Promote severity of configuration warnings to STRONG_WARNING

The reason is that these configuration problems may be the reason of
compilation errors, but they were hidden from the output because warnings are
not reported when there's at least one error

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

@@ -339,7 +339,7 @@ public abstract class CLICompiler<A extends CommonCompilerArguments> {
     private void reportUnknownExtraFlags(@NotNull MessageCollector collector, @NotNull A arguments) {
         for (String flag : arguments.unknownExtraFlags) {
             collector.report(
-                    CompilerMessageSeverity.WARNING,
+                    CompilerMessageSeverity.STRONG_WARNING,
                     "Flag is not supported by this version of the compiler: " + flag,
                     CompilerMessageLocation.NO_LOCATION
             );

compiler/cli/src/org/jetbrains/kotlin/cli/common/messages/AnalyzerWithCompilerReport.kt

@@ -206,7 +206,7 @@ class AnalyzerWithCompilerReport(private val messageCollector: MessageCollector)
 
         fun reportBytecodeVersionErrors(bindingContext: BindingContext, messageCollector: MessageCollector) {
             val severity = if (System.getProperty("kotlin.jvm.disable.bytecode.version.error") == "true")
-                CompilerMessageSeverity.WARNING
+                CompilerMessageSeverity.STRONG_WARNING
             else
                 CompilerMessageSeverity.ERROR
 

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/K2JVMCompiler.kt

@@ -152,7 +152,7 @@ class K2JVMCompiler : CLICompiler<K2JVMCompilerArguments>() {
 
                 if (destination != null) {
                     messageCollector.report(
-                            CompilerMessageSeverity.WARNING,
+                            CompilerMessageSeverity.STRONG_WARNING,
                             "The '-d' option with a directory destination is ignored because '-module' is specified",
                             CompilerMessageLocation.NO_LOCATION
                     )
@@ -365,7 +365,7 @@ class K2JVMCompiler : CLICompiler<K2JVMCompilerArguments>() {
                 }
                 else {
                     if (arguments.jdkHome != null) {
-                        messageCollector.report(CompilerMessageSeverity.WARNING,
+                        messageCollector.report(CompilerMessageSeverity.STRONG_WARNING,
                                                 "The '-jdk-home' option is ignored because '-no-jdk' is specified",
                                                 CompilerMessageLocation.NO_LOCATION)
                     }

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/compiler/KotlinCoreEnvironment.kt

@@ -67,8 +67,7 @@ import org.jetbrains.kotlin.cli.common.CliModuleVisibilityManagerImpl
 import org.jetbrains.kotlin.cli.common.KOTLIN_COMPILER_ENVIRONMENT_KEEPALIVE_PROPERTY
 import org.jetbrains.kotlin.cli.common.messages.CompilerMessageLocation
 import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity
-import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity.ERROR
-import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity.WARNING
+import org.jetbrains.kotlin.cli.common.messages.CompilerMessageSeverity.*
 import org.jetbrains.kotlin.cli.common.toBooleanLenient
 import org.jetbrains.kotlin.cli.jvm.JvmRuntimeVersionsConsistencyChecker
 import org.jetbrains.kotlin.cli.jvm.config.JavaSourceRoot
@@ -217,7 +216,7 @@ class KotlinCoreEnvironment private constructor(
                             FqName(it)
                         }
                         else {
-                            report(WARNING, "Invalid package prefix name is ignored: $it")
+                            report(STRONG_WARNING, "Invalid package prefix name is ignored: $it")
                             null
                         }
                     }
@@ -273,7 +272,7 @@ class KotlinCoreEnvironment private constructor(
         val path = root.file
         val localFile = findLocalDirectory(path.absolutePath)
         if (localFile == null) {
-            report(WARNING, "Classpath entry points to a non-existent location: $path")
+            report(STRONG_WARNING, "Classpath entry points to a non-existent location: $path")
             return null
         }
         return localFile
@@ -286,7 +285,7 @@ class KotlinCoreEnvironment private constructor(
         val path = root.file
         val jarFile = applicationEnvironment.jarFileSystem.findFileByPath("$path${URLUtil.JAR_SEPARATOR}")
         if (jarFile == null) {
-            report(WARNING, "Classpath entry points to a file that is not a JAR archive: $path")
+            report(STRONG_WARNING, "Classpath entry points to a file that is not a JAR archive: $path")
             return null
         }
         return jarFile
@@ -297,7 +296,7 @@ class KotlinCoreEnvironment private constructor(
 
         configuration.kotlinSourceRoots.forEach { path ->
             if (!uniqueSourceRoots.add(path)) {
-                report(WARNING, "Duplicate source root: $path")
+                report(STRONG_WARNING, "Duplicate source root: $path")
             }
         }
 

compiler/cli/src/org/jetbrains/kotlin/cli/metadata/K2MetadataCompiler.kt

@@ -65,7 +65,7 @@ class K2MetadataCompiler : CLICompiler<K2MetadataCompilerArguments>() {
             if (destination.endsWith(".jar")) {
                 // TODO: support .jar destination
                 collector.report(
-                        CompilerMessageSeverity.WARNING,
+                        CompilerMessageSeverity.STRONG_WARNING,
                         ".jar destination is not yet supported, results will be written to the directory with the given name",
                         CompilerMessageLocation.NO_LOCATION
                 )