--- a/gcc/config/rs6000/linux.h	Tue May 25 18:58:51 2010 +0900
+++ b/gcc/config/rs6000/linux.h	Tue Mar 22 17:18:12 2011 +0900
@@ -1,7 +1,7 @@
 /* Definitions of target machine for GNU compiler,
    for PowerPC machines running Linux.
    Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003,
-   2004, 2005, 2006, 2007 Free Software Foundation, Inc.
+   2004, 2005, 2006, 2007, 2010, 2011 Free Software Foundation, Inc.
    Contributed by Michael Meissner (meissner@cygnus.com).
 
    This file is part of GCC.
@@ -20,9 +20,6 @@
    along with GCC; see the file COPYING3.  If not see
    <http://www.gnu.org/licenses/>.  */
 
-#undef MD_EXEC_PREFIX
-#undef MD_STARTFILE_PREFIX
-
 /* Linux doesn't support saving and restoring 64-bit regs in a 32-bit
    process.  */
 #define OS_MISSING_POWERPC64 1
@@ -30,6 +27,12 @@
 /* We use glibc _mcount for profiling.  */
 #define NO_PROFILE_COUNTERS 1
 
+#ifdef SINGLE_LIBC
+#define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
+#else
+#define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
+#endif
+
 /* glibc has float and long double forms of math functions.  */
 #undef  TARGET_C99_FUNCTIONS
 #define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
@@ -111,8 +114,6 @@
 #define RELOCATABLE_NEEDS_FIXUP \
   (target_flags & target_flags_explicit & MASK_RELOCATABLE)
 
-#define TARGET_ASM_FILE_END file_end_indicate_exec_stack
-
 #define TARGET_POSIX_IO
 
 #define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
@@ -128,3 +129,6 @@
 #ifdef TARGET_DEFAULT_LONG_DOUBLE_128
 #define RS6000_DEFAULT_LONG_DOUBLE_SIZE 128
 #endif
+
+/* Static stack checking is supported by means of probes.  */
+#define STACK_CHECK_STATIC_BUILTIN 1