diff --git a/kdevplatform/language/duchain/topducontextdynamicdata.cpp b/kdevplatform/language/duchain/topducontextdynamicdata.cpp
--- a/kdevplatform/language/duchain/topducontextdynamicdata.cpp
+++ b/kdevplatform/language/duchain/topducontextdynamicdata.cpp
@@ -87,7 +87,12 @@
     disableDUChainReferenceCounting(data.back().array.data());
   }else{
     //Just copy the data into another place, expensive copy constructors are not needed
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
     memcpy(&target, item.d_func(), size);
+#pragma GCC diagnostic pop
+#endif
     if (!isSharedDataItem) {
       item.setData(&target, false);
     }
@@ -757,7 +762,12 @@
   totalDataOffset += size;
 
   auto target = reinterpret_cast<DUChainBaseData*>(m_data.back().array.data() + pos);
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
   memcpy(target, data, size);
+#pragma GCC diagnostic pop
+#endif
 
   verifyDataInfo(ret, m_data);
   return ret;
diff --git a/kdevplatform/serialization/itemrepository.h b/kdevplatform/serialization/itemrepository.h
--- a/kdevplatform/serialization/itemrepository.h
+++ b/kdevplatform/serialization/itemrepository.h
@@ -558,7 +558,12 @@
         disableDUChainReferenceCounting(m_data);
 
 #ifndef QT_NO_DEBUG
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
       memset(item, 0, size); //For debugging, so we notice the data is wrong
+#pragma GCC diagnostic pop
+#endif
 #endif
 
       if(m_monsterBucketExtent) {
diff --git a/kdevplatform/util/embeddedfreetree.h b/kdevplatform/util/embeddedfreetree.h
--- a/kdevplatform/util/embeddedfreetree.h
+++ b/kdevplatform/util/embeddedfreetree.h
@@ -684,6 +684,9 @@
                //bound cannot be pos, because pos is invalid
                Q_ASSERT(bound != pos);
 
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
                 //Shuffle around the item at the free pos, so reference counting in constructors/destructors is not screwed up
                 char backup[sizeof(Data)];
                 memcpy(backup, m_items+pos, sizeof(Data));
@@ -707,6 +710,8 @@
                     target = bound-1;
                }
                memcpy(m_items+target, backup, sizeof(Data));
+#pragma GCC diagnostic pop
+#endif
 
                ItemHandler::copyTo(data, m_items[target]);
                return true;
diff --git a/plugins/qmljs/3rdparty/qtcreator-libs/qmljs/parser/qmljsparser.cpp b/plugins/qmljs/3rdparty/qtcreator-libs/qmljs/parser/qmljsparser.cpp
--- a/plugins/qmljs/3rdparty/qtcreator-libs/qmljs/parser/qmljsparser.cpp
+++ b/plugins/qmljs/3rdparty/qtcreator-libs/qmljs/parser/qmljsparser.cpp
@@ -70,7 +70,12 @@
     sym_stack = reinterpret_cast<Value*> (realloc(sym_stack, stack_size * sizeof(Value)));
     state_stack = reinterpret_cast<int*> (realloc(state_stack, stack_size * sizeof(int)));
     location_stack = reinterpret_cast<AST::SourceLocation*> (realloc(location_stack, stack_size * sizeof(AST::SourceLocation)));
+#if defined(__GNUC__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wclass-memaccess"
     string_stack = reinterpret_cast<QStringRef*> (realloc(string_stack, stack_size * sizeof(QStringRef)));
+#pragma GCC diagnostic pop
+#endif
 }
 
 Parser::Parser(Engine *engine):