to
create an enormous string like this.

As #5315 mentions, we could shorten this log message to something like:

    Task "GetDependsOnNETStandard" skipped, due to false condition; ('$(_HasReferenceToSystemRuntime)' != 'true' and '$(_IsXBuild)' != 'true' and '$(DependsOnNETStandard)' == '' and '@(_XACandidateNETStandardReferences)' != '') was evaluated as ('true' != 'true' and 'true' != 'true' and '' == '' and 'C:\Program Files\dotnet\packs\Microsoft.NETCore.App.Ref\5.0.0-rc.1.20371.13\ref\net5.0\Microsoft.CSharp.dll;...' != '')

I don't think any information would be lost here? You should be able
to figure out the value of each variable in the surrounding log.

I chose 1024 as a limit for string length and 3 as an item limit, some
examples:

    '$(Foo)' would be expanded to 'n{1024}...'
    '%(Foo)' would be expanded to 'n{1024}...'
    '@(Foo)' would be expanded to 'n0;n1;n2;...' 3 items or 1024 chars

I created a test case that has an example of all of the above.

To implement this, I created `ExpanderOptions.Truncate` to only be
used when creating the skip messages for tasks and targets.

I then had to make changes to `Substring()` in three places: metadata,
properties, and item groups.

I added an escape hatch named `%MSBuildDoNotTruncateConditions%` to
opt out of the new behavior.
@AR-May AR-May added the triaged label Feb 21, 2024
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Area: Logging help wanted Issues that the core team doesn't plan to work on, but would accept a PR for. Comment to claim. Performance-Scenario-Build This issue affects build performance. triaged
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Truncate Target/Task skipped log messages to 1024 chars jonathanpeppers/msbuild
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@KirillOsenkov @rainersigwald @AR-May