Move linker selection to konan.properties

kotlin-native/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/Configurables.kt

@@ -112,6 +112,11 @@ interface GccConfigurables : TargetableConfigurables, ClangFlags {
     val dynamicLinker get() = targetString("dynamicLinker")!!
     val abiSpecificLibraries get() = targetList("abiSpecificLibraries")
     val crtFilesLocation get() = targetString("crtFilesLocation")!!
+
+    val linker get() = hostTargetString("linker")
+    val linkerHostSpecificFlags get() = hostTargetList("linkerHostSpecificFlags")
+    val absoluteLinker get() = absolute(linker)
+
     val linkerGccFlags get() = targetList("linkerGccFlags")
 }
 

kotlin-native/shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/Linker.kt

@@ -337,17 +337,11 @@ class GccBasedLinker(targetProperties: GccConfigurables)
                                    needsProfileLibrary: Boolean, mimallocEnabled: Boolean): List<Command> {
         if (kind == LinkerOutputKind.STATIC_LIBRARY)
             return staticGnuArCommands(ar, executable, objectFiles, libraries)
-        // TODO: Control via properties.
-        val (linker, linkerSpecificFlags) = when {
-            HostManager.hostIsMac -> "$absoluteLlvmHome/bin/ld.lld" to listOf("--no-threads")
-            else -> "$absoluteTargetToolchain/bin/ld.gold" to emptyList()
-        }
-
         val isMips = target == KonanTarget.LINUX_MIPS32 || target == KonanTarget.LINUX_MIPSEL32
         val dynamic = kind == LinkerOutputKind.DYNAMIC_LIBRARY
         val crtPrefix = "$absoluteTargetSysRoot/$crtFilesLocation"
         // TODO: Can we extract more to the konan.configurables?
-        return listOf(Command(linker).apply {
+        return listOf(Command(absoluteLinker).apply {
             +"--sysroot=${absoluteTargetSysRoot}"
             +"-export-dynamic"
             +"-z"
@@ -355,8 +349,8 @@ class GccBasedLinker(targetProperties: GccConfigurables)
             +"--build-id"
             +"--eh-frame-hdr"
             +"-dynamic-linker"
-            linkerSpecificFlags.forEach { +it }
             +dynamicLinker
+            linkerHostSpecificFlags.forEach { +it }
             +"-o"
             +executable
             if (!dynamic) +"$crtPrefix/crt1.o"