Index: libgcc/config.host
===================================================================
--- libgcc/config.host	(revision 2572)
+++ libgcc/config.host	(working copy)
@@ -303,6 +303,14 @@
 	extra_parts="$extra_parts vms-dwarf2.o vms-dwarf2eh.o"
 	md_unwind_header=alpha/vms-unwind.h
 	;;
+arc-*-elf*)
+	tmake_file="arc/t-arc-newlib arc/t-arc"
+	extra_parts="crti.o crtn.o crtend.o crtbegin.o crtendS.o crtbeginS.o libgmon.a crtg.o crtgend.o"
+	;;
+arc*-*-linux-uclibc*)
+	tmake_file="${tmake_file} t-slibgcc-libgcc t-slibgcc-nolc-override arc/t-arc700-uClibc arc/t-arc"
+	extra_parts="crti.o crtn.o crtend.o crtbegin.o crtendS.o crtbeginS.o libgmon.a crtg.o crtgend.o"
+	;;
 arm-wrs-vxworks)
 	tmake_file="$tmake_file arm/t-arm arm/t-vxworks t-fdpbit"
 	extra_parts="$extra_parts crti.o crtn.o"
Index: gcc/testsuite/gcc.c-torture/execute/20101011-1.c
===================================================================
--- gcc/testsuite/gcc.c-torture/execute/20101011-1.c	(revision 2572)
+++ gcc/testsuite/gcc.c-torture/execute/20101011-1.c	(working copy)
@@ -36,6 +36,9 @@
 #elif defined (__CRIS__)
   /* No SIGFPE for CRIS integer division.  */
 # define DO_TEST 0
+#elif defined (__arc__)
+  /* No SIGFPE for ARC integer division.  */
+# define DO_TEST 0
 #elif defined (__arm__) && defined (__ARM_EABI__)
 # ifdef __ARM_ARCH_EXT_IDIV__
   /* Hardware division instructions may not trap, and handle trapping
Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc	(revision 2572)
+++ gcc/config.gcc	(working copy)
@@ -813,6 +813,39 @@
 	tm_file="${tm_file} vms/vms.h alpha/vms.h"
 	tmake_file="${tmake_file} alpha/t-vms"
 	;;
+arc-*-elf*)
+	extra_headers="arc-simd.h"
+	tm_file="dbxelf.h elfos.h newlib-stdint.h ${tm_file}"
+	tmake_file="arc/t-arc-newlib arc/t-arc"
+	case x"${with_cpu}" in
+	  xarc600|xarc601|xarc700)
+		target_cpu_default="TARGET_CPU_$with_cpu"
+		;;
+	esac
+	;;
+arc*-*-linux-uclibc*)
+	extra_headers="arc-simd.h"
+	tm_file="dbxelf.h elfos.h linux.h  ${tm_file}"
+	tmake_file="arc/t-arc-uClibc arc/t-arc"
+	case x"${with_cpu}" in
+	  xarc600|xarc601|xarc700)
+		target_cpu_default="TARGET_CPU_$with_cpu"
+		;;
+	esac
+	if test x${with_endian} = x; then
+		case ${target} in
+		arc*be-*-* | arc*eb-*-*)	with_endian=big ;;
+		*)				with_endian=little ;;
+		esac
+	fi
+	case ${with_endian} in
+	big|little)		;;
+	*)	echo "with_endian=${with_endian} not supported."; exit 1 ;;
+	esac
+	case ${with_endian} in
+	big*)	tm_defines="DRIVER_ENDIAN_SELF_SPECS=\\\"%{!EL:%{!mlittle-endian:-mbig-endian}}\\\" ${tm_defines}"
+	esac
+        ;;
 arm-wrs-vxworks)
 	tm_file="elfos.h arm/elf.h arm/aout.h ${tm_file} vx-common.h vxworks.h arm/vxworks.h"
 	extra_options="${extra_options} arm/vxworks.opt"
@@ -2976,6 +3009,17 @@
 		done
 		;;
 
+	arc*-*-*) # was:	arc*-*-linux-uclibc)
+		supported_defaults="cpu"
+		case $with_cpu in
+		  arc600|arc601|arc700)
+			;;
+		  *) echo "Unknown cpu type"
+			exit 1
+			;;
+		esac
+		;;
+
 	arm*-*-*)
 		supported_defaults="arch cpu float tune fpu abi mode tls"
 		for which in cpu tune; do
Index: libstdc++-v3/acinclude.m4
===================================================================
--- libstdc++-v3/acinclude.m4	(revision 2572)
+++ libstdc++-v3/acinclude.m4	(working copy)
@@ -2927,6 +2927,8 @@ void foo()
     if AC_TRY_EVAL(ac_compile); then
       if grep _Unwind_SjLj_Resume conftest.s >/dev/null 2>&1 ; then
 	enable_sjlj_exceptions=yes
+      elif grep _Unwind_SjLj_Register conftest.s >/dev/null 2>&1 ; then
+	enable_sjlj_exceptions=yes
       elif grep _Unwind_Resume conftest.s >/dev/null 2>&1 ; then
 	enable_sjlj_exceptions=no
       elif grep __cxa_end_cleanup conftest.s >/dev/null 2>&1 ; then