configure.in (--enable-new-gxx-abi): New option.

	* configure.in (--enable-new-gxx-abi): New option.
	* acconfig.h (ENABLE_NEW_GXX_ABI): New define.
	* Makefile.in (GXX_ABI_FLAG): New variable.
	* configure: Regenerate.

From-SVN: r31387

gcc/Makefile.in

@@ -164,6 +164,9 @@ GCC_FOR_TARGET = ./xgcc -B$(build_tooldir)/bin/ -B./ -I$(build_tooldir)/include
 # It also specifies -I./include to find, e.g., stddef.h.
 GCC_CFLAGS=$(INTERNAL_CFLAGS) $(X_CFLAGS) $(T_CFLAGS) $(CFLAGS) -I./include $(TCFLAGS)
 
+# Specify the abi to use when building the c++ runtime
+GXX_ABI_FLAG=@GXX_ABI_FLAG@
+
 # Sed command to transform gcc to installed name.  Overwritten by configure.
 program_transform_name = @program_transform_name@
 program_transform_cross_name = s,^,$(target_alias)-,

gcc/acconfig.h

@@ -4,6 +4,9 @@
 /* Define if printf supports "%p".  */
 #undef HAVE_PRINTF_PTR
 
+/* Define if you want to always select the new-abi for g++.  */
+#undef ENABLE_NEW_GXX_ABI
+
 /* Define if you want more run-time sanity checks.  This one gets a grab
    bag of miscellaneous but relatively cheap checks.  */
 #undef ENABLE_CHECKING

gcc/configure.in

@@ -4588,6 +4588,18 @@ fi])
 AC_SUBST(GGC)
 echo "Using $GGC for garbage collection."
 
+# Build a new-abi (c++) system
+AC_ARG_ENABLE(new-gxx-abi,
+[  --enable-new-gxx-abi
+			  select the new abi for g++. You must select an ABI
+			  at configuration time, so that the correct runtime
+			  support is built. You cannot mix ABIs.],
+[AC_DEFINE(ENABLE_NEW_GXX_ABI)
+GXX_ABI_FLAG='-fnew-abi'
+echo "Building a new-abi g++ compiler."
+])
+AC_SUBST(GXX_ABI_FLAG)
+
 # Make empty files to contain the specs and options for each language.
 # Then add #include lines to for a compiler that has specs and/or options.