diff --git a/configure b/configure
index 036142a8d06..bf574efd1d8 100755
--- a/configure
+++ b/configure
@@ -19081,7 +19081,101 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++" >&5
+case $target in
+  *-*-darwin*)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++" >&5
+$as_echo_n "checking where to find the target c++... " >&6; }
+if test "x${build}" != "x${host}" ; then
+  if expr "x$CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  else
+    # Canadian cross, just use what we found
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+else
+  ok=yes
+  case " ${configdirs} " in
+    *" gcc "*) ;;
+    *) ok=no ;;
+  esac
+  case ,${enable_languages}, in
+    *,c++,*) ;;
+    *) ok=no ;;
+  esac
+  if test $ok = yes; then
+    # An in-tree tool is available and we can use it
+    CXX_FOR_TARGET='$$r/$(HOST_SUBDIR)/gcc/xg++ -B$$r/$(HOST_SUBDIR)/gcc/ -nostdinc++ `if test -f $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags; then $(SHELL) $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags --build-includes; else echo -funconfigured-libstdc++-v3 ; fi` -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: just compiled" >&5
+$as_echo "just compiled" >&6; }
+  elif expr "x$CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  elif test "x$target" = "x$host"; then
+    # We can use an host tool
+    CXX_FOR_TARGET='$(CXX)'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: host tool" >&5
+$as_echo "host tool" >&6; }
+  else
+    # We need a cross tool
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+fi
+
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++ for libstdc++" >&5
+$as_echo_n "checking where to find the target c++ for libstdc++... " >&6; }
+if test "x${build}" != "x${host}" ; then
+  if expr "x$RAW_CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $RAW_CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  else
+    # Canadian cross, just use what we found
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+else
+  ok=yes
+  case " ${configdirs} " in
+    *" gcc "*) ;;
+    *) ok=no ;;
+  esac
+  case ,${enable_languages}, in
+    *,c++,*) ;;
+    *) ok=no ;;
+  esac
+  if test $ok = yes; then
+    # An in-tree tool is available and we can use it
+    RAW_CXX_FOR_TARGET='$$r/$(HOST_SUBDIR)/gcc/xgcc -shared-libgcc -B$$r/$(HOST_SUBDIR)/gcc -nostdinc++ -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: just compiled" >&5
+$as_echo "just compiled" >&6; }
+  elif expr "x$RAW_CXX_FOR_TARGET" : "x/" > /dev/null; then
+    # We already found the complete path
+    ac_dir=`dirname $RAW_CXX_FOR_TARGET`
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed in $ac_dir" >&5
+$as_echo "pre-installed in $ac_dir" >&6; }
+  elif test "x$target" = "x$host"; then
+    # We can use an host tool
+    RAW_CXX_FOR_TARGET='$(CXX)'
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: host tool" >&5
+$as_echo "host tool" >&6; }
+  else
+    # We need a cross tool
+    { $as_echo "$as_me:${as_lineno-$LINENO}: result: pre-installed" >&5
+$as_echo "pre-installed" >&6; }
+  fi
+fi
+
+  ;;
+  *)
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++" >&5
 $as_echo_n "checking where to find the target c++... " >&6; }
 if test "x${build}" != "x${host}" ; then
   if expr "x$CXX_FOR_TARGET" : "x/" > /dev/null; then
@@ -19126,7 +19220,7 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++ for libstdc++" >&5
+    { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target c++ for libstdc++" >&5
 $as_echo_n "checking where to find the target c++ for libstdc++... " >&6; }
 if test "x${build}" != "x${host}" ; then
   if expr "x$RAW_CXX_FOR_TARGET" : "x/" > /dev/null; then
@@ -19171,6 +19265,8 @@ $as_echo "pre-installed" >&6; }
   fi
 fi
 
+  ;;
+esac
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking where to find the target dlltool" >&5
 $as_echo_n "checking where to find the target dlltool... " >&6; }
 if test "x${build}" != "x${host}" ; then
diff --git a/configure.ac b/configure.ac
index 6cf9893cab0..3e120b027e9 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4061,12 +4061,24 @@ GCC_TARGET_TOOL(ar, AR_FOR_TARGET, AR, [binutils/ar])
 GCC_TARGET_TOOL(as, AS_FOR_TARGET, AS, [gas/as-new])
 GCC_TARGET_TOOL(cc, CC_FOR_TARGET, CC, [gcc/xgcc -B$$r/$(HOST_SUBDIR)/gcc/])
 dnl see comments for CXX_FOR_TARGET_FLAG_TO_PASS
-GCC_TARGET_TOOL(c++, CXX_FOR_TARGET, CXX,
+case $target in
+  *-*-darwin*)
+    GCC_TARGET_TOOL(c++, CXX_FOR_TARGET, CXX,
+		[gcc/xg++ -B$$r/$(HOST_SUBDIR)/gcc/ -nostdinc++ `if test -f $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags; then $(SHELL) $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags --build-includes; else echo -funconfigured-libstdc++-v3 ; fi` -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
+		c++)
+    GCC_TARGET_TOOL(c++ for libstdc++, RAW_CXX_FOR_TARGET, CXX,
+		[gcc/xgcc -shared-libgcc -B$$r/$(HOST_SUBDIR)/gcc -nostdinc++ -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -B$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
+		c++)
+  ;;
+  *)
+    GCC_TARGET_TOOL(c++, CXX_FOR_TARGET, CXX,
 		[gcc/xg++ -B$$r/$(HOST_SUBDIR)/gcc/ -nostdinc++ `if test -f $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags; then $(SHELL) $$r/$(TARGET_SUBDIR)/libstdc++-v3/scripts/testsuite_flags --build-includes; else echo -funconfigured-libstdc++-v3 ; fi` -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
 		c++)
-GCC_TARGET_TOOL(c++ for libstdc++, RAW_CXX_FOR_TARGET, CXX,
+    GCC_TARGET_TOOL(c++ for libstdc++, RAW_CXX_FOR_TARGET, CXX,
 		[gcc/xgcc -shared-libgcc -B$$r/$(HOST_SUBDIR)/gcc -nostdinc++ -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/src/.libs -L$$r/$(TARGET_SUBDIR)/libstdc++-v3/libsupc++/.libs],
 		c++)
+  ;;
+esac
 GCC_TARGET_TOOL(dlltool, DLLTOOL_FOR_TARGET, DLLTOOL, [binutils/dlltool])
 GCC_TARGET_TOOL(dsymutil, DSYMUTIL_FOR_TARGET, DSYMUTIL)
 GCC_TARGET_TOOL(gcc, GCC_FOR_TARGET, , [gcc/xgcc -B$$r/$(HOST_SUBDIR)/gcc/])