diff --git a/include/boost/geometry/algorithms/detail/sections/section_functions.hpp b/include/boost/geometry/algorithms/detail/sections/section_functions.hpp
index 44fb4665b..abc6de409 100644
--- a/include/boost/geometry/algorithms/detail/sections/section_functions.hpp
+++ b/include/boost/geometry/algorithms/detail/sections/section_functions.hpp
@@ -2,9 +2,8 @@
 
 // Copyright (c) 2015 Barend Gehrels, Amsterdam, the Netherlands.
 
-// This file was modified by Oracle on 2015, 2017, 2018.
-// Modifications copyright (c) 2015-2018, Oracle and/or its affiliates.
-
+// This file was modified by Oracle on 2015-2021.
+// Modifications copyright (c) 2015-2021, Oracle and/or its affiliates.
 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
 
 // Use, modification and distribution is subject to the Boost Software License,
@@ -132,9 +131,11 @@ static inline bool preceding(int dir,
                              RobustPolicy const& robust_policy)
 {
     typename geometry::robust_point_type<Point, RobustPolicy>::type robust_point;
-    assert_coordinate_type_equal(robust_point, point_box);
     geometry::recalculate(robust_point, point, robust_policy);
 
+    // After recalculate() to prevent warning: 'robust_point' may be used uninitialized
+    assert_coordinate_type_equal(robust_point, point_box);
+
     return preceding_check<Dimension, Box>::apply(dir, robust_point,
                                                     point_box,
                                                     other_box);
diff --git a/include/boost/geometry/algorithms/difference.hpp b/include/boost/geometry/algorithms/difference.hpp
index 64df80e77..2155b9e54 100644
--- a/include/boost/geometry/algorithms/difference.hpp
+++ b/include/boost/geometry/algorithms/difference.hpp
@@ -161,10 +161,10 @@ struct call_intersection_insert
         typename Strategy
     >
     static inline OutputIterator apply(Geometry1 const& geometry1,
-                                       Geometry2 const& geometry2,
-                                       RobustPolicy const& robust_policy,
+                                       Geometry2 const& ,
+                                       RobustPolicy const& ,
                                        OutputIterator out,
-                                       Strategy const& strategy)
+                                       Strategy const& )
     {
         base_t::access::get(out) = geometry::detail::convert_to_output
             <
diff --git a/include/boost/geometry/iterators/concatenate_iterator.hpp b/include/boost/geometry/iterators/concatenate_iterator.hpp
index d3266e975..42145ec25 100644
--- a/include/boost/geometry/iterators/concatenate_iterator.hpp
+++ b/include/boost/geometry/iterators/concatenate_iterator.hpp
@@ -86,6 +86,10 @@ public:
         , m_it2(other.m_it2)
     {}
 
+    concatenate_iterator(concatenate_iterator const& other) = default;
+
+    concatenate_iterator& operator=(concatenate_iterator const& other) = default;
+
 private:
     friend class boost::iterator_core_access;
 
diff --git a/include/boost/geometry/iterators/flatten_iterator.hpp b/include/boost/geometry/iterators/flatten_iterator.hpp
index 9b45d2efe..cfe232b4e 100644
--- a/include/boost/geometry/iterators/flatten_iterator.hpp
+++ b/include/boost/geometry/iterators/flatten_iterator.hpp
@@ -100,6 +100,8 @@ public:
           m_inner_it(other.m_inner_it)
     {}
 
+    flatten_iterator(flatten_iterator const& other) = default;
+
     flatten_iterator& operator=(flatten_iterator const& other)
     {
         m_outer_it = other.m_outer_it;
diff --git a/include/boost/geometry/srs/projections/factory.hpp b/include/boost/geometry/srs/projections/factory.hpp
index 0fddb0a27..156fece80 100644
--- a/include/boost/geometry/srs/projections/factory.hpp
+++ b/include/boost/geometry/srs/projections/factory.hpp
@@ -2,8 +2,8 @@
 
 // Copyright (c) 2008-2012 Barend Gehrels, Amsterdam, the Netherlands.
 
-// This file was modified by Oracle on 2017-2020.
-// Modifications copyright (c) 2017-2020, Oracle and/or its affiliates.
+// This file was modified by Oracle on 2017-2021.
+// Modifications copyright (c) 2017-2021, Oracle and/or its affiliates.
 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
 
 // Use, modification and distribution is subject to the Boost Software License,
@@ -145,7 +145,7 @@ struct factory_key<srs::detail::proj4_parameters>
     {
         return par.id.name;
     }
-    static const char* get(const char* name, srs::dpar::value_proj id)
+    static const char* get(const char* name, srs::dpar::value_proj )
     {
         return name;
     }
@@ -160,7 +160,7 @@ struct factory_key<srs::dpar::parameters<T> >
     {
         return par.id.id;
     }
-    static srs::dpar::value_proj get(const char* name, srs::dpar::value_proj id)
+    static srs::dpar::value_proj get(const char* , srs::dpar::value_proj id)
     {
         return id;
     }
diff --git a/include/boost/geometry/srs/projections/proj/igh.hpp b/include/boost/geometry/srs/projections/proj/igh.hpp
index 385ac3031..8e01151c8 100644
--- a/include/boost/geometry/srs/projections/proj/igh.hpp
+++ b/include/boost/geometry/srs/projections/proj/igh.hpp
@@ -2,8 +2,8 @@
 
 // Copyright (c) 2008-2015 Barend Gehrels, Amsterdam, the Netherlands.
 
-// This file was modified by Oracle on 2017, 2018, 2019.
-// Modifications copyright (c) 2017-2019, Oracle and/or its affiliates.
+// This file was modified by Oracle on 2017-2021.
+// Modifications copyright (c) 2017-2021, Oracle and/or its affiliates.
 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle.
 
 // Use, modification and distribution is subject to the Boost Software License,
@@ -287,7 +287,7 @@ namespace projections
 
             // Interrupted Goode Homolosine
             template <typename Params, typename Parameters, typename T>
-            inline void setup_igh(Params const& params, Parameters& par, par_igh<T, Parameters>& proj_parm)
+            inline void setup_igh(Params const& , Parameters& par, par_igh<T, Parameters>& proj_parm)
             {
                 static const T d0   =  0;
                 static const T d4044118 = igh::d4044118<T>();
diff --git a/test/concepts/point_spherical_with_wrong_units.cpp b/test/concepts/point_spherical_with_wrong_units.cpp
index 960db4a4d..3ee23d2ce 100644
--- a/test/concepts/point_spherical_with_wrong_units.cpp
+++ b/test/concepts/point_spherical_with_wrong_units.cpp
@@ -1,15 +1,17 @@
 // Boost.Geometry (aka GGL, Generic Geometry Library)
 // Unit Test
 
-// Copyright (c) 2014, Oracle and/or its affiliates.
-
+// Copyright (c) 2014-2021, Oracle and/or its affiliates.
 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
 
 // Licensed under the Boost Software License version 1.0.
 // http://www.boost.org/users/license.html
 
 #include <test_geometries/custom_lon_lat_point.hpp>
 
+#include <boost/core/ignore_unused.hpp>
+
 #include <boost/geometry/core/cs.hpp>
 #include <boost/geometry/geometries/point.hpp>
 #include <boost/geometry/geometries/concepts/check.hpp>
@@ -22,5 +24,7 @@ int main()
 {
     bg::model::point<double, 2, bg::cs::spherical_equatorial<double> > p;
 
+    boost::ignore_unused(p);
+
     return 0;
 }
diff --git a/test/core/coordinate_dimension.cpp b/test/core/coordinate_dimension.cpp
index 94a90bbfd..69291738a 100644
--- a/test/core/coordinate_dimension.cpp
+++ b/test/core/coordinate_dimension.cpp
@@ -3,6 +3,10 @@
 
 // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
 
+// This file was modified by Oracle on 2021.
+// Modifications copyright (c) 2021, Oracle and/or its affiliates.
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
 // Use, modification and distribution is subject to the Boost Software License,
 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
@@ -31,7 +35,7 @@ BOOST_GEOMETRY_REGISTER_LINESTRING_TEMPLATED(std::vector)
 BOOST_GEOMETRY_REGISTER_LINESTRING_TEMPLATED(std::deque)
 
 
-template <typename G, int Expected>
+template <typename G, size_t Expected>
 void test_geometry()
 {
     BOOST_CHECK_EQUAL(bg::dimension<G>::type::value, Expected);
@@ -66,9 +70,9 @@ int test_main(int, char* [])
     test_geometry<boost::tuple<double, double>, 2>();
     test_geometry<boost::tuple<double, double, double>, 3>();
 
-    test_all<bg::model::point<int, 2, bg::cs::cartesian>, 2 >();
-    test_all<bg::model::point<float, 2, bg::cs::cartesian>, 2 >();
-    test_all<bg::model::point<double, 2, bg::cs::cartesian>, 2 >();
+    test_all<bg::model::point<int, 2, bg::cs::cartesian>, 2>();
+    test_all<bg::model::point<float, 2, bg::cs::cartesian>, 2>();
+    test_all<bg::model::point<double, 2, bg::cs::cartesian>, 2>();
 
     return 0;
 }
diff --git a/test/cs_undefined/test_relops.hpp b/test/cs_undefined/test_relops.hpp
index 7a366bcd6..e9e2019b5 100644
--- a/test/cs_undefined/test_relops.hpp
+++ b/test/cs_undefined/test_relops.hpp
@@ -1,7 +1,6 @@
 // Boost.Geometry
 
-// Copyright (c) 2019, Oracle and/or its affiliates.
-
+// Copyright (c) 2019-2021, Oracle and/or its affiliates.
 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
 
 // Licensed under the Boost Software License version 1.0.
@@ -33,7 +32,7 @@ template
 struct call_equals
 {
     template <typename S>
-    static void apply(G1 const& g1, G2 const& g2, S const& s) {}
+    static void apply(G1 const& , G2 const& , S const& ) {}
 };
 
 template <typename G1, typename G2, std::size_t Dim>
@@ -56,7 +55,7 @@ template
 struct call_overlaps
 {
     template <typename S>
-    static void apply(G1 const& g1, G2 const& g2, S const& s) {}
+    static void apply(G1 const& , G2 const& , S const& ) {}
 };
 
 template <typename G1, typename G2, std::size_t Dim>
@@ -89,7 +88,7 @@ template <typename G1, typename G2>
 struct call_touches<G1, G2, 0, 0>
 {
     template <typename S>
-    static void apply(G1 const& g1, G2 const& g2, S const& s) {}
+    static void apply(G1 const& , G2 const& , S const& ) {}
 };
 
 template
@@ -112,14 +111,14 @@ template <typename G1, typename G2>
 struct call_crosses<G1, G2, 0, 0>
 {
     template <typename S>
-    static void apply(G1 const& g1, G2 const& g2, S const& s) {}
+    static void apply(G1 const& , G2 const& , S const& ) {}
 };
 
 template <typename G1, typename G2>
 struct call_crosses<G1, G2, 2, 2>
 {
     template <typename S>
-    static void apply(G1 const& g1, G2 const& g2, S const& s) {}
+    static void apply(G1 const& , G2 const& , S const& ) {}
 };
 
 template <typename G1, typename G2, typename S>
diff --git a/test/geometries/initialization.cpp b/test/geometries/initialization.cpp
index c71ae302b..491852075 100644
--- a/test/geometries/initialization.cpp
+++ b/test/geometries/initialization.cpp
@@ -3,8 +3,8 @@
 
 // Copyright (c) 2014-2015 Adam Wulkiewicz, Lodz, Poland.
 
-// This file was modified by Oracle on 2020.
-// Modifications copyright (c) 2020 Oracle and/or its affiliates.
+// This file was modified by Oracle on 2020-2021.
+// Modifications copyright (c) 2020-2021 Oracle and/or its affiliates.
 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
 
 // Use, modification and distribution is subject to the Boost Software License,
@@ -237,7 +237,7 @@ void test_sanity_check()
 
         V v = boost::assign::list_of(P(1, 1))(P(2, 2))(P(3, 3));
         //v = boost::assign::list_of(P(1, 1))(P(2, 2))(P(3, 3));
-        v.empty();
+        //v.empty();
     }
 }
 
diff --git a/test/geometries/polygon.cpp b/test/geometries/polygon.cpp
index bf9aeb337..a534746cf 100644
--- a/test/geometries/polygon.cpp
+++ b/test/geometries/polygon.cpp
@@ -3,6 +3,10 @@
 
 // Copyright (c) 2020 Digvijay Janartha, Hamirpur, India.
 
+// This file was modified by Oracle on 2021.
+// Modifications copyright (c) 2021, Oracle and/or its affiliates.
+// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
+
 // Use, modification and distribution is subject to the Boost Software License,
 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
 // http://www.boost.org/LICENSE_1_0.txt)
@@ -27,10 +31,6 @@
 BOOST_GEOMETRY_REGISTER_C_ARRAY_CS(cs::cartesian)
 BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
 
-#ifdef BOOST_NO_CXX11_HDR_INITIALIZER_LIST
-#include <initializer_list>
-#endif//BOOST_NO_CXX11_HDR_INITIALIZER_LIST
-
 template <typename P>
 bg::model::polygon<P> create_polygon()
 {   
@@ -111,13 +111,11 @@ void test_all()
 template <typename P>
 void test_custom_polygon(bg::model::ring<P> IL)
 {   
-#ifdef BOOST_NO_CXX11_HDR_INITIALIZER_LIST
     std::initializer_list<bg::model::ring<P> > RIL = {IL};
     bg::model::polygon<P> pl1(RIL);
     std::ostringstream out;
     out << bg::dsv(pl1);
     BOOST_CHECK_EQUAL(out.str(), "(((3, 3), (3, 0), (0, 0), (0, 3), (3, 3)))");
-#endif//BOOST_NO_CXX11_HDR_INITIALIZER_LIST
 }
 
 template <typename P>
diff --git a/test/util/algorithm.cpp b/test/util/algorithm.cpp
index 0aef4ce37..dd3f35430 100644
--- a/test/util/algorithm.cpp
+++ b/test/util/algorithm.cpp
@@ -19,7 +19,7 @@
 #include <boost/geometry/util/algorithm.hpp>
 
 
-void test_dimension(bg::util::index_constant<0> index)
+void test_dimension(bg::util::index_constant<0>)
 {
     bool called = false;
     bg::detail::for_each_index<0>([&](auto index) { called = true; });