Upgrade jvmTarget to 1.8

Author: Abduqodiri Qurbonzoda

.teamcity/additionalConfiguration.kt

@@ -6,8 +6,5 @@
 import jetbrains.buildServer.configs.kotlin.v2019_2.Project
 
 fun Project.additionalConfiguration() {
-    params {
-        param("env.JDK_6", "%env.JDK_16%")
-    }
     subProject(benchmarksProject(knownBuilds.buildVersion))
 }

README.md

@@ -158,9 +158,6 @@ Add dependencies (you can also add other modules that you need):
 
 ## Building from source
 
-> :information_source: To build this project you will need to have a path to JDK 6 specified with the `JDK_6` environment variable or gradle property.
-> For the local development purposes any JDK newer than that can be used instead.
-
 You can build and install artifacts to maven local with:
 
     gradlew build install

benchmarks/build.gradle.kts

@@ -9,8 +9,6 @@ plugins {
 
 evaluationDependsOn(":kotlinx-collections-immutable")
 
-val JDK_6: String by project
-
 kotlin {
     infra {
         target("macosX64")
@@ -21,8 +19,7 @@ kotlin {
     jvm {
         compilations.all {
             kotlinOptions {
-                jvmTarget = "1.6"
-                jdkHome = JDK_6
+                jvmTarget = "1.8"
             }
         }
     }

build.gradle.kts

@@ -20,8 +20,6 @@ infra {
     }
 }
 
-val JDK_6 by ext(System.getenv("JDK_6") ?: findProperty("JDK_6") as String? ?: error("Specify path to JDK 6 in JDK_6 environment variable or Gradle property"))
-
 allprojects {
     repositories {
         mavenCentral()

core/build.gradle.kts

@@ -13,8 +13,6 @@ mavenPublicationsPom {
     description.set("Kotlin Immutable Collections multiplatform library")
 }
 
-val JDK_6: String by project
-
 kotlin {
     infra {
         target("macosX64")
@@ -28,8 +26,7 @@ kotlin {
     jvm {
         compilations.all {
             kotlinOptions {
-                jvmTarget = "1.6"
-                jdkHome = JDK_6
+                jvmTarget = "1.8"
             }
         }
     }
@@ -111,6 +108,5 @@ kotlin {
 tasks {
     named("jvmTest", Test::class) {
         maxHeapSize = "1024m"
-        executable = "$JDK_6/bin/java"
     }
 }