Support linux/arm64.

shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ClangArgs.kt

@@ -39,6 +39,12 @@ class ClangArgs(private val configurables: Configurables) : Configurables by con
                             "-I$absoluteTargetSysRoot/usr/include/c++/4.8.3",
                             "-I$absoluteTargetSysRoot/usr/include/c++/4.8.3/arm-linux-gnueabihf")
 
+                KonanTarget.LINUX_ARM64 ->
+                    listOf("-target", targetArg!!,
+                            "--sysroot=$absoluteTargetSysRoot",
+                            "-I$absoluteTargetSysRoot/usr/include/c++/7",
+                            "-I$absoluteTargetSysRoot/usr/include/c++/7/aarch64-linux-gnu")
+
                 KonanTarget.LINUX_MIPS32 ->
                     listOf("-target", targetArg!!,
                             "--sysroot=$absoluteTargetSysRoot",
@@ -137,6 +143,13 @@ class ClangArgs(private val configurables: Configurables) : Configurables by con
                         "-DELFSIZE=32",
                         "-DKONAN_NO_UNALIGNED_ACCESS=1")
 
+            KonanTarget.LINUX_ARM64 ->
+                listOf("-DUSE_GCC_UNWIND=1",
+                        "-DKONAN_LINUX=1",
+                        "-DKONAN_ARM64=1",
+                        "-DUSE_ELF_SYMBOLS=1",
+                        "-DELFSIZE=64")
+
             KonanTarget.LINUX_MIPS32 ->
                 listOf("-DUSE_GCC_UNWIND=1",
                         "-DKONAN_LINUX=1",

shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/ConfigurablesImpl.kt

@@ -38,7 +38,7 @@ class ZephyrConfigurablesImpl(target: KonanTarget, properties: Properties, baseD
 
 
 fun loadConfigurables(target: KonanTarget, properties: Properties, baseDir: String?) = when (target)  {
-        KonanTarget.LINUX_X64, KonanTarget.LINUX_ARM32_HFP ->
+        KonanTarget.LINUX_X64, KonanTarget.LINUX_ARM32_HFP, KonanTarget.LINUX_ARM64 ->
             LinuxConfigurablesImpl(target, properties, baseDir)
         KonanTarget.LINUX_MIPS32, KonanTarget.LINUX_MIPSEL32 ->
             LinuxMIPSConfigurablesImpl(target, properties, baseDir)

shared/src/main/kotlin/org/jetbrains/kotlin/konan/target/KonanTarget.kt

@@ -53,6 +53,7 @@ sealed class KonanTarget(override val name: String, val family: Family, val arch
     object MINGW_X86 :      KonanTarget( "mingw_x86",       Family.MINGW,   Architecture.X86)
     object MINGW_X64 :      KonanTarget( "mingw_x64",       Family.MINGW,   Architecture.X64)
     object MACOS_X64 :      KonanTarget( "macos_x64",       Family.OSX,     Architecture.X64)
+    object LINUX_ARM64 :    KonanTarget( "linux_arm64",     Family.LINUX,   Architecture.ARM64)
     object LINUX_ARM32_HFP :KonanTarget( "linux_arm32_hfp", Family.LINUX,   Architecture.ARM32)
     object LINUX_MIPS32 :   KonanTarget( "linux_mips32",    Family.LINUX,   Architecture.MIPS32)
     object LINUX_MIPSEL32 : KonanTarget( "linux_mipsel32",  Family.LINUX,   Architecture.MIPSEL32)
@@ -135,7 +136,7 @@ open class HostManager(protected val distribution: Distribution = Distribution()
     private val predefinedTargets = listOf(
             ANDROID_ARM32, ANDROID_ARM64,
             IOS_ARM32, IOS_ARM64, IOS_X64,
-            LINUX_X64, LINUX_ARM32_HFP, LINUX_MIPS32, LINUX_MIPSEL32,
+            LINUX_X64, LINUX_ARM32_HFP, LINUX_ARM64, LINUX_MIPS32, LINUX_MIPSEL32,
             MINGW_X64, MINGW_X86,
             MACOS_X64,
             WASM32)
@@ -177,6 +178,7 @@ open class HostManager(protected val distribution: Distribution = Distribution()
         LINUX_X64 to setOf(
             LINUX_X64,
             LINUX_ARM32_HFP,
+            LINUX_ARM64,
             LINUX_MIPS32,
             LINUX_MIPSEL32,
             ANDROID_ARM32,
@@ -188,6 +190,7 @@ open class HostManager(protected val distribution: Distribution = Distribution()
             MINGW_X86,
             LINUX_X64,
             LINUX_ARM32_HFP,
+            LINUX_ARM64,
             ANDROID_ARM32,
             // TODO: toolchain to be fixed for that to work.
             // ANDROID_ARM64,
@@ -200,6 +203,7 @@ open class HostManager(protected val distribution: Distribution = Distribution()
             IOS_X64,
             LINUX_X64,
             LINUX_ARM32_HFP,
+            LINUX_ARM64,
             ANDROID_ARM32,
             ANDROID_ARM64,
             WASM32

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

@@ -253,7 +253,7 @@ open class LinuxBasedLinker(targetProperties: LinuxBasedConfigurables)
 
     private val ar = if (HostManager.hostIsMac) "$absoluteTargetToolchain/bin/llvm-ar"
         else "$absoluteTargetToolchain/bin/ar"
-    override val libGcc: String = "$absoluteTargetSysRoot/${super.libGcc}"
+    override val libGcc = "$absoluteTargetSysRoot/${super.libGcc}"
     private val linker = "$absoluteLlvmHome/bin/ld.lld"
     private val specificLibs = abiSpecificLibraries.map { "-L${absoluteTargetSysRoot}/$it" }
 
@@ -268,6 +268,7 @@ open class LinuxBasedLinker(targetProperties: LinuxBasedConfigurables)
 
         val isMips = (configurables is LinuxMIPSConfigurables)
         val dynamic = kind == LinkerOutputKind.DYNAMIC_LIBRARY
+        val crtPrefix = if (configurables.target == KonanTarget.LINUX_ARM64) "usr/lib" else "usr/lib64"
         // TODO: Can we extract more to the konan.configurables?
         return listOf(Command(linker).apply {
             +"--sysroot=${absoluteTargetSysRoot}"
@@ -280,8 +281,8 @@ open class LinuxBasedLinker(targetProperties: LinuxBasedConfigurables)
             +dynamicLinker
             +"-o"
             +executable
-            if (!dynamic) +"$absoluteTargetSysRoot/usr/lib64/crt1.o"
+            if (!dynamic) +"$absoluteTargetSysRoot/$crtPrefix/crt1.o"
-            +"$absoluteTargetSysRoot/usr/lib64/crti.o"
+            +"$absoluteTargetSysRoot/$crtPrefix/crti.o"
             +if (dynamic) "$libGcc/crtbeginS.o" else "$libGcc/crtbegin.o"
             +"-L$llvmLib"
             +"-L$libGcc"
@@ -296,7 +297,7 @@ open class LinuxBasedLinker(targetProperties: LinuxBasedConfigurables)
             +listOf("-lgcc", "--as-needed", "-lgcc_s", "--no-as-needed",
                     "-lc", "-lgcc", "--as-needed", "-lgcc_s", "--no-as-needed")
             +if (dynamic) "$libGcc/crtendS.o" else "$libGcc/crtend.o"
-            +"$absoluteTargetSysRoot/usr/lib64/crtn.o"
+            +"$absoluteTargetSysRoot/$crtPrefix/crtn.o"
             +libraries
             +linkerArgs
         })
@@ -408,7 +409,7 @@ open class ZephyrLinker(targetProperties: ZephyrConfigurables)
 
 fun linker(configurables: Configurables): LinkerFlags =
         when (configurables.target) {
-            KonanTarget.LINUX_X64, KonanTarget.LINUX_ARM32_HFP ->
+            KonanTarget.LINUX_X64, KonanTarget.LINUX_ARM32_HFP,  KonanTarget.LINUX_ARM64 ->
                 LinuxBasedLinker(configurables as LinuxConfigurables)
             KonanTarget.LINUX_MIPS32, KonanTarget.LINUX_MIPSEL32 ->
                 LinuxBasedLinker(configurables as LinuxMIPSConfigurables)