diff --git a/Makefile.in b/Makefile.in
index e51ab8e..5b4781b 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -63,6 +63,7 @@ SED := @GSED@
 PATH := $(INSTALL_DIR)/bin:$(PATH)
 DEBUG_INFO := @debug_info@
 DEBUG_INFO_GLIBC := @debug_info_glibc@
+COMPAT_TESTS := @compat_tests@
 
 # Check to see if we need wrapper scripts for awk/sed (which point to
 # gawk/gsed on platforms where these aren't the default), otherwise
@@ -155,6 +156,81 @@ endif
 SIM_PATH:=$(srcdir)/scripts/wrapper/$(SIM)
 SIM_PREPARE:=PATH="$(SIM_PATH):$(INSTALL_DIR)/bin:$(PATH)" ARC_SYSROOT="$(SYSROOT)" DEJAGNU="$(srcdir)/dejagnu/site.exp" QEMU_CPU="$(QEMU_CPU)"
 
+ifeq ($(COMPAT_TESTS),--enable-compat-tests)
+ifeq (@default_target@, linux)
+	$(error Default target cannot be set to Linux when running compatibility tests)
+endif
+
+# Default compatibility test flags
+# ALT is by default ccac
+GCC_COMMON_OPTS:=-O0 -g -Wl,-zmuldefs -Wl,--no-warn-mismatch -lgcc -lnsim -lg -lm
+CCAC_COMMON_OPTS:=-O0 -g -Xbasecase -Hnocopyr -Hnosdata -fstrict-abi
+#  ArcV2
+ifeq (@target_alias@,arc)
+	ifeq ($(WITH_CPU),--with-cpu=archs)
+		GCC_METAWARE_LIB:=arc/lib/av2hs/le
+		GCC_COMPAT_GCC_OPTIONS_DEFAULT:=-mcpu=archs -mno-sdata
+		GCC_COMPAT_CCAC_OPTIONS_DEFAULT:=-av2hs
+	else
+		GCC_METAWARE_LIB:=arc/lib/av2em/le
+		GCC_COMPAT_GCC_OPTIONS_DEFAULT:=-mcpu=em4_dmips -mno-sdata -fshort-enums
+		GCC_COMPAT_CCAC_OPTIONS_DEFAULT:=-av2em
+	endif
+else
+#  hs5x
+ifeq (@target_alias@,arc32)
+	GCC_METAWARE_LIB:=arc/lib/av3hs/le
+	GCC_COMPAT_GCC_OPTIONS_DEFAULT:=-mcpu=hs5x
+	GCC_COMPAT_CCAC_OPTIONS_DEFAULT:=-arcv3hs
+
+#  hs6x
+else
+	GCC_METAWARE_LIB:=arc/lib/arc64/le
+	GCC_COMPAT_GCC_OPTIONS_DEFAULT:= -mcpu=hs6x
+	GCC_COMPAT_CCAC_OPTIONS_DEFAULT:=-arc64
+endif
+endif
+
+GCC_COMPAT_GCC_OPTIONS_DEFAULT:=$(GCC_COMMON_OPTS) $(GCC_COMPAT_GCC_OPTIONS_DEFAULT)
+GCC_COMPAT_CCAC_OPTIONS_DEFAULT:=$(CCAC_COMMON_OPTS) $(GCC_COMPAT_CCAC_OPTIONS_DEFAULT)
+
+# Check for GCC compat flags
+ifndef GCC_COMPAT_GCC_OPTIONS
+	GCC_COMPAT_GCC_OPTIONS:=$(GCC_COMPAT_GCC_OPTIONS_DEFAULT)
+endif
+
+# Check for added GCC compat flags (so we can add to the defaults)
+ifdef GCC_COMPAT_EXTRA_GCC_OPTIONS
+	GCC_COMPAT_GCC_OPTIONS:=$(GCC_COMPAT_GCC_OPTIONS) $(GCC_COMPAT_EXTRA_GCC_OPTIONS)
+endif
+
+# Use alternate if available
+ifdef GCC_COMPAT_ALT_PATH
+
+	# We can use some defaults for MetaWares' CCAC
+	ifeq ($(shell echo $(GCC_COMPAT_ALT_PATH) | grep -q ccac && echo 1 || echo 0), 1)
+		ifndef GCC_COMPAT_ALT_OPTIONS
+			GCC_COMPAT_ALT_OPTIONS:=$(GCC_COMPAT_CCAC_OPTIONS_DEFAULT)
+		endif
+
+		# Default to use metaware libraries if available
+		ifdef GCC_METAWARE_ROOT
+			GCC_COMPAT_GCC_OPTIONS:=$(GCC_COMPAT_GCC_OPTIONS) -L$(GCC_METAWARE_ROOT)/$(GCC_METAWARE_LIB) -lmw
+		endif
+	endif
+	ALT_CC_UNDER_TEST:=$(GCC_COMPAT_ALT_PATH)
+
+	SIM_PREPARE := ALT_CC_UNDER_TEST="$(ALT_CC_UNDER_TEST)" GCC_COMPAT_ALT_OPTIONS="$(GCC_COMPAT_ALT_OPTIONS)" GCC_COMPAT_GCC_OPTIONS="$(GCC_COMPAT_GCC_OPTIONS)" $(SIM_PREPARE)
+
+# No alternate compiler provided, do self sanity checks
+else
+
+	ALT_CC_UNDER_TEST:="same"
+	SIM_PREPARE := ALT_CC_UNDER_TEST="$(ALT_CC_UNDER_TEST)" GCC_COMPAT_GCC_OPTIONS="$(GCC_COMPAT_GCC_OPTIONS)" $(SIM_PREPARE)
+
+endif
+endif
+
 all: @default_target@ @qemu_build@
 	echo "$(INSTALL_DIR)" > stamps/install_dir
 baremetal: stamps/build-gcc-newlib-stage2
@@ -177,6 +253,7 @@ check-baremetal: $(patsubst %,check-%-baremetal,$(REGRESSION_TEST_LIST))
 
 check-gcc: check-gcc-@default_target@
 check-gcc-baremetal: stamps/check-gcc-baremetal
+check-gcc-compat: stamps/check-gcc-compat
 check-gcc-linux: stamps/check-gcc-linux
 
 check-binutils: check-binutils-@default_target@
diff --git a/configure.ac b/configure.ac
index 692453b..11d5d23 100644
--- a/configure.ac
+++ b/configure.ac
@@ -153,6 +153,16 @@ AS_IF([test "x$enable_gcc_checking" != xno],
 	[AC_SUBST(gcc_checking, --enable-checking=yes)],
 	[AC_SUBST(gcc_checking, --enable-checking=release)])
 
+AC_ARG_ENABLE(compat-tests,
+        [AS_HELP_STRING([--enable-compat-tests],
+		[Enable gcc compatibility tests, Linux toolchain is not supported @<:@--disable-compact-tests@:>@])],
+        [],
+        [enable_compat_tests=no]
+        )
+AS_IF([test "x$enable_compat_tests" != xno],
+	[AC_SUBST(compat_tests, --enable-compat-tests)],
+	[AC_SUBST(compat_tests, --disable-compat-tests)])
+
 AC_ARG_WITH(cmodel,
 	[AS_HELP_STRING([--with-cmodel],
 		[Select the code model to use when building libc and libgcc @<:@--with-cmodel=medlow@:>@])],
diff --git a/dejagnu/site.exp b/dejagnu/site.exp
index 71c3539..e955f35 100644
--- a/dejagnu/site.exp
+++ b/dejagnu/site.exp
@@ -34,4 +34,24 @@ if ![ info exists HOSTCFLAGS ] {
     set HOSTCFLAGS "-g -O2"
 }
 
+if { [info exists env(GCC_COMPAT_GCC_OPTIONS)] } {
+    set is_gcc_compat_suite "1"
+    set GCC_COMPAT_GCC_OPTIONS $env(GCC_COMPAT_GCC_OPTIONS)
+
+    set ALT_CC_UNDER_TEST   "$env(ALT_CC_UNDER_TEST)"
+    set ALT_CXX_UNDER_TEST	"$ALT_CC_UNDER_TEST"
+
+    # MetaWare specs are defined
+    if { [info exists env(GCC_COMPAT_ALT_OPTIONS)] } {
+        set GCC_COMPAT_ALT_OPTIONS $env(GCC_COMPAT_ALT_OPTIONS)
+
+        set COMPAT_OPTIONS [list [list $GCC_COMPAT_GCC_OPTIONS $GCC_COMPAT_ALT_OPTIONS]]
+
+    # No MetaWare specs, perform sanity (self) compatibility checks
+    } else {
+        set COMPAT_OPTIONS [list [list $GCC_COMPAT_GCC_OPTIONS $GCC_COMPAT_GCC_OPTIONS]]
+
+    }
+}
+
 # vim: noexpandtab sts=4 ts=8: