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API differences between MSFT and source-built SDKs #5344

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API differences between MSFT and source-built SDKs#5344
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NikolaMilosavljevic
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area-upstream-fixNeeds a change in a contributing repoNeeds a change in a contributing repo

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@NikolaMilosavljevic
NikolaMilosavljevic
opened on Sep 18, 2025
Issue body actions

The following is the data collected by ApiCompat tool in strict mode, when diffing MSFT and SB built SDKs.

aspnetcore

shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll

error CP0001: Type 'Microsoft.AspNetCore.Hosting.WebHostBuilderHttpSysExtensions' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.AuthenticationManager' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.AuthenticationSchemes' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.ClientCertificateMethod' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.DelegationRule' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.Http503VerbosityLevel' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.HttpSysDefaults' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.HttpSysException' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.HttpSysOptions' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.HttpSysRequestTimingType' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.IHttpSysRequestDelegationFeature' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.IHttpSysRequestInfoFeature' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.IHttpSysRequestPropertyFeature' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.IHttpSysRequestTimingFeature' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.IServerDelegationFeature' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.RequestQueueMode' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.TimeoutManager' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.UrlPrefix' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.HttpSys.UrlPrefixCollection' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.HttpSys.dll

shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll

error CP0001: Type 'Microsoft.AspNetCore.Builder.IISServerOptions' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll
error CP0001: Type 'Microsoft.AspNetCore.Http.Features.IServerVariablesFeature' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.IIS.BadHttpRequestException' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.IIS.HttpContextExtensions' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.IIS.IIISEnvironmentFeature' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll
error CP0001: Type 'Microsoft.AspNetCore.Server.IIS.IISServerDefaults' exists on msft/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll but not on sb/shared/Microsoft.AspNetCore.App/x.y.z/Microsoft.AspNetCore.Server.IIS.dll

runtime

sdk/x.y.z/System.ComponentModel.Composition.dll

error CP0002: Member 'System.ComponentModel.Composition.Primitives.ComposablePartException.ComposablePartException(System.Runtime.Serialization.SerializationInfo, System.Runtime.Serialization.StreamingContext)' exists on sb/sdk/x.y.z/System.ComponentModel.Composition.dll but not on msft/sdk/x.y.z/System.ComponentModel.Composition.dll
error CP0008: Type 'System.ComponentModel.Composition.ReflectionModel.LazyMemberInfo' does not implement interface 'System.IEquatable<System.ComponentModel.Composition.ReflectionModel.LazyMemberInfo>' on msft/sdk/x.y.z/System.ComponentModel.Composition.dll but it does on sb/sdk/x.y.z/System.ComponentModel.Composition.dll

roslyn

sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll

All of these are conditioned under #if !NET8_0_OR_GREATER blocks.

SB assembly contains public type forwarders for these types. MSFT assembly targets .NET 6 so it is expected that these types are missing.

error CP0001: Type 'System.Diagnostics.CodeAnalysis.ExperimentalAttribute' exists on sb/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll but not on msft/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll
error CP0001: Type 'System.Diagnostics.CodeAnalysis.SetsRequiredMembersAttribute' exists on sb/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll but not on msft/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll
error CP0001: Type 'System.Runtime.CompilerServices.CollectionBuilderAttribute' exists on sb/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll but not on msft/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll
error CP0001: Type 'System.Runtime.CompilerServices.CompilerFeatureRequiredAttribute' exists on sb/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll but not on msft/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll
error CP0001: Type 'System.Runtime.CompilerServices.RequiredMemberAttribute' exists on sb/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll but not on msft/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/BuildHost-netcore/Microsoft.CodeAnalysis.Workspaces.MSBuild.BuildHost.dll

source-build-reference-packages - external packages

sdk/x.y.z/DotnetTools/dotnet-user-jwts/x.y.z/tools/net10.0/any/Microsoft.IdentityModel.Tokens.dll

error CP0001: Type 'Microsoft.IdentityModel.Tokens.EcdhKeyExchangeProvider' exists on msft/sdk/x.y.z/DotnetTools/dotnet-user-jwts/x.y.z/tools/net10.0/any/Microsoft.IdentityModel.Tokens.dll but not on sb/sdk/x.y.z/DotnetTools/dotnet-user-jwts/x.y.z/tools/net10.0/any/Microsoft.IdentityModel.Tokens.dll
error CP0002: Member 'bool Microsoft.IdentityModel.Tokens.SignatureProvider.Sign(System.ReadOnlySpan<byte>, System.Span<byte>, out int)' exists on msft/sdk/x.y.z/DotnetTools/dotnet-user-jwts/x.y.z/tools/net10.0/any/Microsoft.IdentityModel.Tokens.dll but not on sb/sdk/x.y.z/DotnetTools/dotnet-user-jwts/x.y.z/tools/net10.0/any/Microsoft.IdentityModel.Tokens.dll

sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/Humanizer.dll

error CP0003: sb/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/Humanizer.dll assembly version '1.0.0.0' should be equal to or higher than msft/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/Humanizer.dll version '2.14.0.0'.

sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/Microsoft.Build.Locator.dll

error CP0003: sb/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/Microsoft.Build.Locator.dll assembly version '1.8.1.0' should be equal to msft/sdk/x.y.z/DotnetTools/dotnet-watch/x.y.z/tools/net10.0/any/Microsoft.Build.Locator.dll version '1.0.0.0'.

sdk/x.y.z/Microsoft.ApplicationInsights.dll

error CP0003: sb/sdk/x.y.z/Microsoft.ApplicationInsights.dll assembly version '2.23.0.449' should be equal to msft/sdk/x.y.z/Microsoft.ApplicationInsights.dll version '2.23.0.29'.
error CP0003: msft/sdk/x.y.z/Microsoft.ApplicationInsights.dll assembly public key token '31bf3856ad364e35' does not match with sb/sdk/x.y.z/Microsoft.ApplicationInsights.dll 'f23a46de0be5d6f3'.

sdk/x.y.z/Microsoft.VisualStudio.SolutionPersistence.dll

error CP0001: Type 'System.Runtime.CompilerServices.IsExternalInit' exists on msft/sdk/x.y.z/Microsoft.VisualStudio.SolutionPersistence.dll but not on sb/sdk/x.y.z/Microsoft.VisualStudio.SolutionPersistence.dll
error CP0001: Type 'System.Runtime.CompilerServices.RequiresLocationAttribute' exists on msft/sdk/x.y.z/Microsoft.VisualStudio.SolutionPersistence.dll but not on sb/sdk/x.y.z/Microsoft.VisualStudio.SolutionPersistence.dll

sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll

error CP0008: Type 'Newtonsoft.Json.JsonReader' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.JsonTextReader' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.JsonTextWriter' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.JsonValidatingReader' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.JsonWriter' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.Bson.BsonReader' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.Bson.BsonWriter' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.Linq.JTokenReader' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0008: Type 'Newtonsoft.Json.Linq.JTokenWriter' does not implement interface 'System.IAsyncDisposable' on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but it does on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
error CP0001: Type 'Newtonsoft.Json.Serialization.DynamicValueProvider' exists on msft/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll but not on sb/sdk/x.y.z/Sdks/Microsoft.NET.Sdk.Razor/tools/Newtonsoft.Json.dll
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