Making Clang-Tidy work with UE source code.
We have found:
.\Engine\Binaries\DotNET\UnrealBuildTool\UnrealBuildTool.exe -mode=GenerateClangDatabase UnrealGame Win64 Development
Which will generate a compile_command.json database that can be passed into Clang-tidy. However, these compile commands don't actually seem to usable for all C++ source files to actually compile the files. For example, compilation may halt with
error: 'HAL/IConsoleManager.h' file not found
We were able to make the compile_commands include header files by adding InputFiles.AddRange(InputFileCollection.HeaderFiles); to GenerateClangDatabase.cs and rebuilding UBT. However, even this larger compile_commands.json with the headers seems to not be enough for clang-tidy to proceed past the file not found errors.
clang-tidy -p ".\compile_commands.json" Engine\Plugins\Media\PixelStreaming\Source\PixelStreaming\Private\Streamer.cpp --
(this assumes a .clang-tidy file in the root of your project).