diff --git a/CMakeLists.txt b/CMakeLists.txt
index a4f711528..8a56f2250 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -302,8 +302,12 @@ ELSEIF( MINGW )
     SET(CMAKE_CXX_FLAGS "-std=gnu++11 ${CMAKE_CXX_FLAGS}")
     SET(CMAKE_C_FLAGS "-fPIC ${CMAKE_C_FLAGS}")
   ENDIF()
-  SET(CMAKE_CXX_FLAGS "-fvisibility=hidden -fno-strict-aliasing -Wall -Wno-long-long -Wa,-mbig-obj -O3 ${CMAKE_CXX_FLAGS}")
-  SET(CMAKE_C_FLAGS "-fno-strict-aliasing ${CMAKE_C_FLAGS}")
+    IF (CMAKE_BUILD_TYPE STREQUAL "Debug")
+      SET(CMAKE_CXX_FLAGS "-fvisibility=hidden -fno-strict-aliasing -Wall -Wno-long-long -Wa,-mbig-obj -g ${CMAKE_CXX_FLAGS}")
+    ELSE()
+      SET(CMAKE_CXX_FLAGS "-fvisibility=hidden -fno-strict-aliasing -Wall -Wno-long-long -Wa,-mbig-obj -O3 ${CMAKE_CXX_FLAGS}")
+    ENDIF()
+    SET(CMAKE_C_FLAGS "-fno-strict-aliasing ${CMAKE_C_FLAGS}")
 ENDIF()
 
 IF ( IOS AND NOT ASSIMP_HUNTER_ENABLED)
diff --git a/code/AssetLib/3DS/3DSConverter.cpp b/code/AssetLib/3DS/3DSConverter.cpp
index 5a01429e4..2421d5460 100644
--- a/code/AssetLib/3DS/3DSConverter.cpp
+++ b/code/AssetLib/3DS/3DSConverter.cpp
@@ -262,7 +262,7 @@ void Discreet3DSImporter::ConvertMaterial(D3DS::Material &oldMat,
         unsigned int iWire = 1;
         mat.AddProperty<int>((int *)&iWire, 1, AI_MATKEY_ENABLE_WIREFRAME);
     }
-
+// fallthrough
     case D3DS::Discreet3DS::Gouraud:
         eShading = aiShadingMode_Gouraud;
         break;
diff --git a/code/AssetLib/3DS/3DSLoader.cpp b/code/AssetLib/3DS/3DSLoader.cpp
index 0ec8b872a..b76640218 100644
--- a/code/AssetLib/3DS/3DSLoader.cpp
+++ b/code/AssetLib/3DS/3DSLoader.cpp
@@ -1284,7 +1284,7 @@ void Discreet3DSImporter::ParseColorChunk(aiColor3D *out, bool acceptPercent) {
     switch (chunk.Flag) {
     case Discreet3DS::CHUNK_LINRGBF:
         bGamma = true;
-
+    // fallthrough
     case Discreet3DS::CHUNK_RGBF:
         if (sizeof(float) * 3 > diff) {
             *out = clrError;
@@ -1297,6 +1297,7 @@ void Discreet3DSImporter::ParseColorChunk(aiColor3D *out, bool acceptPercent) {
 
     case Discreet3DS::CHUNK_LINRGBB:
         bGamma = true;
+            // fallthrough
     case Discreet3DS::CHUNK_RGBB: {
         if (sizeof(char) * 3 > diff) {
             *out = clrError;
diff --git a/code/AssetLib/ASE/ASELoader.cpp b/code/AssetLib/ASE/ASELoader.cpp
index caa708961..7caac24ce 100644
--- a/code/AssetLib/ASE/ASELoader.cpp
+++ b/code/AssetLib/ASE/ASELoader.cpp
@@ -870,6 +870,7 @@ void ASEImporter::ConvertMaterial(ASE::Material &mat) {
         unsigned int iWire = 1;
         mat.pcInstance->AddProperty<int>((int *)&iWire, 1, AI_MATKEY_ENABLE_WIREFRAME);
     }
+    // fallthrough
     case D3DS::Discreet3DS::Gouraud:
         eShading = aiShadingMode_Gouraud;
         break;
diff --git a/code/AssetLib/Blender/BlenderDNA.cpp b/code/AssetLib/Blender/BlenderDNA.cpp
index 2910904ba..fbb61ab4f 100644
--- a/code/AssetLib/Blender/BlenderDNA.cpp
+++ b/code/AssetLib/Blender/BlenderDNA.cpp
@@ -325,10 +325,10 @@ void SectionParser ::Next() {
     stream.SetCurrentPos(current.start + current.size);
 
     const char tmp[] = {
-        (const char)stream.GetI1(),
-        (const char)stream.GetI1(),
-        (const char)stream.GetI1(),
-        (const char)stream.GetI1()
+        (char)stream.GetI1(),
+        (char)stream.GetI1(),
+        (char)stream.GetI1(),
+        (char)stream.GetI1()
     };
     current.id = std::string(tmp, tmp[3] ? 4 : tmp[2] ? 3 : tmp[1] ? 2 : 1);
 
diff --git a/code/AssetLib/Blender/BlenderLoader.cpp b/code/AssetLib/Blender/BlenderLoader.cpp
index 2ed0d6b8a..9322369eb 100644
--- a/code/AssetLib/Blender/BlenderLoader.cpp
+++ b/code/AssetLib/Blender/BlenderLoader.cpp
@@ -986,7 +986,7 @@ void BlenderImporter::ConvertMesh(const Scene & /*in*/, const Object * /*obj*/,
     // key is material number, value is the TextureUVMapping for the material
     typedef std::map<uint32_t, TextureUVMapping> MaterialTextureUVMappings;
     MaterialTextureUVMappings matTexUvMappings;
-    const uint32_t maxMat = static_cast<const uint32_t>(mesh->mat.size());
+    const uint32_t maxMat = static_cast<uint32_t>(mesh->mat.size());
     for (uint32_t m = 0; m < maxMat; ++m) {
         // get material by index
         const std::shared_ptr<Material> pMat = mesh->mat[m];
diff --git a/code/AssetLib/Collada/ColladaParser.cpp b/code/AssetLib/Collada/ColladaParser.cpp
index 9b3af0848..52e9b4978 100644
--- a/code/AssetLib/Collada/ColladaParser.cpp
+++ b/code/AssetLib/Collada/ColladaParser.cpp
@@ -1616,6 +1616,7 @@ void ColladaParser::ReadIndexData(XmlNode &node, Mesh &pMesh) {
                     XmlParser::getValueAsString(currentNode, v);
                     const char *content = v.c_str();
                     vcount.reserve(numPrimitives);
+                    SkipSpacesAndLineEnd(&content);
                     for (unsigned int a = 0; a < numPrimitives; a++) {
                         if (*content == 0) {
                             throw DeadlyImportError("Expected more values while reading <vcount> contents.");
diff --git a/code/AssetLib/LWO/LWOLoader.cpp b/code/AssetLib/LWO/LWOLoader.cpp
index 44517a1a6..77589d63c 100644
--- a/code/AssetLib/LWO/LWOLoader.cpp
+++ b/code/AssetLib/LWO/LWOLoader.cpp
@@ -1540,6 +1540,7 @@ void LWOImporter::LoadLWO2File() {
                     break;
                 }
                 // --- intentionally no break here
+                // fallthrough
             case AI_LWO_VMAP: {
                 if (skip)
                     break;
diff --git a/code/AssetLib/MMD/MMDPmxParser.h b/code/AssetLib/MMD/MMDPmxParser.h
index 08f57f6f0..c9df37c68 100644
--- a/code/AssetLib/MMD/MMDPmxParser.h
+++ b/code/AssetLib/MMD/MMDPmxParser.h
@@ -357,6 +357,8 @@ namespace pmx
 	{
 	public:
 		void virtual Read(std::istream *stream, PmxSetting *setting) = 0;
+
+        virtual ~PmxMorphOffset() = default;
 	};
 
 	class PmxMorphVertexOffset : public PmxMorphOffset
diff --git a/code/AssetLib/glTF/glTFAsset.inl b/code/AssetLib/glTF/glTFAsset.inl
index 1f4544156..86fba95b7 100644
--- a/code/AssetLib/glTF/glTFAsset.inl
+++ b/code/AssetLib/glTF/glTFAsset.inl
@@ -891,12 +891,12 @@ inline void Mesh::Decode_O3DGC(const SCompression_Open3DGC &pCompression_Open3DG
     auto get_buf_offset = [](Ref<Accessor> &pAccessor) -> size_t { return pAccessor->byteOffset + pAccessor->bufferView->byteOffset; };
 
     // Indices
-    ifs.SetCoordIndex((IndicesType *const)(decoded_data + get_buf_offset(primitives[0].indices)));
+    ifs.SetCoordIndex((IndicesType *)(decoded_data + get_buf_offset(primitives[0].indices)));
     // Coordinates
-    ifs.SetCoord((o3dgc::Real *const)(decoded_data + get_buf_offset(primitives[0].attributes.position[0])));
+    ifs.SetCoord((o3dgc::Real *)(decoded_data + get_buf_offset(primitives[0].attributes.position[0])));
     // Normals
     if (size_normal) {
-        ifs.SetNormal((o3dgc::Real *const)(decoded_data + get_buf_offset(primitives[0].attributes.normal[0])));
+        ifs.SetNormal((o3dgc::Real *)(decoded_data + get_buf_offset(primitives[0].attributes.normal[0])));
     }
 
     for (size_t idx = 0, idx_end = size_floatattr.size(), idx_texcoord = 0; idx < idx_end; idx++) {
@@ -904,7 +904,7 @@ inline void Mesh::Decode_O3DGC(const SCompression_Open3DGC &pCompression_Open3DG
         case o3dgc::O3DGC_IFS_FLOAT_ATTRIBUTE_TYPE_TEXCOORD:
             if (idx_texcoord < primitives[0].attributes.texcoord.size()) {
                 // See above about absent attributes.
-                ifs.SetFloatAttribute(static_cast<unsigned long>(idx), (o3dgc::Real *const)(decoded_data + get_buf_offset(primitives[0].attributes.texcoord[idx])));
+                ifs.SetFloatAttribute(static_cast<unsigned long>(idx), (o3dgc::Real *)(decoded_data + get_buf_offset(primitives[0].attributes.texcoord[idx])));
                 idx_texcoord++;
             }
 
diff --git a/code/AssetLib/glTF2/glTF2Asset.h b/code/AssetLib/glTF2/glTF2Asset.h
index c597fc951..44ab6c9c8 100644
--- a/code/AssetLib/glTF2/glTF2Asset.h
+++ b/code/AssetLib/glTF2/glTF2Asset.h
@@ -374,6 +374,8 @@ struct CustomExtension {
             mValues(other.mValues) {
         // empty
     }
+
+    CustomExtension& operator=(const CustomExtension&) = default;
 };
 
 //! Base class for all glTF top-level objects
diff --git a/contrib/clipper/clipper.cpp b/contrib/clipper/clipper.cpp
index 857cd1c3e..2d02aff67 100644
--- a/contrib/clipper/clipper.cpp
+++ b/contrib/clipper/clipper.cpp
@@ -86,6 +86,13 @@ class Int128
 
     Int128(const Int128 &val): hi(val.hi), lo(val.lo){}
 
+    Int128 operator = (const Int128 &val)
+    {
+        lo = val.lo;
+        hi = val.hi;
+        return val;
+    }
+
     long64 operator = (const long64 &val)
     {
       lo = val;