Fixes various compiler diagnostics

Found with LLVM 3.9.1 and then fixed the most severe categories.

src/contractor/contractor.cpp

@@ -906,7 +906,7 @@ EdgeID Contractor::LoadEdgeExpandedGraph(
                 auto speed_iter =
                     find(segment_speed_lookup,
                          SegmentSpeedSource{
-                             previous_osm_node_id, segmentblocks[i].this_osm_node_id, {0, 0}});
+                             {previous_osm_node_id, segmentblocks[i].this_osm_node_id}, {0, 0}});
                 if (speed_iter != segment_speed_lookup.end())
                 {
                     if (speed_iter->speed_source.speed > 0)
@@ -947,10 +947,10 @@ EdgeID Contractor::LoadEdgeExpandedGraph(
                 continue;
             }
 
-            auto turn_iter =
-                find(turn_penalty_lookup,
-                     TurnPenaltySource{
-                         penaltyblock->from_id, penaltyblock->via_id, penaltyblock->to_id, {0, 0}});
+            auto turn_iter = find(
+                turn_penalty_lookup,
+                TurnPenaltySource{
+                    {penaltyblock->from_id, penaltyblock->via_id, penaltyblock->to_id}, {0, 0}});
             if (turn_iter != turn_penalty_lookup.end())
             {
                 int new_turn_weight = static_cast<int>(turn_iter->penalty_source.penalty * 10);

src/engine/guidance/assemble_overview.cpp

@@ -1,6 +1,3 @@
-#ifndef ENGINE_GUIDANCE_ASSEMBLE_OVERVIEW_HPP
-#define ENGINE_GUIDANCE_ASSEMBLE_OVERVIEW_HPP
-
 #include "engine/douglas_peucker.hpp"
 #include "engine/guidance/leg_geometry.hpp"
 #include "util/viewport.hpp"
@@ -30,7 +27,7 @@ unsigned calculateOverviewZoomLevel(const std::vector<LegGeometry> &leg_geometri
 
     for (const auto &leg_geometry : leg_geometries)
     {
-        for (const auto coord : leg_geometry.locations)
+        for (const auto &coord : leg_geometry.locations)
         {
             south_west.lon = std::min(south_west.lon, coord.lon);
             south_west.lat = std::min(south_west.lat, coord.lat);
@@ -96,5 +93,3 @@ std::vector<util::Coordinate> assembleOverview(const std::vector<LegGeometry> &l
 } // namespace guidance
 } // namespace engine
 } // namespace osrm
-
-#endif

src/extractor/guidance/turn_classification.cpp

@@ -32,7 +32,7 @@ classifyIntersection(Intersection intersection)
 
         DiscreteBearing last_discrete_bearing = util::guidance::BearingClass::getDiscreteBearing(
             std::round(intersection.back().bearing));
-        for (const auto road : intersection)
+        for (const auto &road : intersection)
         {
             const DiscreteBearing discrete_bearing =
                 util::guidance::BearingClass::getDiscreteBearing(std::round(road.bearing));

src/extractor/guidance/turn_lane_data.cpp

@@ -106,7 +106,7 @@ LaneDataVector laneDataFromDescription(TurnLaneDescription turn_lane_description
     // transform the map into the lane data vector
     LaneDataVector lane_data;
     lane_data.reserve(lane_map.size());
-    for (const auto tag : lane_map)
+    for (const auto &tag : lane_map)
         lane_data.push_back({tag.first, tag.second.first, tag.second.second, false});
 
     std::sort(lane_data.begin(), lane_data.end());

src/server/api/parameters_parser.cpp

@@ -55,7 +55,7 @@ boost::optional<ParameterT> parseParameters(std::string::iterator &iter,
         // iterator to the failing position. Extract the position from the exception ourselves.
         iter = failure.first;
     }
-    catch (const boost::numeric::bad_numeric_cast &e)
+    catch (const boost::numeric::bad_numeric_cast &)
     {
         // this can happen if we get bad numeric values in the request, just handle
         // as normal parser error

src/storage/storage.cpp

@@ -102,7 +102,7 @@ Storage::ReturnCode Storage::Run(int max_wait)
         }
     }
     // hard unlock in case of any exception.
-    catch (boost::interprocess::lock_exception &ex)
+    catch (boost::interprocess::lock_exception &)
     {
         barriers.current_region_mutex.unlock_upgradable();
         // make sure we exit here because this is bad

src/util/assert.cpp

@@ -6,7 +6,7 @@
 namespace
 {
 // We hard-abort on assertion violations.
-void assertion_failed_msg_helper(
+[[noreturn]] void assertion_failed_msg_helper(
     char const *expr, char const *msg, char const *function, char const *file, long line)
 {
     std::cerr << "[assert] " << file << ":" << line << "\nin: " << function << ": " << expr << "\n"