Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc	(.../svn+ssh://meissner@gcc.gnu.org/svn/gcc/trunk/gcc/config.gcc)	(revision 223994)
+++ gcc/config.gcc	(.../gcc/config.gcc)	(working copy)
@@ -4044,7 +4044,7 @@ case "${target}" in
 		;;
 
 	powerpc*-*-* | rs6000-*-*)
-		supported_defaults="abi cpu cpu_32 cpu_64 float tune tune_32 tune_64"
+		supported_defaults="abi cpu cpu_32 cpu_64 float tune tune_32 tune_64 advance_toolchain"
 
 		for which in cpu cpu_32 cpu_64 tune tune_32 tune_64; do
 			eval "val=\$with_$which"
@@ -4091,6 +4091,56 @@ case "${target}" in
 			exit 1
 			;;
 		esac
+
+		if test "x$with_advance_toolchain" != x; then
+		    if test -d "/opt/$with_advance_toolchain/." -a \
+			-d "/opt/$with_advance_toolchain/bin/." -a \
+			-d "/opt/$with_advance_toolchain/include/."; then
+
+			tm_file="$tm_file ./advance-toolchain.h"
+			(at="/opt/$with_advance_toolchain"
+			 echo "/* Use Advance Toolchain $at */"
+			 echo
+			 echo "#ifndef USE_AT_INCLUDE_FILES"
+			 echo "#define USE_AT_INCLUDE_FILES 1"
+			 echo "#endif"
+			 echo
+			 echo "#if USE_AT_INCLUDE_FILES"
+			 echo "#undef  INCLUDE_EXTRA_SPEC"
+			 echo "#define INCLUDE_EXTRA_SPEC" \
+			      "\"-isystem $at/include\""
+			 echo "#endif"
+			 echo
+			 echo "#undef  LINK_OS_EXTRA_SPEC32"
+			 echo "#define LINK_OS_EXTRA_SPEC32" \
+			      "\"%(link_os_new_dtags)" \
+			      "-rpath $prefix/lib -rpath $at/lib" \
+			      "-L $prefix/lib -L $at/lib\""
+			 echo
+			 echo "#undef  LINK_OS_EXTRA_SPEC64"
+			 echo "#define LINK_OS_EXTRA_SPEC64" \
+			      "\"%(link_os_new_dtags)" \
+			      "-rpath $prefix/lib64 -rpath $at/lib64" \
+			      "-L $prefix/lib64 -L $at/lib64\""
+			 echo
+			 echo "#undef  LINK_OS_NEW_DTAGS_SPEC"
+			 echo "#define LINK_OS_NEW_DTAGS_SPEC" \
+			      "\"--enable-new-dtags\""
+			 echo
+			 echo "#undef  DYNAMIC_LINKER_PREFIX"
+			 echo "#define DYNAMIC_LINKER_PREFIX \"$at\""
+			 echo
+			 echo "#undef  MD_EXEC_PREFIX"
+			 echo "#define MD_EXEC_PREFIX \"$at/bin/\""
+			 echo
+			 echo "#undef  MD_STARTFILE_PREFIX"
+			 echo "#define MD_STARTFILE_PREFIX \"$at/lib/\"") \
+			    > advance-toolchain.h
+		    else
+			echo "Unknown advance-toolchain $with_advance_toolchain"
+			exit 1
+		    fi
+		fi
 		;;
 
 	s390*-*-*)
Index: gcc/config/rs6000/linux64.h
===================================================================
--- gcc/config/rs6000/linux64.h	(.../svn+ssh://meissner@gcc.gnu.org/svn/gcc/trunk/gcc/config/rs6000)	(revision 223994)
+++ gcc/config/rs6000/linux64.h	(.../gcc/config/rs6000)	(working copy)
@@ -207,7 +207,36 @@ extern int dot_symbols;
   { "asm_spec32",		ASM_SPEC32 },				\
   { "asm_spec64",		ASM_SPEC64 },				\
   { "link_os_linux_spec32",	LINK_OS_LINUX_SPEC32 },			\
-  { "link_os_linux_spec64",	LINK_OS_LINUX_SPEC64 },
+  { "link_os_linux_spec64",	LINK_OS_LINUX_SPEC64 },			\
+  { "link_os_extra_spec32",	LINK_OS_EXTRA_SPEC32 },			\
+  { "link_os_extra_spec64",	LINK_OS_EXTRA_SPEC64 },			\
+  { "link_os_new_dtags",	LINK_OS_NEW_DTAGS_SPEC },		\
+  { "include_extra",		INCLUDE_EXTRA_SPEC },			\
+  { "dynamic_linker_prefix",	DYNAMIC_LINKER_PREFIX },
+
+/* Optional specs used for overriding the system include directory, default
+   -rpath links, and prefix for the dynamic linker.  Normally, there are not
+   defined, but if the user configure with the --with-advance-toolchain=<xxx>
+   option, the advance-toolchain.h file will override these.  */
+#ifndef INCLUDE_EXTRA_SPEC
+#define INCLUDE_EXTRA_SPEC	""
+#endif
+
+#ifndef LINK_OS_EXTRA_SPEC32
+#define LINK_OS_EXTRA_SPEC32	""
+#endif
+
+#ifndef LINK_OS_EXTRA_SPEC64
+#define LINK_OS_EXTRA_SPEC64	""
+#endif
+
+#ifndef LINK_OS_NEW_DTAGS_SPEC
+#define LINK_OS_NEW_DTAGS_SPEC	""
+#endif
+
+#ifndef DYNAMIC_LINKER_PREFIX
+#define DYNAMIC_LINKER_PREFIX	""
+#endif
 
 #undef	MULTILIB_DEFAULTS
 #if DEFAULT_ARCH64_P
@@ -341,7 +370,7 @@ extern int dot_symbols;
   while (0)
 
 #undef  CPP_OS_DEFAULT_SPEC
-#define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
+#define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux) %(include_extra)"
 
 #undef  LINK_SHLIB_SPEC
 #define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
@@ -361,12 +390,18 @@ extern int dot_symbols;
 #undef	LINK_OS_DEFAULT_SPEC
 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 
-#define GLIBC_DYNAMIC_LINKER32 "/lib/ld.so.1"
+#define GLIBC_DYNAMIC_LINKER32 "%(dynamic_linker_prefix)/lib/ld.so.1"
+
 #ifdef LINUX64_DEFAULT_ABI_ELFv2
-#define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv1:/lib64/ld64.so.1;:/lib64/ld64.so.2}"
+#define GLIBC_DYNAMIC_LINKER64 \
+"%{mabi=elfv1:%(dynamic_linker_prefix)/lib64/ld64.so.1;" \
+":%(dynamic_linker_prefix)/lib64/ld64.so.2}"
 #else
-#define GLIBC_DYNAMIC_LINKER64 "%{mabi=elfv2:/lib64/ld64.so.2;:/lib64/ld64.so.1}"
+#define GLIBC_DYNAMIC_LINKER64 \
+"%{mabi=elfv2:%(dynamic_linker_prefix)/lib64/ld64.so.2;" \
+":%(dynamic_linker_prefix)/lib64/ld64.so.1}"
 #endif
+
 #define UCLIBC_DYNAMIC_LINKER32 "/lib/ld-uClibc.so.0"
 #define UCLIBC_DYNAMIC_LINKER64 "/lib/ld64-uClibc.so.0"
 #if DEFAULT_LIBC == LIBC_UCLIBC
@@ -402,11 +437,13 @@ extern int dot_symbols;
 
 #define LINK_OS_LINUX_SPEC32 LINK_OS_LINUX_EMUL32 " %{!shared: %{!static: \
   %{rdynamic:-export-dynamic} \
-  -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}}"
+  -dynamic-linker " GNU_USER_DYNAMIC_LINKER32 "}} \
+  %(link_os_extra_spec32)"
 
 #define LINK_OS_LINUX_SPEC64 LINK_OS_LINUX_EMUL64 " %{!shared: %{!static: \
   %{rdynamic:-export-dynamic} \
-  -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}}"
+  -dynamic-linker " GNU_USER_DYNAMIC_LINKER64 "}} \
+  %(link_os_extra_spec64)"
 
 #undef  TOC_SECTION_ASM_OP
 #define TOC_SECTION_ASM_OP \
Index: gcc/doc/install.texi
===================================================================
--- gcc/doc/install.texi	(.../svn+ssh://meissner@gcc.gnu.org/svn/gcc/trunk/gcc/doc)	(revision 223994)
+++ gcc/doc/install.texi	(.../gcc/doc)	(working copy)
@@ -1607,6 +1607,14 @@ should not be built.
 Specify that the compiler should
 use DWARF 2 debugging information as the default.
 
+@item --enable-advance-toolchain=@var{at}
+On 64-bit PowerPC Linux systems, configure the compiler to use the
+header files, library files, and the dynamic linker from the Advance
+Toolchain release @var{at} instead of the default versions that are
+provided by the Linux distribution.  In general, this option is
+intended for the developers of GCC, and it is not intended for general
+use.
+
 @item --enable-targets=all
 @itemx --enable-targets=@var{target_list}
 Some GCC targets, e.g.@: powerpc64-linux, build bi-arch compilers.