Enable linker GC for Android native release builds

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Resources/Base/BuildReleaseArm64SimpleDotNet.CoreCLR.apkdesc

@@ -17,7 +17,7 @@
       "Size": 5757272
     },
     "lib/arm64-v8a/libmonodroid.so": {
-      "Size": 1325936
+      "Size": 1257880
     },
     "lib/arm64-v8a/libSystem.Globalization.Native.so": {
       "Size": 72344
@@ -59,5 +59,5 @@
       "Size": 1904
     }
   },
-  "PackageSize": 7906747
-}
+  "PackageSize": 7838691
+}

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Resources/Base/BuildReleaseArm64SimpleDotNet.MonoVM.apkdesc

@@ -44,7 +44,7 @@
       "Size": 36416
     },
     "lib/arm64-v8a/libmonodroid.so": {
-      "Size": 1387064
+      "Size": 1274176
     },
     "lib/arm64-v8a/libmonosgen-2.0.so": {
       "Size": 3111632
@@ -62,7 +62,7 @@
       "Size": 162000
     },
     "lib/arm64-v8a/libxamarin-app.so": {
-      "Size": 19680
+      "Size": 19648
     },
     "res/drawable-hdpi-v4/icon.png": {
       "Size": 2178
@@ -89,5 +89,5 @@
       "Size": 1904
     }
   },
-  "PackageSize": 3320142
+  "PackageSize": 3207222
 }

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Resources/Base/BuildReleaseArm64XFormsDotNet.CoreCLR.apkdesc

@@ -41,7 +41,7 @@
       "Size": 5757272
     },
     "lib/arm64-v8a/libmonodroid.so": {
-      "Size": 1325808
+      "Size": 1257880
     },
     "lib/arm64-v8a/libSystem.Globalization.Native.so": {
       "Size": 72344
@@ -56,7 +56,7 @@
       "Size": 162000
     },
     "lib/arm64-v8a/libxamarin-app.so": {
-      "Size": 147616
+      "Size": 147584
     },
     "META-INF/androidx.activity_activity.version": {
       "Size": 6
@@ -2234,5 +2234,5 @@
       "Size": 794696
     }
   },
-  "PackageSize": 21179981
+  "PackageSize": 21112005
 }

src/Xamarin.Android.Build.Tasks/Tests/Xamarin.ProjectTools/Resources/Base/BuildReleaseArm64XFormsDotNet.MonoVM.apkdesc

@@ -35,91 +35,91 @@
       "Size": 25360
     },
     "lib/arm64-v8a/lib_Java.Interop.dll.so": {
-      "Size": 96344
+      "Size": 96576
     },
     "lib/arm64-v8a/lib_Mono.Android.dll.so": {
-      "Size": 542848
+      "Size": 542312
     },
     "lib/arm64-v8a/lib_Mono.Android.Runtime.dll.so": {
-      "Size": 26848
+      "Size": 26816
     },
     "lib/arm64-v8a/lib_mscorlib.dll.so": {
       "Size": 21408
     },
     "lib/arm64-v8a/lib_netstandard.dll.so": {
-      "Size": 23048
+      "Size": 23056
     },
     "lib/arm64-v8a/lib_System.Collections.dll.so": {
-      "Size": 33944
+      "Size": 33952
     },
     "lib/arm64-v8a/lib_System.Collections.NonGeneric.dll.so": {
-      "Size": 25608
+      "Size": 25624
     },
     "lib/arm64-v8a/lib_System.Collections.Specialized.dll.so": {
-      "Size": 23800
+      "Size": 23816
     },
     "lib/arm64-v8a/lib_System.ComponentModel.dll.so": {
-      "Size": 19560
+      "Size": 19568
     },
     "lib/arm64-v8a/lib_System.ComponentModel.Primitives.dll.so": {
       "Size": 21296
     },
     "lib/arm64-v8a/lib_System.ComponentModel.TypeConverter.dll.so": {
-      "Size": 43600
+      "Size": 43608
     },
     "lib/arm64-v8a/lib_System.Console.dll.so": {
-      "Size": 24392
+      "Size": 24400
     },
     "lib/arm64-v8a/lib_System.Core.dll.so": {
-      "Size": 19424
+      "Size": 19432
     },
     "lib/arm64-v8a/lib_System.Diagnostics.TraceSource.dll.so": {
-      "Size": 24584
+      "Size": 24592
     },
     "lib/arm64-v8a/lib_System.dll.so": {
-      "Size": 19784
+      "Size": 19792
     },
     "lib/arm64-v8a/lib_System.Drawing.dll.so": {
       "Size": 19400
     },
     "lib/arm64-v8a/lib_System.Drawing.Primitives.dll.so": {
-      "Size": 30016
+      "Size": 30032
     },
     "lib/arm64-v8a/lib_System.Formats.Asn1.dll.so": {
-      "Size": 50968
+      "Size": 50976
     },
     "lib/arm64-v8a/lib_System.IO.Compression.Brotli.dll.so": {
-      "Size": 29536
+      "Size": 29552
     },
     "lib/arm64-v8a/lib_System.IO.Compression.dll.so": {
-      "Size": 34600
+      "Size": 34616
     },
     "lib/arm64-v8a/lib_System.IO.IsolatedStorage.dll.so": {
-      "Size": 28232
+      "Size": 28240
     },
     "lib/arm64-v8a/lib_System.Linq.dll.so": {
-      "Size": 47912
+      "Size": 47920
     },
     "lib/arm64-v8a/lib_System.Linq.Expressions.dll.so": {
-      "Size": 185968
+      "Size": 185976
     },
     "lib/arm64-v8a/lib_System.Net.Http.dll.so": {
-      "Size": 86680
+      "Size": 86688
     },
     "lib/arm64-v8a/lib_System.Net.Primitives.dll.so": {
-      "Size": 42280
+      "Size": 42288
     },
     "lib/arm64-v8a/lib_System.Net.Requests.dll.so": {
-      "Size": 21520
+      "Size": 21528
     },
     "lib/arm64-v8a/lib_System.ObjectModel.dll.so": {
-      "Size": 26968
+      "Size": 26984
     },
     "lib/arm64-v8a/lib_System.Private.CoreLib.dll.so": {
-      "Size": 999864
+      "Size": 1000432
     },
     "lib/arm64-v8a/lib_System.Private.DataContractSerialization.dll.so": {
-      "Size": 217808
+      "Size": 217816
     },
     "lib/arm64-v8a/lib_System.Private.Uri.dll.so": {
       "Size": 62216
@@ -128,25 +128,25 @@
       "Size": 236968
     },
     "lib/arm64-v8a/lib_System.Private.Xml.Linq.dll.so": {
-      "Size": 35464
+      "Size": 35480
     },
     "lib/arm64-v8a/lib_System.Runtime.dll.so": {
-      "Size": 20352
+      "Size": 20360
     },
     "lib/arm64-v8a/lib_System.Runtime.InteropServices.dll.so": {
-      "Size": 19752
+      "Size": 19760
     },
     "lib/arm64-v8a/lib_System.Runtime.Numerics.dll.so": {
       "Size": 63312
     },
     "lib/arm64-v8a/lib_System.Runtime.Serialization.dll.so": {
-      "Size": 19328
+      "Size": 19336
     },
     "lib/arm64-v8a/lib_System.Runtime.Serialization.Formatters.dll.so": {
-      "Size": 20296
+      "Size": 20304
     },
     "lib/arm64-v8a/lib_System.Runtime.Serialization.Primitives.dll.so": {
-      "Size": 21424
+      "Size": 21432
     },
     "lib/arm64-v8a/lib_System.Security.Cryptography.dll.so": {
       "Size": 82024
@@ -155,10 +155,10 @@
       "Size": 194176
     },
     "lib/arm64-v8a/lib_System.Xml.dll.so": {
-      "Size": 19216
+      "Size": 19224
     },
     "lib/arm64-v8a/lib_System.Xml.Linq.dll.so": {
-      "Size": 19240
+      "Size": 19248
     },
     "lib/arm64-v8a/lib_UnnamedProject.dll.so": {
       "Size": 22040
@@ -239,10 +239,10 @@
       "Size": 36416
     },
     "lib/arm64-v8a/libmonodroid.so": {
-      "Size": 1385800
+      "Size": 1274176
     },
     "lib/arm64-v8a/libmonosgen-2.0.so": {
-      "Size": 3111840
+      "Size": 3111632
     },
     "lib/arm64-v8a/libSystem.Globalization.Native.so": {
       "Size": 72344
@@ -257,7 +257,7 @@
       "Size": 162000
     },
     "lib/arm64-v8a/libxamarin-app.so": {
-      "Size": 350616
+      "Size": 350432
     },
     "META-INF/androidx.activity_activity.version": {
       "Size": 6
@@ -2435,5 +2435,5 @@
       "Size": 794696
     }
   },
-  "PackageSize": 11024231
+  "PackageSize": 10983271
 }

src/native/CMakeLists.txt

@@ -463,8 +463,8 @@ set(POTENTIAL_COMMON_COMPILER_ARGS
   -fstack-protector-strong
   -fstrict-return
   -fno-strict-aliasing
-  -fno-function-sections
-  -fno-data-sections
+  -ffunction-sections
+  -fdata-sections
   -fno-dwarf-exceptions
   -fno-asynchronous-unwind-tables
   -funswitch-loops
@@ -495,6 +495,12 @@ set(POTENTIAL_COMMON_LINKER_ARGS
   LINKER:--no-eh-frame-hdr
 )
 
+if(NOT DEBUG_BUILD AND NOT ENABLE_CLANG_ASAN AND NOT ENABLE_CLANG_UBSAN)
+  list(APPEND POTENTIAL_COMMON_LINKER_ARGS
+    LINKER:--gc-sections
+  )
+endif()
+
 # Add some options to increase security. They may mildly affect performance but they won't be big, because the features are
 # assisted by the hardware.
 if((CMAKE_ANDROID_ARCH_ABI STREQUAL "x86") OR (CMAKE_ANDROID_ARCH_ABI STREQUAL "x86_64"))