Upgrade to clang-tidy 18

.clang-tidy

@@ -13,6 +13,11 @@ Checks: >
     -bugprone-forward-declaration-namespace,
     -bugprone-sizeof-expression,
     -bugprone-throw-keyword-missing,
+    -bugprone-chained-comparison,
+    -bugprone-incorrect-enable-if,
+    -bugprone-switch-missing-default-case,
+    -bugprone-empty-catch,
+    -bugprone-unused-return-value,
     -clang-analyzer-*,
     -clang-diagnostic-deprecated-declarations,
     -clang-diagnostic-constant-conversion,
@@ -49,11 +54,15 @@ Checks: >
     -misc-misplaced-const,
     -misc-definitions-in-headers,
     -misc-unused-parameters,
+    -misc-include-cleaner,
     modernize-concat-nested-namespaces,
     modernize-use-using,
     performance-*,
     -performance-noexcept-move-constructor,
+    -performance-noexcept-swap,
     -performance-no-int-to-ptr,
+    -performance-enum-size,
+    -performance-avoid-endl,
     readability-*,
     -readability-avoid-const-params-in-decls,
     -readability-braces-around-statements,
@@ -82,6 +91,10 @@ Checks: >
     -readability-make-member-function-const,
     -readability-redundant-string-init,
     -readability-non-const-parameter,
+    -readability-redundant-inline-specifier,
+    -readability-avoid-nested-conditional-operator,
+    -readability-avoid-return-with-void-value,
+    -readability-redundant-casting,
     -readability-static-accessed-through-instance
     
 WarningsAsErrors: '*'

.github/workflows/osrm-backend.yml

@@ -192,14 +192,14 @@ jobs:
             CXXCOMPILER: clang++-15
             CUCUMBER_TIMEOUT: 60000
 
-          - name: clang-15-debug-clang-tidy
+          - name: clang-18-debug-clang-tidy
             continue-on-error: false
             node: 18
-            runs-on: ubuntu-22.04
+            runs-on: ubuntu-24.04
             BUILD_TOOLS: ON
             BUILD_TYPE: Debug
-            CCOMPILER: clang-15
-            CXXCOMPILER: clang++-15
+            CCOMPILER: clang-18
+            CXXCOMPILER: clang++-18
             CUCUMBER_TIMEOUT: 60000
             ENABLE_CLANG_TIDY: ON
 
@@ -703,7 +703,7 @@ jobs:
         run: |
           ccache -p
           ccache -s
-
+  
   ci-complete:
     runs-on: ubuntu-22.04
     needs: [build-test-publish, docker-image, windows-release-node, benchmarks]

CHANGELOG.md

@@ -8,6 +8,7 @@
       - ADDED: Add support for opposite approach request parameter. [#6842](https://github.com/Project-OSRM/osrm-backend/pull/6842)
       - ADDED: Add support for accessing edge flags in `process_segment` [#6658](https://github.com/Project-OSRM/osrm-backend/pull/6658)
     - Build:
+      - CHANGED: Upgrade clang-format to version 15. [#6919](https://github.com/Project-OSRM/osrm-backend/pull/6919)
       - CHANGED: Use Debian Bookworm as base Docker image [#6904](https://github.com/Project-OSRM/osrm-backend/pull/6904)
       - CHANGED: Upgrade CI actions to latest versions [#6893](https://github.com/Project-OSRM/osrm-backend/pull/6893)
       - CHANGED:  Remove outdated warnings #6894 [#6894](https://github.com/Project-OSRM/osrm-backend/pull/6894)

include/extractor/serialization.hpp

@@ -215,7 +215,6 @@ inline void read(storage::tar::FileReader &reader,
                  const std::string &name,
                  detail::NameTableImpl<Ownership> &name_table)
 {
-    std::string buffer;
     util::serialization::read(reader, name, name_table.indexed_data);
 }
 } // namespace osrm::extractor::serialization

include/storage/shared_memory.hpp

@@ -61,7 +61,7 @@ class SharedMemory
         {
             shm = boost::interprocess::xsi_shared_memory(boost::interprocess::open_only, key);
 
-            util::Log(logDEBUG) << "opening " << (int)shm.get_shmid() << " from id " << (int)id;
+            util::Log(logDEBUG) << "opening " << shm.get_shmid() << " from id " << (int)id;
 
             region = boost::interprocess::mapped_region(shm, boost::interprocess::read_only);
         }

third_party/sol2/include/sol/sol.hpp

@@ -19416,7 +19416,13 @@ namespace sol { namespace function_detail {
 		}
 
 		template <bool is_yielding, bool no_trampoline>
-		static int call(lua_State* L) noexcept(std::is_nothrow_copy_assignable_v<T>) {
+		static int call(lua_State* L) 
+#if SOL_IS_ON(SOL_COMPILER_CLANG)
+		// apparent regression in clang 18 - llvm/llvm-project#91362
+#else
+			noexcept(std::is_nothrow_copy_assignable_v<T>)
+#endif
+		{
 			int nr;
 			if constexpr (no_trampoline) {
 				nr = real_call(L);
@@ -19456,7 +19462,13 @@ namespace sol { namespace function_detail {
 		}
 
 		template <bool is_yielding, bool no_trampoline>
-		static int call(lua_State* L) noexcept(std::is_nothrow_copy_assignable_v<T>) {
+		static int call(lua_State* L) 
+#if SOL_IS_ON(SOL_COMPILER_CLANG)
+		// apparent regression in clang 18 - llvm/llvm-project#91362
+#else
+			noexcept(std::is_nothrow_copy_assignable_v<T>)
+#endif
+		{
 			int nr;
 			if constexpr (no_trampoline) {
 				nr = real_call(L);

unit_tests/library/route.cpp

@@ -239,7 +239,6 @@ void test_route_same_coordinates(bool use_json_only_api)
                 BOOST_CHECK(((void)name, true));
 
                 // nothing can be said about mode, contains mode of transportation
-                const auto mode = std::get<json::String>(step_object.values.at("mode")).value;
                 BOOST_CHECK(!name.empty());
 
                 const auto &maneuver =

unit_tests/partitioner/bisection_graph_view.cpp

@@ -16,12 +16,15 @@ using namespace osrm::util;
 
 BOOST_AUTO_TEST_SUITE(graph_view)
 
-static void shuffle(std::vector<EdgeWithSomeAdditionalData> &grid_edges)
+namespace
+{
+void shuffle(std::vector<EdgeWithSomeAdditionalData> &grid_edges)
 {
     std::random_device rd;
     std::mt19937 rng(rd());
     std::shuffle(grid_edges.begin(), grid_edges.end(), rng);
 }
+} // namespace
 
 BOOST_AUTO_TEST_CASE(separate_top_bottom)
 {

unit_tests/util/static_rtree.cpp

@@ -235,8 +235,6 @@ auto make_rtree(const boost::filesystem::path &path, FixtureT &fixture)
 template <typename RTreeT = TestStaticRTree, typename FixtureT>
 void construction_test(const std::string &path, FixtureT &fixture)
 {
-    std::string leaves_path;
-    std::string nodes_path;
     auto rtree = make_rtree<RTreeT>(path, fixture);
     LinearSearchNN<TestData> lsnn(fixture.coords, fixture.edges);