Gradle: compile at Java language level 11

Not 17 yet because if com.android.tools:desugar_jdk_libs ever needs to
be used, it only supports some JDK 11 APIs.

Author: UweTrottmann

api/build.gradle.kts

@@ -11,11 +11,6 @@ val sgCompileSdk: Int by rootProject.extra
 val sgMinSdk: Int by rootProject.extra
 val sgTargetSdk: Int by rootProject.extra
 
-tasks.withType(JavaCompile::class.java).configureEach {
-    // Suppress JDK 21 warning about deprecated, but not yet removed, source and target value 8 support
-    options.compilerArgs.add("-Xlint:-options")
-}
-
 android {
     namespace = "com.battlelancer.seriesguide.api"
     compileSdk = sgCompileSdk
@@ -26,8 +21,8 @@ android {
 
     compileOptions {
         encoding = "UTF-8"
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
 
     lint {

app/build.gradle.kts

@@ -23,14 +23,9 @@ val sgTargetSdk: Int by rootProject.extra
 val sgVersionCode: Int by rootProject.extra
 val sgVersionName: String by rootProject.extra
 
-tasks.withType(JavaCompile::class.java).configureEach {
-    // Suppress JDK 21 warning about deprecated, but not yet removed, source and target value 8 support
-    options.compilerArgs.add("-Xlint:-options")
-}
-
 kotlin {
     compilerOptions {
-        jvmTarget = JvmTarget.JVM_1_8
+        jvmTarget = JvmTarget.JVM_11
         // Using experimental flatMapLatest for Paging 3
         // Using experimental Material 3 compose APIs
         freeCompilerArgs.add("-opt-in=kotlinx.coroutines.ExperimentalCoroutinesApi,androidx.compose.material3.ExperimentalMaterial3Api")
@@ -97,8 +92,8 @@ android {
 
     compileOptions {
         encoding = "UTF-8"
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
 
     lint {

backend/build.gradle.kts

@@ -9,14 +9,9 @@ plugins {
 val sgCompileSdk: Int by rootProject.extra
 val sgMinSdk: Int by rootProject.extra
 
-tasks.withType(JavaCompile::class.java).configureEach {
-    // Suppress JDK 21 warning about deprecated, but not yet removed, source and target value 8 support
-    options.compilerArgs.add("-Xlint:-options")
-}
-
 kotlin {
     compilerOptions {
-        jvmTarget = JvmTarget.JVM_1_8
+        jvmTarget = JvmTarget.JVM_11
     }
 }
 
@@ -33,8 +28,8 @@ android {
 
     compileOptions {
         encoding = "UTF-8"
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
 
     packaging {

gradle.properties

@@ -15,6 +15,3 @@ android.useAndroidX=true
 # Do not turn on full mode for as long as possible: looking at unused.txt diff there are many
 # differences with an increased risk of breaking things.
 android.enableR8.fullMode=false
-
-# JDK 21 still supports source and target value 8, it will be removed in a future release
-android.javaCompile.suppressSourceTargetDeprecationWarning=true

widgets/build.gradle.kts

@@ -8,14 +8,9 @@ plugins {
 val sgCompileSdk: Int by rootProject.extra
 val sgMinSdk: Int by rootProject.extra
 
-tasks.withType(JavaCompile::class.java).configureEach {
-    // Suppress JDK 21 warning about deprecated, but not yet removed, source and target value 8 support
-    options.compilerArgs.add("-Xlint:-options")
-}
-
 kotlin {
     compilerOptions {
-        jvmTarget = JvmTarget.JVM_1_8
+        jvmTarget = JvmTarget.JVM_11
     }
 }
 
@@ -31,8 +26,8 @@ android {
 
     compileOptions {
         encoding = "UTF-8"
-        sourceCompatibility = JavaVersion.VERSION_1_8
-        targetCompatibility = JavaVersion.VERSION_1_8
+        sourceCompatibility = JavaVersion.VERSION_11
+        targetCompatibility = JavaVersion.VERSION_11
     }
 
 }