From: Robie Basak <robie.basak@canonical.com>
Date: Sat, 20 Apr 2013 22:05:50 -0300
Subject: Fix ARM alignment problems

This is a temporary workaround. We avoid double alignment issues by using
memcpy to make sure that all doubles are aligned before accessing them.

Last-Update: 2013-03-15
---
 src/mongo/bson/bsonelement.h | 16 +++++++++++++++-
 src/mongo/db/key.cpp         |  2 +-
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git src/mongo/bson/bsonelement.h src/mongo/bson/bsonelement.h
index f094ab9..1ecb47f 100644
--- src/mongo/bson/bsonelement.h
+++ src/mongo/bson/bsonelement.h
@@ -17,7 +17,7 @@
 
 #pragma once
 
-#include <string.h> // strlen
+#include <string.h> // strlen, memcpy
 #include <string>
 #include <vector>
 
@@ -529,13 +529,27 @@ namespace mongo {
     }
 
     inline double BSONElement::numberDouble() const {
+#if defined(__arm__)
+        int int_result;
+        long long long_long_result;
+#endif
         switch( type() ) {
         case NumberDouble:
             return _numberDouble();
         case NumberInt:
+#if defined(__arm__)
+            memcpy(&int_result, value(), sizeof(int_result));
+            return int_result;
+#else
             return *reinterpret_cast< const int* >( value() );
+#endif
         case NumberLong:
+#if defined(__arm__)
+            memcpy(&long_long_result, value(), sizeof(long_long_result));
+            return (double)long_long_result;
+#else
             return (double) *reinterpret_cast< const long long* >( value() );
+#endif
         default:
             return 0;
         }
diff --git src/mongo/db/key.cpp src/mongo/db/key.cpp
index 3d9eaa7..95959d8 100644
--- src/mongo/db/key.cpp
+++ src/mongo/db/key.cpp
@@ -406,7 +406,7 @@ namespace mongo {
                     p += 8;
                     break;
                 case cdouble:
-                    b.append("", (double&) *p);
+                    b.append("", (reinterpret_cast< const PackedDouble& >(*p)).d);
                     p += sizeof(double);
                     break;
                 case cint:
