Sync down FSF r184235@google/gcc-4_6_2-mobile branch

1) Get mostly new patches from FSF gcc-4.6 branch
2) Fix PR52129
3) Insert GNU-stack note for all ARM targets

Change-Id: I2b9926981210e517e4021242908074319a91d6bd

1 files changed, 24 insertions, 2 deletions

diff --git a/gcc-4.6/libstdc++-v3/src/hash_c++0x.cc b/gcc-4.6/libstdc++-v3/src/hash_c++0x.cc
index 852498df6..d68507454 100644
--- a/gcc-4.6/libstdc++-v3/src/hash_c++0x.cc
+++ b/gcc-4.6/libstdc++-v3/src/hash_c++0x.cc
@@ -1,6 +1,6 @@
 // std::hash definitions -*- C++ -*-
 
-// Copyright (C) 2010 Free Software Foundation, Inc.
+// Copyright (C) 2010, 2011 Free Software Foundation, Inc.
 //
 // This file is part of the GNU ISO C++ Library.  This library is free
 // software; you can redistribute it and/or modify it under the
@@ -30,5 +30,27 @@
 
 namespace std _GLIBCXX_VISIBILITY(default)
 {
-#include "hash-long-double-aux.cc"
+  _GLIBCXX_PURE size_t
+  hash<long double>::operator()(long double __val) const noexcept
+  {
+    // 0 and -0 both hash to zero.
+    if (__val == 0.0L)
+      return 0;
+
+    int __exponent;
+    __val = __builtin_frexpl(__val, &__exponent);
+    __val = __val < 0.0l ? -(__val + 0.5l) : __val;
+
+    const long double __mult = __SIZE_MAX__ + 1.0l;
+    __val *= __mult;
+
+    // Try to use all the bits of the mantissa (really necessary only
+    // on 32-bit targets, at least for 80-bit floating point formats).
+    const size_t __hibits = (size_t)__val;
+    __val = (__val - (long double)__hibits) * __mult;
+
+    const size_t __coeff = __SIZE_MAX__ / __LDBL_MAX_EXP__;
+
+    return __hibits + (size_t)__val + __coeff * __exponent;
+  }
 }