--- a/gcc/config/rs6000/linux.h	Sun Aug 21 07:07:55 2011 +0900
+++ b/gcc/config/rs6000/linux.h	Fri Oct 27 22:46:09 2017 +0900
@@ -1,7 +1,6 @@
 /* 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, 2010, 2011 Free Software Foundation, Inc.
+   Copyright (C) 1996-2017 Free Software Foundation, Inc.
    Contributed by Michael Meissner (meissner@cygnus.com).
 
    This file is part of GCC.
@@ -29,17 +28,22 @@
 
 #ifdef SINGLE_LIBC
 #define OPTION_GLIBC  (DEFAULT_LIBC == LIBC_GLIBC)
+#define OPTION_UCLIBC (DEFAULT_LIBC == LIBC_UCLIBC)
+#define OPTION_BIONIC (DEFAULT_LIBC == LIBC_BIONIC)
+#undef OPTION_MUSL
+#define OPTION_MUSL   (DEFAULT_LIBC == LIBC_MUSL)
 #else
 #define OPTION_GLIBC  (linux_libc == LIBC_GLIBC)
+#define OPTION_UCLIBC (linux_libc == LIBC_UCLIBC)
+#define OPTION_BIONIC (linux_libc == LIBC_BIONIC)
+#undef OPTION_MUSL
+#define OPTION_MUSL   (linux_libc == LIBC_MUSL)
 #endif
 
-/* glibc has float and long double forms of math functions.  */
-#undef  TARGET_C99_FUNCTIONS
-#define TARGET_C99_FUNCTIONS (OPTION_GLIBC)
-
-/* Whether we have sincos that follows the GNU extension.  */
-#undef  TARGET_HAS_SINCOS
-#define TARGET_HAS_SINCOS (OPTION_GLIBC)
+/* Determine what functions are present at the runtime;
+   this includes full c99 runtime and sincos.  */
+#undef TARGET_LIBC_HAS_FUNCTION
+#define TARGET_LIBC_HAS_FUNCTION linux_libc_has_function
 
 #undef  TARGET_OS_CPP_BUILTINS
 #define TARGET_OS_CPP_BUILTINS()		\
@@ -56,14 +60,9 @@
 #undef	CPP_OS_DEFAULT_SPEC
 #define CPP_OS_DEFAULT_SPEC "%(cpp_os_linux)"
 
-/* The GNU C++ standard library currently requires _GNU_SOURCE being
-   defined on glibc-based systems. This temporary hack accomplishes this,
-   it should go away as soon as libstdc++-v3 has a real fix.  */
-#undef  CPLUSPLUS_CPP_SPEC
-#define CPLUSPLUS_CPP_SPEC "-D_GNU_SOURCE %(cpp)"
-
 #undef  LINK_SHLIB_SPEC
-#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}}"
+#define LINK_SHLIB_SPEC "%{shared:-shared} %{!shared: %{static:-static}} \
+  %{static-pie:-static -pie --no-dynamic-linker -z text}"
 
 #undef	LIB_DEFAULT_SPEC
 #define LIB_DEFAULT_SPEC "%(lib_linux)"
@@ -80,24 +79,24 @@
 #undef	LINK_OS_DEFAULT_SPEC
 #define LINK_OS_DEFAULT_SPEC "%(link_os_linux)"
 
-#define LINK_GCC_C_SEQUENCE_SPEC \
-  "%{static:--start-group} %G %L %{static:--end-group}%{!static:%G}"
-
-/* Use --as-needed -lgcc_s for eh support.  */
-#ifdef HAVE_LD_AS_NEEDED
-#define USE_LD_AS_NEEDED 1
+#undef  DEFAULT_ASM_ENDIAN
+#if (TARGET_DEFAULT & MASK_LITTLE_ENDIAN)
+#define DEFAULT_ASM_ENDIAN " -mlittle"
+#define LINK_OS_LINUX_EMUL ENDIAN_SELECT(" -m elf32ppclinux",	\
+					 " -m elf32lppclinux",	\
+					 " -m elf32lppclinux")
+#else
+#define DEFAULT_ASM_ENDIAN " -mbig"
+#define LINK_OS_LINUX_EMUL ENDIAN_SELECT(" -m elf32ppclinux",	\
+					 " -m elf32lppclinux",	\
+					 " -m elf32ppclinux")
 #endif
 
-#undef  TARGET_VERSION
-#define TARGET_VERSION fprintf (stderr, " (PowerPC GNU/Linux)");
-
-/* Override rs6000.h definition.  */
-#undef  ASM_APP_ON
-#define ASM_APP_ON "#APP\n"
-
-/* Override rs6000.h definition.  */
-#undef  ASM_APP_OFF
-#define ASM_APP_OFF "#NO_APP\n"
+#undef LINK_OS_LINUX_SPEC
+#define LINK_OS_LINUX_SPEC LINK_OS_LINUX_EMUL " %{!shared: %{!static: \
+  %{!static-pie: \
+    %{rdynamic:-export-dynamic} \
+    -dynamic-linker " GNU_USER_DYNAMIC_LINKER "}}}"
 
 /* For backward compatibility, we must continue to use the AIX
    structure return convention.  */
@@ -112,11 +111,7 @@
    -mrelocatable or -mrelocatable-lib is given.  */
 #undef RELOCATABLE_NEEDS_FIXUP
 #define RELOCATABLE_NEEDS_FIXUP \
-  (target_flags & target_flags_explicit & MASK_RELOCATABLE)
-
-#define TARGET_POSIX_IO
-
-#define MD_UNWIND_SUPPORT "config/rs6000/linux-unwind.h"
+  (rs6000_isa_flags & rs6000_isa_flags_explicit & OPTION_MASK_RELOCATABLE)
 
 #ifdef TARGET_LIBC_PROVIDES_SSP
 /* ppc32 glibc provides __stack_chk_guard in -0x7008(2).  */
@@ -132,3 +127,16 @@
 
 /* Static stack checking is supported by means of probes.  */
 #define STACK_CHECK_STATIC_BUILTIN 1
+
+/* Software floating point support for exceptions and rounding modes
+   depends on the C library in use.  */
+#undef TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P
+#define TARGET_FLOAT_EXCEPTIONS_ROUNDING_SUPPORTED_P \
+  rs6000_linux_float_exceptions_rounding_supported_p
+
+/* Support for TARGET_ATOMIC_ASSIGN_EXPAND_FENV without FPRs depends
+   on glibc 2.19 or greater.  */
+#if TARGET_GLIBC_MAJOR > 2 \
+  || (TARGET_GLIBC_MAJOR == 2 && TARGET_GLIBC_MINOR >= 19)
+#define RS6000_GLIBC_ATOMIC_FENV 1
+#endif