ue-module-build-system

Unresolved external symbol errors occur when a module's Build.cs file lacks required dependency declarations. Identify the missing module dependency, add it to PublicDependencyModuleNames or PrivateDependencyModuleNames, and regenerate project files to resolve the link error.

Public dependencies in Build.cs expose their include paths to modules depending on your module, while private dependencies restrict includes to internal use only. Use public declarations for interface dependencies and private for implementation-only requirements.

Creating a new Unreal Engine module requires adding a Build.cs file, implementing the IModuleInterface class in a header, and registering the module name in the target .cs file. This establishes the module lifecycle and makes it loadable by the engine.

Missing include file errors during Unreal Engine builds happen when the header belongs to a module not listed in your Build.cs dependencies. Add the required module name to the dependency array in Build.cs and ensure IWYU compliance to locate the include path.

Configuring module dependencies requires understanding Unreal Engine build tools, the Build.cs file structure, and module architecture. Familiarity with these systems is necessary to properly manage public vs private dependencies and avoid build errors.

Troubleshooting IWYU violations involves checking your Build.cs file for correct dependency and include path configurations, ensuring directly referenced headers are explicitly included, and consulting build system references to resolve missing module declarations.