Add -Xjdk-release=1.8 everywhere we set jvmTarget

Author: lauzadis

aws-runtime/build.gradle.kts

@@ -63,11 +63,15 @@ subprojects {
     tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
         compilerOptions {
             jvmTarget.set(JvmTarget.JVM_1_8)
+            freeCompilerArgs.add("-Xjdk-release=1.8")
             freeCompilerArgs.add("-Xexpect-actual-classes")
         }
     }
+
+    // FIXME Do we need a separate `KotlinNativeCompile` configuration, is configuring KotlinCompile not enough?
     tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinNativeCompile> {
         compilerOptions {
+            freeCompilerArgs.add("-Xjdk-release=1.8")
             freeCompilerArgs.add("-Xexpect-actual-classes")
         }
     }

dokka-aws/build.gradle.kts

@@ -35,6 +35,7 @@ tasks.withType<Test>().configureEach {
 tasks.withType<KotlinCompile> {
     compilerOptions {
         jvmTarget.set(JvmTarget.JVM_1_8)
+        freeCompilerArgs.add("-Xjdk-release=1.8")
         allWarningsAsErrors.set(false) // FIXME Dokka bundles stdlib into the classpath, causing an unfixable warning
     }
 }

hll/build.gradle.kts

@@ -86,11 +86,13 @@ subprojects {
     tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
         compilerOptions {
             jvmTarget.set(JvmTarget.JVM_1_8)
+            freeCompilerArgs.add("-Xjdk-release=1.8")
             freeCompilerArgs.add("-Xexpect-actual-classes")
         }
     }
     tasks.withType<org.jetbrains.kotlin.gradle.tasks.KotlinNativeCompile> {
         compilerOptions {
+            freeCompilerArgs.add("-Xjdk-release=1.8")
             freeCompilerArgs.add("-Xexpect-actual-classes")
         }
     }

services/build.gradle.kts

@@ -131,6 +131,7 @@ subprojects {
         compilerOptions {
             allWarningsAsErrors.set(false) // FIXME Tons of errors occur in generated code
             jvmTarget.set(JvmTarget.JVM_1_8) // fixes outgoing variant metadata: https://github.com/smithy-lang/smithy-kotlin/issues/258
+            freeCompilerArgs.add("-Xjdk-release=1.8")
         }
     }