diff --git a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Algebraic_curve_kernel_2.h b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Algebraic_curve_kernel_2.h
index b02303fa6af..2674b63e66b 100644
--- a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Algebraic_curve_kernel_2.h
+++ b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Algebraic_curve_kernel_2.h
@@ -356,10 +356,10 @@ public:
                      const OuterFunctor& outer)
          : _inner(inner), _outer(outer) {}
 
-       Unary_compose(const Unary_compose& other)
-         : _inner(other._inner), _outer(other._outer) {}
+       Unary_compose(const Unary_compose& other) = default;
+       Unary_compose& operator=(const Unary_compose& other) = default;
 
-         Unary_compose() : _inner(::boost::none),_outer(::boost::none) {}
+       Unary_compose() : _inner(::boost::none),_outer(::boost::none) {}
 
        typedef typename InnerFunctor::argument_type argument_type;
        typedef typename OuterFunctor::result_type result_type;
diff --git a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes.h b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes.h
index f1f45aab56c..974e26d0a57 100644
--- a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes.h
+++ b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes.h
@@ -1147,8 +1147,8 @@ public:
   Bitstream_descartes() : Base(new Rep()) {}
 
   //! Copy constructor
-  Bitstream_descartes(const Self& other) : Base(static_cast<const Base&>(other))
-  {}
+  Bitstream_descartes(const Self& other) = default;
+  Bitstream_descartes& operator=(const Self& other) = default;
 
   /*!
    * \brief Constructor for a polynomial \c f
diff --git a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_E08_tree.h b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_E08_tree.h
index d78d50acfd0..50ae06acee9 100644
--- a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_E08_tree.h
+++ b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_E08_tree.h
@@ -436,6 +436,9 @@ public:
   friend class CGAL::internal::Bitstream_descartes_E08_tree<TRAITS>;
   friend class CGAL::internal::Bitstream_descartes_E08_tree_rep<TRAITS>;
 
+  Bitstream_descartes_E08_node(const Self&) = default;
+  Self& operator= (const Self&) = delete;
+
 private:
     // "node data" (set individually in subdivision)
     Integer lower_num_, upper_num_; // TODO use lower_num_, width_num_ instead
@@ -466,8 +469,6 @@ private:
         log_eps_          = n.log_eps_;
         log_C_eps_        = n.log_C_eps_;
     }
-
-    Self& operator= (const Self&) = delete;
 }; // struct Bitstream_descartes_E08_node
 
 
diff --git a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h
index 869b758cb12..9d1084414cd 100644
--- a/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h
+++ b/Algebraic_kernel_d/include/CGAL/Algebraic_kernel_d/Bitstream_descartes_rndl_tree.h
@@ -525,6 +525,9 @@ public:
     friend class internal::Bitstream_descartes_rndl_tree<TRAITS>;
     friend class internal::Bitstream_descartes_rndl_tree_rep<TRAITS>;
 
+    Bitstream_descartes_rndl_node(const Self&) = default;
+    Self& operator= (const Self&) = delete;
+
 private:
     // "node data" (set individually in subdivision)
     Integer lower_num_, upper_num_; // TODO use lower_num_, width_num_ instead
@@ -557,8 +560,6 @@ private:
         log_eps_       = n.log_eps_;
         log_C_eps_     = n.log_C_eps_;
     }
-
-    Self& operator= (const Self&)=delete;
 }; // struct Bitstream_descartes_rndl_node
 
 
diff --git a/Installation/CMakeLists.txt b/Installation/CMakeLists.txt
index 28ee5079fdb..aa09f590126 100644
--- a/Installation/CMakeLists.txt
+++ b/Installation/CMakeLists.txt
@@ -354,7 +354,7 @@ include(${CGAL_MODULES_DIR}/CGAL_Macros.cmake)
 include(${CGAL_MODULES_DIR}/CGAL_enable_end_of_configuration_hook.cmake)
 cgal_setup_module_path()
 
-if(RUNNING_CGAL_AUTO_TEST)
+if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
   message(STATUS "Operating system:")
   execute_process(
     COMMAND uname -a
@@ -392,7 +392,7 @@ if(MSVC)
   uniquely_add_flags(CGAL_CXX_FLAGS "/fp:except-")
   uniquely_add_flags(CGAL_CXX_FLAGS "/bigobj") # Use /bigobj by default
 
-  if(RUNNING_CGAL_AUTO_TEST)
+  if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
     set(CMAKE_CXX_WARNING_LEVEL
         2
         CACHE STRING "MSVC C++ compiler warning level" FORCE)
@@ -445,7 +445,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
 
   if(GCC_FOUND)
 
-    if(RUNNING_CGAL_AUTO_TEST)
+    if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
       uniquely_add_flags(CGAL_CXX_FLAGS "-Wall")
       # Remove -g from the relevant CMAKE_CXX_FLAGS. This will also
       # propagate to the rest of the tests, since we overwrite those
@@ -482,7 +482,7 @@ message("== Generate version files (DONE) ==\n")
 #
 #--------------------------------------------------------------------------------------------------
 
-if(CGAL_DEV_MODE OR RUNNING_CGAL_AUTO_TEST)
+if(CGAL_DEV_MODE OR RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
   message("== Set up flags ==")
 
   # Ugly hack to be compatible with current CGAL testsuite process (as of
@@ -1256,4 +1256,4 @@ if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
   if(Qt5_FOUND)
     message(STATUS "USING Qt5_VERSION = '${Qt5Core_VERSION_STRING}'")
   endif()#Qt5_FOUND
-endif()#RUNNING_CGAL_AUTO_TEST
+endif()#RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE
diff --git a/Installation/cmake/modules/CGAL_Common.cmake b/Installation/cmake/modules/CGAL_Common.cmake
index 92de4630099..ce99da6489e 100644
--- a/Installation/cmake/modules/CGAL_Common.cmake
+++ b/Installation/cmake/modules/CGAL_Common.cmake
@@ -4,7 +4,7 @@ option(CGAL_DEV_MODE
   "Activate the CGAL developers mode. See https://github.com/CGAL/cgal/wiki/CGAL_DEV_MODE"
   $ENV{CGAL_DEV_MODE})
 
-if(RUNNING_CGAL_AUTO_TEST)
+if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
 # Just to avoid a warning from CMake if that variable is set on the command line...
 endif()
 
diff --git a/Installation/cmake/modules/CGAL_SetupCGALDependencies.cmake b/Installation/cmake/modules/CGAL_SetupCGALDependencies.cmake
index 59e846b89d2..827b8e3d11b 100644
--- a/Installation/cmake/modules/CGAL_SetupCGALDependencies.cmake
+++ b/Installation/cmake/modules/CGAL_SetupCGALDependencies.cmake
@@ -147,7 +147,7 @@ function(CGAL_setup_CGAL_dependencies target)
       "-features=extensions;-library=stlport4;-D_GNU_SOURCE")
     target_link_libraries(${target} INTERFACE "-library=stlport4")
   elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
-    if ( RUNNING_CGAL_AUTO_TEST )
+    if ( RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE )
       target_compile_options(${target} INTERFACE "-Wall")
     endif()
     if(CMAKE_CXX_COMPILER_VERSION VERSION_GREATER 3)
diff --git a/Installation/cmake/modules/CGAL_SetupFlags.cmake b/Installation/cmake/modules/CGAL_SetupFlags.cmake
index 514ad5c58c8..3693e29724e 100644
--- a/Installation/cmake/modules/CGAL_SetupFlags.cmake
+++ b/Installation/cmake/modules/CGAL_SetupFlags.cmake
@@ -46,7 +46,7 @@ uniquely_add_flags( CMAKE_EXE_LINKER_FLAGS_DEBUG      ${CGAL_EXE_LINKER_FLAGS_DE
 
 # Set a default build type if none is given
 if ( NOT CMAKE_BUILD_TYPE )
-  if( RUNNING_CGAL_AUTO_TEST )
+  if( RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE )
     typed_cache_set ( STRING "Build type: Release, Debug, RelWithDebInfo or MinSizeRel" CMAKE_BUILD_TYPE Debug   )
   else ()
     typed_cache_set ( STRING "Build type: Release, Debug, RelWithDebInfo or MinSizeRel" CMAKE_BUILD_TYPE Release )
diff --git a/Installation/cmake/modules/CGAL_enable_end_of_configuration_hook.cmake b/Installation/cmake/modules/CGAL_enable_end_of_configuration_hook.cmake
index 5909d3fc525..9710c8dbd90 100644
--- a/Installation/cmake/modules/CGAL_enable_end_of_configuration_hook.cmake
+++ b/Installation/cmake/modules/CGAL_enable_end_of_configuration_hook.cmake
@@ -90,7 +90,7 @@ function(CGAL_run_at_the_end_of_configuration variable access value current_list
   if(DEFINED CMAKE_BUILD_TYPE AND ( NOT CMAKE_BUILD_TYPE OR CMAKE_BUILD_TYPE STREQUAL "Debug") )
     set(keyword WARNING)
     set(type warning)
-    if(RUNNING_CGAL_AUTO_TEST)
+    if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
       # No warning in the CMake test suite, but a status message
       set(keyword)
       set(type notice)
diff --git a/Installation/cmake/modules/UseCGAL.cmake b/Installation/cmake/modules/UseCGAL.cmake
index 4d44ca90219..43449b85e51 100644
--- a/Installation/cmake/modules/UseCGAL.cmake
+++ b/Installation/cmake/modules/UseCGAL.cmake
@@ -13,7 +13,7 @@ if(NOT USE_CGAL_FILE_INCLUDED)
   set(USE_CGAL_FILE_INCLUDED 1)
 
   include(${CMAKE_CURRENT_LIST_DIR}/CGAL_Common.cmake)
-  if( CGAL_DEV_MODE OR RUNNING_CGAL_AUTO_TEST )
+  if( CGAL_DEV_MODE OR RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE )
     include(${CMAKE_CURRENT_LIST_DIR}/CGAL_SetupFlags.cmake)
   else()
     include(${CMAKE_CURRENT_LIST_DIR}/CGAL_display_flags.cmake)
diff --git a/Installation/lib/cmake/CGAL/CGALConfig.cmake b/Installation/lib/cmake/CGAL/CGALConfig.cmake
index 6edefb1810f..6f72b2cc2e4 100644
--- a/Installation/lib/cmake/CGAL/CGALConfig.cmake
+++ b/Installation/lib/cmake/CGAL/CGALConfig.cmake
@@ -89,7 +89,7 @@ if (NOT CGAL_DATA_DIR)
           if (EXISTS "${CMAKE_SOURCE_DIR}/../../data")
               set(CGAL_DATA_DIR "${CMAKE_SOURCE_DIR}/../../data")
           else()
-            if(CGAL_TEST_SUITE)
+            if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
               message(WARNING "CGAL_DATA_DIR cannot be deduced, set the variable CGAL_DATA_DIR to set the default value of CGAL::data_file_path()")
             endif()
           endif()
@@ -195,7 +195,7 @@ cgal_setup_module_path()
 set(CGAL_USE_FILE ${CGAL_MODULES_DIR}/UseCGAL.cmake)
 include(${CGAL_MODULES_DIR}/CGAL_target_use_TBB.cmake)
 
-if( CGAL_DEV_MODE OR RUNNING_CGAL_AUTO_TEST )
+if( CGAL_DEV_MODE OR RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE )
   # Do not use -isystem for CGAL include paths
   set(CMAKE_NO_SYSTEM_FROM_IMPORTED TRUE)
 endif()
diff --git a/Minkowski_sum_2/include/CGAL/Minkowski_sum_2/AABB_segment_2_primitive.h b/Minkowski_sum_2/include/CGAL/Minkowski_sum_2/AABB_segment_2_primitive.h
index b4b057ef2d0..59b5f208021 100644
--- a/Minkowski_sum_2/include/CGAL/Minkowski_sum_2/AABB_segment_2_primitive.h
+++ b/Minkowski_sum_2/include/CGAL/Minkowski_sum_2/AABB_segment_2_primitive.h
@@ -35,10 +35,8 @@ public:
   {
   }
 
-  AABB_segment_2_primitive(const AABB_segment_2_primitive &primitive)
-  {
-    m_it = primitive.id();
-  }
+  AABB_segment_2_primitive(const AABB_segment_2_primitive& primitive) = default;
+  AABB_segment_2_primitive& operator=(const AABB_segment_2_primitive& primitive) = default;
 
   const Id &id() const
   {
diff --git a/Nef_3/include/CGAL/Nef_3/SNC_SM_explorer.h b/Nef_3/include/CGAL/Nef_3/SNC_SM_explorer.h
index 4a38ac41754..cef97636549 100644
--- a/Nef_3/include/CGAL/Nef_3/SNC_SM_explorer.h
+++ b/Nef_3/include/CGAL/Nef_3/SNC_SM_explorer.h
@@ -30,10 +30,8 @@ class SNC_SM_explorer : public SMCDEC {
 
  public:
   SNC_SM_explorer(const Base& E) : Base(E) {}
-  Self& operator=(const Self& E) {
-    Base::operator=(E);
-    return *this;
-  }
+  SNC_SM_explorer(const Self& E) = default;
+  Self& operator=(const Self& E) = default;
 };
 
 } //namespace CGAL
diff --git a/Number_types/include/CGAL/FPU.h b/Number_types/include/CGAL/FPU.h
index 429941be991..fcc66c9ad6b 100644
--- a/Number_types/include/CGAL/FPU.h
+++ b/Number_types/include/CGAL/FPU.h
@@ -500,6 +500,7 @@ void
 FPU_set_cw (FPU_CW_t cw)
 {
 #ifdef CGAL_ALWAYS_ROUND_TO_NEAREST
+  CGAL_USE(cw);
   CGAL_assertion(cw == CGAL_FE_TONEAREST);
 #else
   CGAL_IA_SETFPCW(cw);
@@ -511,6 +512,7 @@ FPU_CW_t
 FPU_get_and_set_cw (FPU_CW_t cw)
 {
 #ifdef CGAL_ALWAYS_ROUND_TO_NEAREST
+    CGAL_USE(cw);
     CGAL_assertion(cw == CGAL_FE_TONEAREST);
     return CGAL_FE_TONEAREST;
 #else
diff --git a/Partition_2/include/CGAL/Partition_2/Rotation_tree_2.h b/Partition_2/include/CGAL/Partition_2/Rotation_tree_2.h
index fa78978a4dd..8887bc4164b 100644
--- a/Partition_2/include/CGAL/Partition_2/Rotation_tree_2.h
+++ b/Partition_2/include/CGAL/Partition_2/Rotation_tree_2.h
@@ -47,7 +47,8 @@ public:
    typedef typename Traits::Point_2                Point_2;
 
    using internal::vector< Rotation_tree_node_2<Traits_> >::push_back;
-      using internal::vector< Rotation_tree_node_2<Traits_> >::back;
+   using internal::vector< Rotation_tree_node_2<Traits_> >::back;
+   using internal::vector< Rotation_tree_node_2<Traits_> >::erase;
 
    class Greater {
       typename Traits::Less_xy_2 less;
@@ -78,7 +79,7 @@ public:
       Greater greater (traits.less_xy_2_object());
       Equal equal;
       std::sort(this->begin(), this->end(), greater);
-      std::unique(this->begin(), this->end(),equal);
+      this->erase(std::unique(this->begin(), this->end(),equal), this->end());
 
       // front() is the point with the largest x coordinate
 
diff --git a/Polyhedron/demo/Polyhedron/Plugins/Three_examples/CMakeLists.txt b/Polyhedron/demo/Polyhedron/Plugins/Three_examples/CMakeLists.txt
index f6b0e9c045b..db5531c9454 100644
--- a/Polyhedron/demo/Polyhedron/Plugins/Three_examples/CMakeLists.txt
+++ b/Polyhedron/demo/Polyhedron/Plugins/Three_examples/CMakeLists.txt
@@ -17,7 +17,7 @@ find_package(
   COMPONENTS OpenGL Script Svg
   OPTIONAL_COMPONENTS ScriptTools WebSockets)
 
-if(RUNNING_CGAL_AUTO_TEST)
+if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
   if(Qt5_FOUND)
     include(${CGAL_USE_FILE})
   endif()
diff --git a/STL_Extension/include/CGAL/Handle.h b/STL_Extension/include/CGAL/Handle.h
index 4fa3a17286b..07fb7748e21 100644
--- a/STL_Extension/include/CGAL/Handle.h
+++ b/STL_Extension/include/CGAL/Handle.h
@@ -122,7 +122,7 @@ class Handle
     int
     refs()  const noexcept { return PTR->count.load(std::memory_order_relaxed); }
 
-    Id_type id() const noexcept { return PTR - static_cast<Rep*>(0); }
+    Id_type id() const noexcept { return std::distance(static_cast<Rep*>(0), PTR); }
 
     bool identical(const Handle& h) const noexcept { return PTR == h.PTR; }
 
diff --git a/STL_Extension/include/CGAL/iterator.h b/STL_Extension/include/CGAL/iterator.h
index e395ab3c76f..ea9a964c8a3 100644
--- a/STL_Extension/include/CGAL/iterator.h
+++ b/STL_Extension/include/CGAL/iterator.h
@@ -1283,6 +1283,8 @@ template < typename D, typename V = std::tuple<>, typename O = std::tuple<> >
 struct Derivator
 {
   typedef Derivator<D, V, O> Self;
+  Derivator() = default;
+  Derivator(const Self&) = default;
   Self& operator=(const Self&) = delete;
   template <class Tuple>
   void tuple_dispatch(const Tuple&)
@@ -1296,6 +1298,8 @@ struct Derivator<D, std::tuple<V1, V...>, std::tuple<O1, O...> >
   typedef Derivator<D, std::tuple<V1, V...>, std::tuple<O1, O...> > Self;
   typedef Derivator<D, std::tuple<V...>, std::tuple<O...> > Base;
 
+  Derivator() = default;
+  Derivator(const Self&) = default;
   Self& operator=(const Self&) = delete;
 
   using Base::operator=;
diff --git a/Set_movable_separability_2/test/Set_movable_separability_2/CMakeLists.txt b/Set_movable_separability_2/test/Set_movable_separability_2/CMakeLists.txt
index c59acf0e24a..782b87fd820 100644
--- a/Set_movable_separability_2/test/Set_movable_separability_2/CMakeLists.txt
+++ b/Set_movable_separability_2/test/Set_movable_separability_2/CMakeLists.txt
@@ -4,7 +4,7 @@
 cmake_minimum_required(VERSION 3.1...3.23)
 project(Set_movable_separability_2_Tests)
 
-if(RUNNING_CGAL_AUTO_TEST)
+if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
   # Just to avoid a warning from CMake when that variable is set on the command line...
 endif()
 if(CGAL_DIR)
diff --git a/Surface_mesher/examples/Surface_mesher/CMakeLists.txt b/Surface_mesher/examples/Surface_mesher/CMakeLists.txt
index aab8a082853..6f74259ab17 100644
--- a/Surface_mesher/examples/Surface_mesher/CMakeLists.txt
+++ b/Surface_mesher/examples/Surface_mesher/CMakeLists.txt
@@ -11,7 +11,7 @@ if(CGAL_ImageIO_FOUND)
   create_single_source_cgal_program("mesh_an_implicit_function.cpp")
 
 else()
-  if(RUNNING_CGAL_AUTO_TEST)
+  if(RUNNING_CGAL_AUTO_TEST OR CGAL_TEST_SUITE)
     # Just to avoid a warning from CMake if that variable is set on the command line...
   endif()
 
diff --git a/Three/doc/Three/Three.txt b/Three/doc/Three/Three.txt
index dc4baa546c4..82f85f40736 100644
--- a/Three/doc/Three/Three.txt
+++ b/Three/doc/Three/Three.txt
@@ -392,7 +392,7 @@ Notice that an external plugin will not be automatically loaded in the Polyhedro
 
 
 \section example Examples
-All the examples are de-activated in the cmake list outside of our testsuite. To tesr them, one must add `-DRUNNING_CGAL_AUTO_TEST=ON` to the cmake call.
+All the examples are de-activated in the cmake list outside of our testsuite. To test them, one must add `-DCGAL_TEST_SUITE=ON` to the cmake call.
 \subsection example1 Creating a Basic Plugin
 \cgalExample{Three_examples/Basic_plugin.cpp}