diff --git a/generator/templates/dawn_wire/WireCmd.cpp b/generator/templates/dawn_wire/WireCmd.cpp
index 653d79b7c8..46a3d310ca 100644
--- a/generator/templates/dawn_wire/WireCmd.cpp
+++ b/generator/templates/dawn_wire/WireCmd.cpp
@@ -425,9 +425,16 @@ namespace dawn_wire {
     ObjectHandle::ObjectHandle(ObjectId id, ObjectGeneration generation)
         : id(id), generation(generation) {
     }
+
     ObjectHandle::ObjectHandle(const volatile ObjectHandle& rhs)
         : id(rhs.id), generation(rhs.generation) {
     }
+    ObjectHandle& ObjectHandle::operator=(const volatile ObjectHandle& rhs) {
+        id = rhs.id;
+        generation = rhs.generation;
+        return *this;
+    }
+
     ObjectHandle& ObjectHandle::AssignFrom(const ObjectHandle& rhs) {
         id = rhs.id;
         generation = rhs.generation;
diff --git a/generator/templates/dawn_wire/WireCmd.h b/generator/templates/dawn_wire/WireCmd.h
index b54f5de5ce..cdc146abc0 100644
--- a/generator/templates/dawn_wire/WireCmd.h
+++ b/generator/templates/dawn_wire/WireCmd.h
@@ -27,7 +27,9 @@ namespace dawn_wire {
 
       ObjectHandle();
       ObjectHandle(ObjectId id, ObjectGeneration generation);
+
       ObjectHandle(const volatile ObjectHandle& rhs);
+      ObjectHandle& operator=(const volatile ObjectHandle& rhs);
 
       // MSVC has a bug where it thinks the volatile copy assignment is a duplicate.
       // Workaround this by forwarding to a different function AssignFrom.
diff --git a/src/common/BUILD.gn b/src/common/BUILD.gn
index 61cadaa86f..cbf27c562d 100644
--- a/src/common/BUILD.gn
+++ b/src/common/BUILD.gn
@@ -90,16 +90,19 @@ config("dawn_internal") {
   # Enable more warnings that were found when using Dawn in other projects
   if (is_clang) {
     cflags = [
-      "-Wstrict-prototypes",
-      "-Winconsistent-missing-destructor-override",
-      "-Wshadow-field",
-      "-Wmissing-field-initializers",
-      "-Wcstring-format-directive",
-      "-Wtautological-unsigned-zero-compare",
-      "-Wreturn-std-move-in-c++11",
       "-Wconditional-uninitialized",
+      "-Wcstring-format-directive",
       "-Wc++11-narrowing",
+      "-Wdeprecated-copy",
       "-Wextra-semi-stmt",
+      "-Winconsistent-missing-destructor-override",
+      "-Winvalid-offsetof",
+      "-Wmissing-field-initializers",
+      "-Wpessimizing-move",
+      "-Wreturn-std-move-in-c++11",
+      "-Wshadow-field",
+      "-Wstrict-prototypes",
+      "-Wtautological-unsigned-zero-compare",
     ]
   }
 }
diff --git a/src/utils/WGPUHelpers.cpp b/src/utils/WGPUHelpers.cpp
index b2bf22347c..ef8d977676 100644
--- a/src/utils/WGPUHelpers.cpp
+++ b/src/utils/WGPUHelpers.cpp
@@ -176,6 +176,10 @@ namespace utils {
         }
     }
 
+    ComboRenderPassDescriptor::ComboRenderPassDescriptor(const ComboRenderPassDescriptor& other) {
+        *this = other;
+    }
+
     const ComboRenderPassDescriptor& ComboRenderPassDescriptor::operator=(
         const ComboRenderPassDescriptor& otherRenderPass) {
         cDepthStencilAttachmentInfo = otherRenderPass.cDepthStencilAttachmentInfo;
diff --git a/src/utils/WGPUHelpers.h b/src/utils/WGPUHelpers.h
index b8c48fb882..ccebc77f30 100644
--- a/src/utils/WGPUHelpers.h
+++ b/src/utils/WGPUHelpers.h
@@ -59,6 +59,8 @@ namespace utils {
       public:
         ComboRenderPassDescriptor(std::initializer_list<wgpu::TextureView> colorAttachmentInfo,
                                   wgpu::TextureView depthStencil = wgpu::TextureView());
+
+        ComboRenderPassDescriptor(const ComboRenderPassDescriptor& otherRenderPass);
         const ComboRenderPassDescriptor& operator=(
             const ComboRenderPassDescriptor& otherRenderPass);