nixpkgs/pkgs/development/libraries/boost/clang-math-2.patch

From 6bb71fdd8f7cc346d90fb14beb38b7297fc1ffd9 Mon Sep 17 00:00:00 2001
From: Andrey Semashev <andrey.semashev@gmail.com>
Date: Sun, 26 Jan 2014 13:58:48 +0400
Subject: [PATCH] Fixed incorrect initialization of 128-bit values, when no
 native support for 128-bit integers is available.

---
 boost/atomic/detail/cas128strong.hpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/boost/atomic/detail/cas128strong.hpp b/boost/atomic/detail/cas128strong.hpp
index 906c13e..dcb4d7d 100644
--- a/boost/atomic/detail/cas128strong.hpp
+++ b/boost/atomic/detail/cas128strong.hpp
@@ -196,15 +196,17 @@ class base_atomic<T, void, 16, Sign>
 
 public:
     BOOST_DEFAULTED_FUNCTION(base_atomic(void), {})
-    explicit base_atomic(value_type const& v) BOOST_NOEXCEPT : v_(0)
+    explicit base_atomic(value_type const& v) BOOST_NOEXCEPT
     {
+        memset(&v_, 0, sizeof(v_));
         memcpy(&v_, &v, sizeof(value_type));
     }
 
     void
     store(value_type const& value, memory_order order = memory_order_seq_cst) volatile BOOST_NOEXCEPT
     {
-        storage_type value_s = 0;
+        storage_type value_s;
+        memset(&value_s, 0, sizeof(value_s));
         memcpy(&value_s, &value, sizeof(value_type));
         platform_fence_before_store(order);
         platform_store128(value_s, &v_);
@@ -247,7 +249,9 @@ class base_atomic<T, void, 16, Sign>
         memory_order success_order,
         memory_order failure_order) volatile BOOST_NOEXCEPT
     {
-        storage_type expected_s = 0, desired_s = 0;
+        storage_type expected_s, desired_s;
+        memset(&expected_s, 0, sizeof(expected_s));
+        memset(&desired_s, 0, sizeof(desired_s));
         memcpy(&expected_s, &expected, sizeof(value_type));
         memcpy(&desired_s, &desired, sizeof(value_type));