backend: implement '-linkerArg' to pass arguments to the linker

backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -60,6 +60,8 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
             put(LIBRARY_FILES, 
                 arguments.libraries.toNonNullList())
 
+            put(LINKER_ARGS, arguments.linkerArguments.toNonNullList())
+
             put(NATIVE_LIBRARY_FILES,
                     arguments.nativeLibraries.toNonNullList())
 

backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.java

@@ -28,6 +28,10 @@ public class K2NativeCompilerArguments extends CommonCompilerArguments {
     @Argument(value = "nolink", description = "Don't link, just produce a bitcode file")
     public boolean nolink;
 
+    @Argument(value = "linkerArg", description = "Add argument to linker")
+    @ValueDescription("<arg>")
+    public String[] linkerArguments;
+
     @Argument(value = "nostdlib", description = "Don't link with stdlib")
     public boolean nostdlib;
 

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/KonanConfigurationKeys.kt

@@ -27,6 +27,8 @@ class KonanConfigKeys {
                 = CompilerConfigurationKey.create("compile the module as stdlib")
         val NOLINK: CompilerConfigurationKey<Boolean> 
                 = CompilerConfigurationKey.create("don't link, only produce a bitcode file ")
+        val LINKER_ARGS: CompilerConfigurationKey<List<String>>
+                = CompilerConfigurationKey.create("additional linker arguments")
         val TARGET: CompilerConfigurationKey<String?>
                 = CompilerConfigurationKey.create("target we compile for")
         val LIST_TARGETS: CompilerConfigurationKey<Boolean>

backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/LinkStage.kt

@@ -178,7 +178,9 @@ internal class LinkStage(val context: Context) {
     fun link(objectFiles: List<ObjectFile>): ExecutableFile {
         val executable = config.get(KonanConfigKeys.EXECUTABLE_FILE)!!
 
-        val linkCommand = platform.linkCommand(objectFiles, executable, optimize)
+        val linkCommand = platform.linkCommand(objectFiles, executable, optimize) +
+                config.getNotNull(KonanConfigKeys.LINKER_ARGS)
+
         runTool(*linkCommand.toTypedArray())
 
         return executable