Remove warning for running the compiler under Java 6/7

Now the compiler won't even start, so no need to check this manually.

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/CommonCompilerArguments.java

@@ -79,9 +79,6 @@ public abstract class CommonCompilerArguments implements Serializable {
     @Argument(value = "Xno-check-impl", description = "Do not check presence of 'impl' modifier in multi-platform projects")
     public boolean noCheckImpl;
 
-    @Argument(value = "Xskip-java-check", description = "Do not warn when running the compiler under Java 6 or 7")
-    public boolean noJavaVersionWarning;
-
     @Argument(value = "Xcoroutines=warn")
     public boolean coroutinesWarn;
 

compiler/cli/src/org/jetbrains/kotlin/cli/common/CLICompiler.java

@@ -18,7 +18,6 @@ package org.jetbrains.kotlin.cli.common;
 
 import com.intellij.openapi.Disposable;
 import com.intellij.openapi.util.Disposer;
-import com.intellij.openapi.util.SystemInfo;
 import kotlin.collections.ArraysKt;
 import org.fusesource.jansi.AnsiConsole;
 import org.jetbrains.annotations.NotNull;
@@ -142,7 +141,6 @@ public abstract class CLICompiler<A extends CommonCompilerArguments> {
         }
 
         reportUnknownExtraFlags(messageCollector, arguments);
-        reportUnsupportedJavaVersion(messageCollector, arguments);
 
         GroupingMessageCollector groupingCollector = new GroupingMessageCollector(messageCollector);
 
@@ -337,16 +335,6 @@ public abstract class CLICompiler<A extends CommonCompilerArguments> {
         }
     }
 
-    private void reportUnsupportedJavaVersion(MessageCollector collector, A arguments) {
-        if (!SystemInfo.isJavaVersionAtLeast("1.8") && !arguments.noJavaVersionWarning) {
-            collector.report(
-                    CompilerMessageSeverity.STRONG_WARNING,
-                    "Running the Kotlin compiler under Java 6 or 7 is unsupported and will no longer be possible in a future update.",
-                    CompilerMessageLocation.NO_LOCATION
-            );
-        }
-    }
-
     @NotNull
     protected abstract ExitCode doExecute(
             @NotNull A arguments,

compiler/testData/cli/js/jsExtraHelp.out

@@ -8,7 +8,6 @@ where advanced options include:
   -Xplugin <path>            Load plugins from the given classpath
   -Xmulti-platform           Enable experimental language support for multi-platform projects
   -Xno-check-impl            Do not check presence of 'impl' modifier in multi-platform projects
-  -Xskip-java-check          Do not warn when running the compiler under Java 6 or 7
   -Xcoroutines={enable|warn|error} Enable coroutines or report warnings or errors on declarations and use sites of 'suspend' modifier
 
 Advanced options are non-standard and may be changed or removed without any notice.

compiler/testData/cli/jvm/extraHelp.out

@@ -20,7 +20,6 @@ where advanced options include:
   -Xplugin <path>            Load plugins from the given classpath
   -Xmulti-platform           Enable experimental language support for multi-platform projects
   -Xno-check-impl            Do not check presence of 'impl' modifier in multi-platform projects
-  -Xskip-java-check          Do not warn when running the compiler under Java 6 or 7
   -Xcoroutines={enable|warn|error} Enable coroutines or report warnings or errors on declarations and use sites of 'suspend' modifier
 
 Advanced options are non-standard and may be changed or removed without any notice.

compiler/tests-common/org/jetbrains/kotlin/integration/KotlinIntegrationTestBase.java

@@ -82,9 +82,6 @@ public abstract class KotlinIntegrationTestBase extends TestCaseWithTmpdir {
         content = normalizePath(content, getKotlinProjectHome(), "[KotlinProjectHome]");
         content = content.replaceAll(Pattern.quote(KotlinCompilerVersion.VERSION), "[KotlinVersion]");
         content = StringUtil.convertLineSeparators(content);
-        content = Pattern.compile("^.+running the Kotlin compiler under Java 6 or 7 is unsupported and will no longer be possible in a future update\\.\n", Pattern.MULTILINE)
-                .matcher(content)
-                .replaceAll("");
         return content;
     }
 

compiler/tests/org/jetbrains/kotlin/cli/AbstractCliTest.java

@@ -74,7 +74,6 @@ public abstract class AbstractCliTest extends TestCaseWithTmpdir {
                 .replace("expected version is " + JvmMetadataVersion.INSTANCE, "expected version is $ABI_VERSION$")
                 .replace("expected version is " + JsMetadataVersion.INSTANCE, "expected version is $ABI_VERSION$")
                 .replace("\\", "/")
-                .replaceAll("^.+running the Kotlin compiler under Java 6 or 7 is unsupported and will no longer be possible in a future update\\.\n", "")
                 .replace(KotlinCompilerVersion.VERSION, "$VERSION$");
 
         return normalizedOutputWithoutExitCode + exitCode;

compiler/tests/org/jetbrains/kotlin/integration/CompilerSmokeTestBase.java

@@ -43,7 +43,6 @@ public abstract class CompilerSmokeTestBase extends KotlinIntegrationTestBase {
         javaArgs.add("org.jetbrains.kotlin.cli.jvm.K2JVMCompiler");
 
         Collections.addAll(javaArgs, arguments);
-        javaArgs.add("-Xskip-java-check");
 
         return run(logName, ArrayUtil.toStringArray(javaArgs));
     }

compiler/tests/org/jetbrains/kotlin/multiplatform/AbstractMultiPlatformIntegrationTest.kt

@@ -84,7 +84,7 @@ abstract class AbstractMultiPlatformIntegrationTest : KtUsefulTestCase() {
     private fun CLICompiler<*>.compile(sources: List<File>, vararg additionalArguments: String): String = buildString {
         val (output, exitCode) = AbstractCliTest.executeCompilerGrabOutput(
                 this@compile,
-                sources.map(File::getAbsolutePath) + listOf("-Xmulti-platform", "-Xskip-java-check") + additionalArguments
+                sources.map(File::getAbsolutePath) + listOf("-Xmulti-platform") + additionalArguments
         )
         appendln("Exit code: $exitCode")
         appendln("Output:")

libraries/tools/kotlin-maven-plugin/src/it/simple/verify.groovy

@@ -34,8 +34,6 @@ State state = new File(basedir, "build.log").readLines().collect { it.replaceAll
                 replace("\\", "/").
                 replaceAll(/[0-9]+\s*ms/, "LLL ms").
                 trim().
-                // TODO: Remove after build is launched only under java 8
-                replaceAll(/\[WARNING] Running the Kotlin compiler under Java 6 or 7 is unsupported and will no longer be possible in a future update./, "").
                 replaceAll(/^\[[A-Z]+\]$/, "").
                 replaceAll(/version [0-9a-z-+\.]+/, "version @snapshot@")