1 files changed, 15 insertions, 1 deletions
diff --git a/boost/functional/hash/detail/hash_float.hpp b/boost/functional/hash/detail/hash_float.hpp
index ea1bc25f48..194be1cae5 100644
--- a/boost/functional/hash/detail/hash_float.hpp
+++ b/boost/functional/hash/detail/hash_float.hpp
@@ -87,9 +87,23 @@ namespace boost
     namespace hash_detail
     {
         template <class T>
+        inline bool is_zero(T v)
+        {
+#if !defined(__GNUC__)
+            return v == 0;
+#else
+            // GCC's '-Wfloat-equal' will complain about comparing
+            // v to 0, but because it disables warnings for system
+            // headers it won't complain if you use std::equal_to to
+            // compare with 0. Resulting in this silliness:
+            return std::equal_to<T>()(v, 0);
+#endif
+        }
+
+        template <class T>
         inline std::size_t float_hash_value(T v)
         {
-            return v == 0 ? 0 : float_hash_impl(v);
+            return boost::hash_detail::is_zero(v) ? 0 : float_hash_impl(v);
         }
     }
 }