[K/N][gradle][interop] Arg to specify relative dir for libraryPath

kotlin-native/Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/jvm/CommandLine.kt

@@ -27,6 +27,7 @@ const val NODEFAULTLIBS = "no-default-libs"
 const val NOENDORSEDLIBS = "no-endorsed-libs"
 const val PURGE_USER_LIBS = "Xpurge-user-libs"
 const val TEMP_DIR = "Xtemporary-files-dir"
+const val PROJECT_DIR = "Xproject-dir"
 const val NOPACK = "nopack"
 const val COMPILE_SOURCES = "Xcompile-source"
 const val SHORT_MODULE_NAME = "Xshort-module-name"
@@ -63,6 +64,8 @@ open class CommonInteropArguments(val argParser: ArgParser) {
             description = "Don't pack the produced library into a klib file").default(false)
     val tempDir by argParser.option(ArgType.String, TEMP_DIR,
             description = "save temporary files to the given directory")
+    val projectDir by argParser.option(ArgType.String, PROJECT_DIR,
+            description = "base directory for relative libraryPath")
     val kotlincOption by argParser.option(ArgType.String, "Xkotlinc-option",
             description = "additional kotlinc compiler option").multiple()
     val overrideKonanProperties by argParser.option(ArgType.String,

kotlin-native/Interop/StubGenerator/src/main/kotlin/org/jetbrains/kotlin/native/interop/gen/jvm/main.kt

@@ -45,6 +45,7 @@ import java.io.File
 import java.lang.IllegalArgumentException
 import java.nio.file.*
 import java.util.*
+import kotlin.io.path.absolutePathString
 
 data class InternalInteropOptions(val generated: String, val natives: String, val manifest: String? = null,
                                   val cstubsName: String? = null)
@@ -235,7 +236,12 @@ private fun processCLib(flavor: KotlinPlatform, cinteropArguments: CInteropArgum
     val excludedFunctions = def.config.excludedFunctions.toSet()
     val excludedMacros = def.config.excludedMacros.toSet()
     val staticLibraries = def.config.staticLibraries + cinteropArguments.staticLibrary.toTypedArray()
-    val libraryPaths = def.config.libraryPaths + cinteropArguments.libraryPath.toTypedArray()
+    val projectDir = cinteropArguments.projectDir
+    val libraryPaths = (def.config.libraryPaths + cinteropArguments.libraryPath).map {
+        if (projectDir == null || Paths.get(it).isAbsolute)
+            it
+        else Paths.get(projectDir, it).absolutePathString()
+    }
     val fqParts = (cinteropArguments.pkg ?: def.config.packageName)?.split('.')
             ?: defFile!!.name.split('.').reversed().drop(1)