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[r8] add r8 and depot_tools submodules.
depot_tools is required to build r8. On Windows it is however not used but a binary executable zip will be downloaded and used instead. (see https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up for details) r8 build is not integrated in the primary Makefile and .sln yet. (r8 is not a "build tool" but we build msbuild tasks dependencies there too.)
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‎.gitmodules‎

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path = external/xamarin-android-tools
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url = https://github.com/xamarin/xamarin-android-tools
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branch = master
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[submodule "external/depot_tools"]
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path = external/depot_tools
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url = https://chromium.googlesource.com/chromium/tools/depot_tools.git
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[submodule "external/r8"]
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path = external/r8
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url = https://r8.googlesource.com/r8
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[submodule "external/dlfcn-win32"]
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path = external/dlfcn-win32
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url = https://github.com/dlfcn-win32/dlfcn-win32.git

‎build-tools/r8/r8.csproj‎

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<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<Configuration Condition="'$(Configuration)'==''">Debug</Configuration>
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</PropertyGroup>
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<Import Project="r8.props" />
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<Import Project="..\..\Configuration.props" />
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<Import Project="r8.targets" />
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</Project>
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‎build-tools/r8/r8.props‎

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<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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</Project>
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‎build-tools/r8/r8.targets‎

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<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<UsingTask TaskName="Xamarin.Android.Tasks.Unzip" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
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<UsingTask AssemblyFile="$(MSBuildThisFileDirectory)..\..\bin\Build$(Configuration)\xa-prep-tasks.dll" TaskName="Xamarin.Android.BuildTools.PrepTasks.DownloadUri" />
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<!-- public targets -->
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<Target Name="Build" DependsOnTargets="_SetupDepotTools;_BuildR8;_CopyR8" />
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<Target Name="Clean" DependsOnTargets="_CleanR8;_CleanDepotTools" />
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<!-- depot_tools -->
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<!-- Why do people split files and make build scripts unreadable? That's unacceptable. Therefore properties are here. Always consider code readability. -->
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<PropertyGroup>
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<_WindowsDepotToolzZipDownload>..\..\bin\Build$(Configuration)\depot_tools.zip</_WindowsDepotToolzZipDownload>
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</PropertyGroup>
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<Target Name="_SetupDepotTools" DependsOnTargets="_SetupDepotToolsWindows" />
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<Target Name="_CleanDepotTools" DependsOnTargets="_CleanDepotToolsWindows" />
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<Target Name="_SetupDepotToolsWindows" Condition="$(HostOS) == 'Windows'">
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<DownloadUri
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SourceUris="https://storage.googleapis.com/chrome-infra/depot_tools.zip"
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DestinationFiles="$(_WindowsDepotToolzZipDownload)"
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/>
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<Unzip
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Sources="$(_WindowsDepotToolsZipDownload)"
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Destination="bin\Build$(Configuration)\depot_tools"
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/>
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</Target>
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<Target Name="_CleanDepotToolsWindows" Condition="$(HostOS) == 'Windows'">
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<RemoveDir Directories="bin\Build$(Configuration)\depot_tools" />
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</Target>
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<!-- r8 -->
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<PropertyGroup>
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<_PathToDepotTools Condition="'$(HostOS)' == 'Windows'">..\..\bin\Build$(Configuration)\depot_tools</_PathToDepotTools>
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<_PathToDepotTools Condition="'$(HostOS)' != 'Windows'">..\..\external\depot_tools</_PathToDepotTools>
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<_Sep Condition="'$(HostOS)' == 'Windows'">;</_Sep>
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<_Sep Condition="'$(HostOS)' != 'Windows'">:</_Sep>
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<_W Condition="'$(HostOS)' == 'Windows'">"</_W>
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<_W Condition="'$(HostOS)' != 'Windows'"></_W> <_EnvForDepotTools>PATH=$(_W)$(_PathToDepotTools)$(_W)$(_Sep)$(PATH)</_EnvForDepotTools>
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</PropertyGroup>
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<Target Name="_BuildR8" DependsOnTargets="_SetupDepotTools">
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<Exec
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Command="..\..\external\r8\tools\gradle.py d8 r8"
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WorkingDirectory="..\..\external\r8"
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EnvironmentVariables="$(_EnvForDepotTools)"
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/>
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</Target>
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<Target Name="_CopyR8">
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<Copy
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SourceFiles="..\..\external\r8\build\libs\r8.jar"
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DestinationFolder="$(XAInstallPrefix)\xbuild\Xamarin\Android\"
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SkipUnchangedFiles="true"
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/>
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</Target>
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<Target Name="_CleanR8">
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<Exec
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Command="..\..\external\r8\tools\gradle.py clean"
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WorkingDirectory="..\..\external\r8"
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EnvironmentVariables="$(_EnvForDepotTools)"
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/>
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</Target>
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</Project>

‎external/depot_tools‎

Submodule depot_tools added at a16b4cc

‎external/r8‎

Submodule r8 added at d7c62cf

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