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Context: https://bugzilla.xamarin.com/show_bug.cgi?id=54991 Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56081 Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56240 Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56493 Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56499 Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56567 Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56694
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Changes: dotnet/java-interop@1a086ff...56c92c7 * dotnet/java-interop@56c92c7: [build] Remove cecil submodule (dotnet#597) * dotnet/java-interop@3091274: [build] Provide a default $(Configuration) value (dotnet#612) * dotnet/java-interop@cf3e7c2: [generator] Don't process duplicate reference assemblies (dotnet#611) * dotnet/java-interop@f5fa462: [jnienv-gen] Convert to SDK-style (dotnet#608)
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Changes: dotnet/java-interop@1a086ff...56c92c7 * dotnet/java-interop@56c92c7: [build] Remove cecil submodule (#597) * dotnet/java-interop@3091274: [build] Provide a default $(Configuration) value (#612) * dotnet/java-interop@cf3e7c2: [generator] Don't process duplicate reference assemblies (#611) * dotnet/java-interop@f5fa462: [jnienv-gen] Convert to SDK-style (#608) Of particular note is [dotnet/java-interop@56c92c7][0], which replaces the `mono/cecil` submodule within Java.Interop with the [`Mono.Cecil` NuGet package][1] in an effort to simplify the Java.Interop build system. This simplifies the Java.Interop repo, and we *thought* that since xamarin-android *doesn't even use* Java.Interop's cecil submodule-built `Mono.Cecil.dll` -- instead the `Mono.Cecil.dll` from the "mono archive" is "renamed" to `Xamarin.Android.Cecil.dll` during `make prepare` (0c9f83b) -- surely this would be a simple change. The removal of the cecil submodule also required changing `ThirdPartyNotice.txt` generation so that the LICENSE for Cecil was obtained from the mono archive instead of from Java.Interop. Unfortunately, the integration was a tad more complicated than anticipated. With the ongoing adoption of MSBuild multi-targeting and builds against the `netcoreapp3.1` target framework -- commit e2854ee and numerous commits in Java.Interop -- we encountered a problem with MSBuild semantics: If two `$(TargetFramework)` builds share the same output directory, the `IncrementalClean` target will *remove files created by previous builds*, e.g. when e.g. `Java.Interop/tools/generator.csproj` builds the `netcoreapp3.1` framework, it will *delete* the `generator.exe` built by the `net472` framework, which results in subsequent build breaks. The only path to sanity is to *ensure* that different `$(TargetFramework)` builds have *completely separate* `$(OutputPath)` values. The "normal" approach to doing this is for `$(OutputPath)` to end with `$(TargetFramework)`, which is the case when `$(AppendTargetFrameworkToOutputPath)`=True (the default). Unfortunately in xamarin-android we don't want `$(OutputPath)` to end with `$(TargetFramework)`; we want the build tree structure to mirror the installation directory structure, which -- at present -- doesn't mention `$(TargetFramework)` at all. The solution here is to use "non-overlapping" directories. For example, in e2854ee there are "two" `$(OutputPath)` values: * `MonoAndroid10.0`: `bin/Debug/lib/xamarin.android/xbuild-frameworks/MonoAndroid/v10.0/Mono.Android.dll` * `netcoreapp3.1`: `bin/Debug/lib/xamarin.android/xbuild-frameworks/Xamarin.Android.App/netcoreapp3.1/Mono.Android.dll` The same "non-overlapping directories" strategy needs to be extended to *all* multi-targeted projects from Java.Interop, *including* dependencies. Dependencies such as `Xamarin.Android.Cecil.dll`. Define a new `$(UtilityOutputFullPathCoreApps)` MSBuild property so that Java.Interop "utility" project builds, when building for the `netcoreapp3.1` framework, use a *different* `Xamarin.Android.Cecil.dll` than is used with the `net472`-related builds. Update `xaprepare` to *create* this new `netcoreapp3.1`-correlated `Xamarin.Android.Cecil.dll`. It's the same file, just in a different directory, to prevent "accidental" deletes by `IncrementalClean`. Even with all that, MSBuild still had other ideas. In particular, MSBuild wasn't particularly happy about our attempt to use the `$(UtilityOutputFullPath)` property to "switch" between using a `@(PackageReference)` to the Mono.Cecil NuGet package vs. using a `@(Reference)` to the `Xamarin.Android.Cecil.dll` assembly, because MSBuild *caches* this information somewhere within `obj` directories. To get MSBuild to re-evaluate it's assembly reference choices, we must instead replace `msbuild` with `msbuild /restore`. Which still isn't enough, because some of our MSBuild invocations are via the `<MSBuild/>` task, within `msbuild`. To get *that* working, we need to explicitly invoke the `Restore` target through a *separate* `<MSBuild/>` task invocation. You ***CANNOT*** use `<MSBuild Targets="Restore;Build" />`, as "obvious" as that may be, because it [doesn't work reliably][2]. ([Yet.][3]) [0]: dotnet/java-interop@56c92c7 [1]: https://www.nuget.org/packages/Mono.Cecil/0.11.2 [2]: dotnet/msbuild#3000 (comment) [3]: dotnet/msbuild#2811
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Context: https://bugzilla.xamarin.com/show_bug.cgi?id=54991
Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56081
Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56240
Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56493
Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56499
Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56567
Context: https://bugzilla.xamarin.com/show_bug.cgi?id=56694