Unreal Engine Issues

Building UE4 solution fails in Test configuration

Attempting to build the full UE4 solution for the Test configuration fails in 4.21. Most projects will build successfully, but a few will fail with various errors. Most of the errors appear to be re ...

The "alignas" keyword cannot be used with a USTRUCT

The alignas keyword is not usable with a USTRUCT. It can be used with a normal struct. ...

FGenericPlatformMemory::OnOutOfMemory should be broadcasting GetOutOfMemoryDelegate instead of GetMemoryTrimDelegate

Windows FMallocTBB seems to have a memory leak

The InsertFeaturePacksIntoINIFile() function creates an invalid entry in the DefaultGame.ini file

The GameProjectUtils::InsertFeaturePacksIntoINIFile() function is not creating a valid entry in the DefaultGame.ini file. It is currently missing a double-quote at the end of the PackSource value fo ...

Project fails to build when the SQLite Amalgamation files are included in the project.

In 4.20, it is no longer possible to add the SQLite Almagamation files to a project. Attempting to build a project with these files added results in the build failing due to numerous errors about pr ...

FTransform(ENoInit) ensures in Debug on mobile platforms

As of 4.20, ENABLE_NAN_DIAGNOSTIC is now enabled in all Debug configurations. However, this does not work well with the TransformNonVectorized that is used on platforms like android. If this combina ...

InstallVisualizers.bat does not install debug Visualizers for Visual Studio 2017

The InstallVisualizers.bat file for 4.20 does not include a way to install the Visualizers for Visual Studio 2017. With Visual Studio 2017 now the default Windows IDE for the Engine, it may be helpf ...

Actors in TMap Blueprint Properties are not copied properly for PIE

Actors that reside in TMap blueprint variables refer to the Editor actors not the copied UEDPIE actors (that we'd expect) when accessed in PIE. This is not the case in standalone; this only occurs f ...

Project cannot build in VS 2017 15.8+ if it uses std::make_shared with an over-aligned type

Visual Studio 2017 15.8 includes a fix to properly handle std::make_shared used with over-aligned types. However, this is a breaking fix and requires the definition of one of two macros to either ac ...