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__) && !defined(__INTEL_COMPILER) && (((__GNUC__ * 100) + __GNUC_MINOR__) >= 800)
+#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);
     }
@@ -759,7 +764,12 @@
   totalDataOffset += size;
 
   auto target = reinterpret_cast<DUChainBaseData*>(m_data.back().array.data() + pos);
+#if defined(__GNUC__) && !defined(__INTEL_COMPILER) && (((__GNUC__ * 100) + __GNUC_MINOR__) >= 800)
+#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
@@ -569,7 +569,12 @@
         disableDUChainReferenceCounting(m_data);
 
 #ifndef QT_NO_DEBUG
+#if defined(__GNUC__) && !defined(__INTEL_COMPILER) && (((__GNUC__ * 100) + __GNUC_MINOR__) >= 800)
+#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__) && !defined(__INTEL_COMPILER) && (((__GNUC__ * 100) + __GNUC_MINOR__) >= 800)
+#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/CMakeLists.txt b/plugins/qmljs/3rdparty/qtcreator-libs/CMakeLists.txt
--- a/plugins/qmljs/3rdparty/qtcreator-libs/CMakeLists.txt
+++ b/plugins/qmljs/3rdparty/qtcreator-libs/CMakeLists.txt
@@ -51,6 +51,11 @@
     target_link_libraries(kdevqtc-qmlsupport LINK_PRIVATE "-framework Foundation" )
 endif()
 
+if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+   if (NOT CMAKE_CXX_COMPILER_VERSION VERSION_LESS "8.0.0")
+      target_compile_options(kdevqtc-qmlsupport PRIVATE "-Wno-class-memaccess")
+   endif()
+endif()
 if (CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     target_compile_options(kdevqtc-qmlsupport PRIVATE "-Wno-documentation")
 endif()