[algorithms][formulas][strategies] Fix unused variable warnings.

include/boost/geometry/algorithms/detail/envelope/segment.hpp

@@ -4,8 +4,8 @@
 // Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
 // Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
 
-// This file was modified by Oracle on 2015-2017.
-// Modifications copyright (c) 2015-2017, Oracle and/or its affiliates.
+// This file was modified by Oracle on 2015-2018.
+// Modifications copyright (c) 2015-2018, Oracle and/or its affiliates.
 
 // Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
 // Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
@@ -21,6 +21,7 @@
 #include <cstddef>
 #include <utility>
 
+#include <boost/core/ignore_unused.hpp>
 #include <boost/numeric/conversion/cast.hpp>
 
 #include <boost/geometry/core/assert.hpp>
@@ -163,6 +164,7 @@ private:
     {
         // coordinates are assumed to be in radians
         BOOST_GEOMETRY_ASSERT(lon1 <= lon2);
+        boost::ignore_unused(lon1, lon2);
 
         CalculationType lat1_rad = math::as_radian<Units>(lat1);
         CalculationType lat2_rad = math::as_radian<Units>(lat2);

include/boost/geometry/formulas/vertex_longitude.hpp

@@ -1,6 +1,6 @@
 // Boost.Geometry
 
-// Copyright (c) 2016-2017 Oracle and/or its affiliates.
+// Copyright (c) 2016-2018 Oracle and/or its affiliates.
 
 // Contributed and/or modified by Vissarion Fysikopoulos, on behalf of Oracle
 // Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
@@ -337,13 +337,13 @@ class vertex_longitude<CT, cartesian_tag>
 {
 public :
     template <typename Strategy>
-    static inline CT apply(CT& lon1,
-                           CT& lat1,
+    static inline CT apply(CT& /*lon1*/,
+                           CT& /*lat1*/,
                            CT& lon2,
-                           CT& lat2,
-                           CT const& vertex_lat,
-                           CT& alp1,
-                           Strategy const& azimuth_strategy)
+                           CT& /*lat2*/,
+                           CT const& /*vertex_lat*/,
+                           CT& /*alp1*/,
+                           Strategy const& /*azimuth_strategy*/)
     {
         return lon2;
     }

include/boost/geometry/strategies/spherical/intersection.hpp

@@ -541,7 +541,7 @@ private:
 
     template <typename Point1, typename Point2, typename Vec3d, typename Plane, typename CalcT>
     static inline bool calculate_collinear_data(Point1 const& a1, Point1 const& a2, // in
-                                                Point2 const& b1, Point2 const& b2, // in
+                                                Point2 const& b1, Point2 const& /*b2*/, // in
                                                 Vec3d const& a1v,                   // in
                                                 Vec3d const& a2v,                   // in
                                                 Plane const& plane1,                // in