Mark all assemblies as Trimmable via Directory.Build.props.#520
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akoeplinger
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akoeplinger
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jonathanpeppers
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This seems to get the assembly right:
Do we also need to bump some version numbers & dependencies to fully fix #519?
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Yes, we will need to bump and release all of AndroidX in a separate PR. |
eerhardt
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Mar 31, 2022
| <SupportedOSPlatformVersion>21</SupportedOSPlatformVersion> | ||
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| <!-- Mark .NET6+ packages as supporting trimming --> | ||
| <IsTrimmable>true</IsTrimmable> |
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Should we also remove this line?
This was referenced Apr 4, 2022
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To keep app sizes down in the .NET 6 timeframe, we special-cased existing AndroidX and GPS packages so they were always trimmed. Modern packages mark themselves trimmable with `$(IsTrimmable)` or the assembly-level attribute. For nearly 2 years, we've applied the appropriate trimming setting in these packages: * dotnet/android-libraries#520 * xamarin/GooglePlayServicesComponents#597 We should be able to remove this now in .NET 9.
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To keep app sizes down in the .NET 6 timeframe, we special-cased existing AndroidX and GPS packages so they were always trimmed. Modern packages mark themselves trimmable with `$(IsTrimmable)` or the assembly-level attribute. For nearly 2 years, we've applied the appropriate trimming setting in these packages: * dotnet/android-libraries#520 * xamarin/GooglePlayServicesComponents#597 We should be able to remove this now in .NET 9. With this change in place, an existing app size regression test failed that was using an old version of Xamarin.Forms (and AndroidX): Saving apk description to 'BuildReleaseArm64XFormsDotNet.apkdesc' Size difference in bytes ([*1] apk1 only, [*2] apk2 only): 253,683 assemblies/Xamarin.AndroidX.Core.dll 179,063 assemblies/Xamarin.Google.Android.Material.dll 157,233 assemblies/Xamarin.AndroidX.AppCompat.dll 104,239 assemblies/Xamarin.AndroidX.Media.dll *2 52,862 assemblies/Xamarin.AndroidX.Annotation.dll *2 48,743 assemblies/Xamarin.AndroidX.RecyclerView.dll 39,419 assemblies/Xamarin.AndroidX.Transition.dll *2 38,993 assemblies/Xamarin.AndroidX.Browser.dll *2 To avoid this increase: update the app size test from Xamarin.Forms 4.7.0.1142 to 5.0.0.2515. This allowed us to no longer need the `%(TrimMode)=link` changes, however updating Xamarin.Forms increased app size in other ways. * New AndroidX libraries contain considerable more `AndroidResource` and Java code. * New AndroidX `.dll` files appeared for new packages. * Luckily, it appears that no AndroidX `.dll` files grew in size, which is what would be the result of the `%(TrimMode)=link` change if it were still needed. Overall app size change in this test: --"PackageSize": 7941134 ++"PackageSize": 9593384
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Fixes: #519
In Xamarin.Android Classic we link all assemblies by default unless the user opts out. In .NET6+, assemblies must opt-in to being linked by setting
$(IsTrimmable).We already had this for packages using the default AndroidX template, but AndroidX dependencies (like Kotlin) bound in this repository use other templates that did not include trimming.
Enable trimming via
Directory.Build.targetsto ensure it affects all assemblies.From CI build for
Xamarin.Kotlin.Stdlib.dll: