[CoreCLR] Exclude diagnostic libraries from release APKs

[simonrozsival]

Summary

• exclude CoreCLR DAC/DBI diagnostic native libraries from Android APK packaging when debugger support is explicitly disabled
• update CoreCLR Release arm64 APK descriptor baselines to remove libmscordaccore.so and libmscordbi.so, including PackageSize reductions

APK descriptor size impact

Descriptor	Before	After	Delta
BuildReleaseArm64SimpleDotNet.CoreCLR.apkdesc	9,238,298	4,874,730	-4,363,568
BuildReleaseArm64XFormsDotNet.CoreCLR.apkdesc	22,873,019	18,509,451	-4,363,568

The PackageSize delta is exactly the raw size of the two removed APK entries:

Entry	Size
lib/arm64-v8a/libmscordaccore.so	2,463,848
lib/arm64-v8a/libmscordbi.so	1,899,720
Total	4,363,568

Local dotnet new maui APK size impact

Local Release publish of a blank dotnet new maui app for .apk (android-arm64):

APK	Size	Delta vs Mono	Delta vs CoreCLR before
CoreCLR Release before	22,039,645	+2,882,672 (+15.0%)	-
CoreCLR Release after	20,433,861	+1,276,888 (+6.7%)	-1,605,784 (-7.3%)
Mono Release	19,156,973	-	-

This saves about 1.53 MiB compressed in the CoreCLR APK and reduces the blank-app CoreCLR-vs-Mono gap from about 2.75 MiB to about 1.22 MiB.

Notes

libmscordbi.so and libmscordaccore.so are present in the CoreCLR runtime pack as native assets, so the Android packaging pipeline currently treats them as framework native libraries and includes them in APKs. Normal Android CoreCLR app startup does not load these libraries; they are debugger/diagnostic sidecars.

The exclusion is gated on DebuggerSupport == false. Android defaults DebuggerSupport=false for optimized Release apps, while Debug builds can leave the property unset; using an explicit false check avoids treating an unset Debug value as disabled. Projects that set DebuggerSupport=true continue to package these libraries.

Local investigation with a blank MAUI CoreCLR R2R app showed that removing both libraries reduced the APK by about 1.5 MiB compressed and the app still installed and cold-launched successfully on an Android device.

Additional local validation with a project-level target matching this PR showed:

• Debug CoreCLR with packaged assets and unset DebuggerSupport: DAC/DBI remain packaged
• Release default where DebuggerSupport=false: DAC/DBI are removed
• Release with DebuggerSupport=true: DAC/DBI remain packaged

Validation

• git diff --check
• parsed updated .apkdesc files with jq empty
• local blank MAUI Debug/Release publishes with binlogs for Debug CoreCLR packaged assets, Release default, and Release DebuggerSupport=true
• targeted repo test was not run because this clean worktree requires make prepare

[Copilot]

Pull request overview

This PR reduces CoreCLR Release APK size by excluding the CoreCLR diagnostic sidecar native libraries (DAC/DBI) from APK packaging when debugger support is disabled, and updates the corresponding APK descriptor baselines used by size-regression tests.

Changes:

• Exclude libmscordaccore.so and libmscordbi.so from CoreCLR native library processing when DebuggerSupport=false.
• Update CoreCLR Release arm64 .apkdesc baselines to remove the two entries and reflect reduced PackageSize.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/Xamarin.Android.Build.Tasks/Microsoft.Android.Sdk/targets/Microsoft.Android.Sdk.AssemblyResolution.targets	Adds conditional exclusions for DAC/DBI native libraries in CoreCLR when DebuggerSupport is disabled.
src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Resources/Base/BuildReleaseArm64SimpleDotNet.CoreCLR.apkdesc	Updates Release arm64 baseline descriptor to remove DAC/DBI entries and adjust PackageSize.
src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Resources/Base/BuildReleaseArm64XFormsDotNet.CoreCLR.apkdesc	Updates Release arm64 baseline descriptor to remove DAC/DBI entries and adjust PackageSize.

[simonrozsival]

@copilot let's switch the conditions to '$(AndroidIncludeDebugSymbols)' == 'true' for consisntecy

[Copilot]

Done in 3381cc7. Switched both conditions from '$(DebuggerSupport)' == 'false' to '$(AndroidIncludeDebugSymbols)' != 'true', consistent with how line 288 gates the Mono debugger component.