[Android] Use NDK toolchain instead of CMake for library mode (#88886)

This change switches from relying on CMake to clang directly for Android library mode. The intent is to keep the number of build dependencies to a minimum.

Author: steveisok

src/mono/mono/mini/aot-compiler.c

@@ -15371,7 +15371,11 @@ emit_aot_image (MonoAotCompile *acfg)
 			acfg->tmpbasename = g_build_filename (temp_path, "temp", (const char*)NULL);
 			acfg->tmpfname = g_strdup_printf ("%s.s", acfg->tmpbasename);
 			acfg->llvm_sfile = g_strdup_printf ("%s-llvm.s", acfg->tmpbasename);
-			acfg->llvm_ofile = g_strdup_printf ("%s-llvm." AS_OBJECT_FILE_SUFFIX, acfg->tmpbasename);
+
+			if (acfg->aot_opts.static_link)
+				acfg->llvm_ofile = g_strdup (acfg->aot_opts.llvm_outfile);
+			else
+				acfg->llvm_ofile = g_strdup_printf ("%s-llvm." AS_OBJECT_FILE_SUFFIX, acfg->tmpbasename);
 
 			g_free (temp_path);
 		}

src/mono/msbuild/android/build/AndroidBuild.targets

@@ -2,8 +2,7 @@
   <PropertyGroup>
     <AndroidGenerateAppBundle Condition="'$(AndroidGenerateAppBundle)' == '' and '$(GenerateAppBundle)' != ''">$(GenerateAppBundle)</AndroidGenerateAppBundle>
     <AndroidGenerateAppBundle Condition="'$(AndroidGenerateAppBundle)' == ''">true</AndroidGenerateAppBundle>
-    <!-- Unable to properly integrate nativelib into app build, so not supported for now. -->
-    <AndroidGenerateAppBundle Condition="'$(_IsLibraryMode)' == 'true'">false</AndroidGenerateAppBundle>
+    <AndroidGenerateAppBundle Condition="'$(_IsLibraryMode)' == 'true' and '$(ForceLibraryModeGenerateAppBundle)' != 'true'">false</AndroidGenerateAppBundle>
 
     <EnableDefaultAssembliesToBundle Condition="'$(EnableDefaultAssembliesToBundle)' == ''">false</EnableDefaultAssembliesToBundle>
   </PropertyGroup>
@@ -47,6 +46,12 @@
     </PropertyGroup>
 
     <ItemGroup Condition="'$(_IsLibraryMode)' == 'true'">
+      <_CommonLinkerArgs Include="-l:libz.so" />
+      <_CommonLinkerArgs Include="-l:liblog.so" />
+      <_CommonLinkerArgs Include="-l:libc.so" />
+      <_CommonLinkerArgs Include="-l:libm.so" />
+      <_CommonLinkerArgs Include="--build-id=sha1" />
+
       <!-- add all non stub libs first -->
       <!-- if RuntimeComponents is empty, exclude -static.a and include -stub-static.a instead -->
       <!-- if RuntimeComponents is *, we're ok because all -static.a is included -->
@@ -74,6 +79,7 @@
     </PropertyGroup>
 
     <RemoveDir Directories="$(AndroidBundleDir)" />
+    <MakeDir Directories="$(AndroidBundleDir)" />
   </Target>
 
   <Target Name="_AndroidResolveReferences">
@@ -110,6 +116,7 @@
     <PropertyGroup Condition="'$(_IsLibraryMode)' == 'true'">
       <_UsesRuntimeInitCallback>$(UsesRuntimeInitCallback)</_UsesRuntimeInitCallback>
       <_UsesRuntimeInitCallback Condition="'$(_UsesRuntimeInitCallback)' == ''">true</_UsesRuntimeInitCallback>
+      <_AotOutputType>ObjectFile</_AotOutputType>
     </PropertyGroup>
 
     <ItemGroup>
@@ -142,7 +149,7 @@
     </PropertyGroup>
 
     <NdkToolFinderTask
-      Condition="'$(AOTWithLibraryFiles)' == 'true'"
+      Condition="'$(AOTWithLibraryFiles)' == 'true' or '$(_IsLibraryMode)' == 'true'"
       Architecture="$(TargetArchitecture)"
       HostOS="$(_HostOS)"
       MinApiLevel="$(AndroidLibraryMinApiLevel)">
@@ -154,7 +161,7 @@
       <Output TaskParameter="ClangPath" PropertyName="_ClangPath" />
     </NdkToolFinderTask>
 
-    <PropertyGroup Condition="'$(AOTWithLibraryFiles)' == 'true'">
+    <PropertyGroup Condition="'$(AOTWithLibraryFiles)' == 'true' or '$(_IsLibraryMode)' == 'true'">
       <_AsPrefixPath>$([MSBuild]::EnsureTrailingSlash('$(_AsPrefixPath)'))</_AsPrefixPath>
       <_ToolPrefixPath>$([MSBuild]::EnsureTrailingSlash('$(_ToolPrefixPath)'))</_ToolPrefixPath>
     </PropertyGroup>

src/tasks/AndroidAppBuilder/AndroidAppBuilder.csproj

@@ -13,12 +13,14 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.Build.Tasks.Core" Version="$(MicrosoftBuildTasksCoreVersion)" />
   </ItemGroup>
+  <ItemGroup>
+      <ProjectReference Include="$(RepoRoot)src\tasks\MobileBuildTasks\MobileBuildTasks.csproj" />
+  </ItemGroup>
   <ItemGroup>
     <Compile Include="ApkBuilder.cs" />
     <Compile Include="AndroidAppBuilder.cs" />
     <Compile Include="AndroidApkFileReplacerTask.cs" />
     <Compile Include="AndroidLibBuilderTask.cs" />
-    <Compile Include="..\Common\Builders\AndroidProject.cs" />
     <Compile Include="..\Common\AndroidSdkHelper.cs" />
     <Compile Include="..\Common\DexBuilder.cs" />
     <Compile Include="..\Common\JarBuilder.cs" />

src/tasks/AndroidAppBuilder/ApkBuilder.cs

@@ -7,6 +7,7 @@
 using System.Linq;
 using System.Text;
 using System.Text.RegularExpressions;
+using Microsoft.Android.Build;
 using Microsoft.Build.Framework;
 using Microsoft.Build.Utilities;
 

src/tasks/AndroidAppBuilder/Templates/monodroid-librarymode.c

@@ -53,5 +53,8 @@ Java_net_dot_MonoRunner_initRuntime (JNIEnv* env, jobject thiz, jstring j_files_
     setenv ("TMPDIR", cache_dir, true);
     setenv ("TEST_RESULTS_DIR", testresults_dir, true);
 
+    //setenv ("MONO_LOG_LEVEL", "debug", true);
+    //setenv ("MONO_LOG_MASK", "all", true);
+
     return invoke_netlibrary_entrypoints ();
 }

src/tasks/AotCompilerTask/MonoAOTCompiler.cs

@@ -413,7 +413,7 @@ private bool ProcessAndValidateArguments()
                 throw new LogAsErrorException($"'{nameof(AotModulesTableLanguage)}' must be one of: '{nameof(MonoAotModulesTableLanguage.C)}', '{nameof(MonoAotModulesTableLanguage.ObjC)}'. Received: '{AotModulesTableLanguage}'.");
         }
 
-        if (!string.IsNullOrEmpty(AotModulesTablePath))
+        if (!string.IsNullOrEmpty(AotModulesTablePath) || parsedOutputType == MonoAotOutputType.ObjectFile)
         {
             // AOT modules for static linking, needs the aot modules table
             UseStaticLinking = true;
@@ -863,6 +863,20 @@ private PrecompileArguments GetPrecompileArgumentsFor(ITaskItem assemblyItem, st
             }
         }
 
+        if (!string.IsNullOrEmpty(TempPath))
+        {
+            aotArgs.Add($"temp-path={TempPath}");
+        }
+        else if (!string.IsNullOrEmpty(IntermediateOutputPath))
+        {
+            string aotTmpPath = Path.Combine(IntermediateOutputPath, assemblyFilename + ".tmp");
+            if (!Directory.Exists(aotTmpPath))
+            {
+                Directory.CreateDirectory(aotTmpPath);
+            }
+            aotArgs.Add($"temp-path={aotTmpPath}");
+        }
+
         if (EnableUnmanagedCallersOnlyMethodsExport)
         {
             string exportSymbolsFile = Path.Combine(OutputDir, Path.ChangeExtension(assemblyFilename, ".exportsymbols"));
@@ -896,7 +910,6 @@ private PrecompileArguments GetPrecompileArgumentsFor(ITaskItem assemblyItem, st
             }
         }
 
-
         if (AotProfilePath?.Length > 0)
         {
             aotArgs.Add("profile-only");
@@ -920,11 +933,6 @@ private PrecompileArguments GetPrecompileArgumentsFor(ITaskItem assemblyItem, st
             aotArgs.Add(AotArguments);
         }
 
-        if (!string.IsNullOrEmpty(TempPath))
-        {
-            aotArgs.Add($"temp-path={TempPath}");
-        }
-
         if (!string.IsNullOrEmpty(LdName))
         {
             aotArgs.Add($"ld-name={LdName}");

src/tasks/Common/Builders/AndroidProject.cs

@@ -354,6 +354,24 @@ public static bool IsWindows()
 #endif
     }
 
+    public static bool IsMacOS()
+    {
+#if NETCOREAPP
+        return OperatingSystem.IsMacOS();
+#else
+        return false;
+#endif
+    }
+
+    public static bool IsLinux()
+    {
+#if NETCOREAPP
+        return OperatingSystem.IsLinux();
+#else
+        return false;
+#endif
+    }
+
     public static bool IsManagedAssembly(string filePath)
     {
         if (!File.Exists(filePath))