#lockdown Nick.Penwarden
#rb none
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MAJOR FEATURES + CHANGES
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Change 3209340 on 2016/11/23 by Ben.Marsh
Convert UE4 codebase to an "include what you use" model - where every header just includes the dependencies it needs, rather than every source file including large monolithic headers like Engine.h and UnrealEd.h.
Measured full rebuild times around 2x faster using XGE on Windows, and improvements of 25% or more for incremental builds and full rebuilds on most other platforms.
* Every header now includes everything it needs to compile.
* There's a CoreMinimal.h header that gets you a set of ubiquitous types from Core (eg. FString, FName, TArray, FVector, etc...). Most headers now include this first.
* There's a CoreTypes.h header that sets up primitive UE4 types and build macros (int32, PLATFORM_WIN64, etc...). All headers in Core include this first, as does CoreMinimal.h.
* Every .cpp file includes its matching .h file first.
* This helps validate that each header is including everything it needs to compile.
* No engine code includes a monolithic header such as Engine.h or UnrealEd.h any more.
* You will get a warning if you try to include one of these from the engine. They still exist for compatibility with game projects and do not produce warnings when included there.
* There have only been minor changes to our internal games down to accommodate these changes. The intent is for this to be as seamless as possible.
* No engine code explicitly includes a precompiled header any more.
* We still use PCHs, but they're force-included on the compiler command line by UnrealBuildTool instead. This lets us tune what they contain without breaking any existing include dependencies.
* PCHs are generated by a tool to get a statistical amount of coverage for the source files using it, and I've seeded the new shared PCHs to contain any header included by > 15% of source files.
Tool used to generate this transform is at Engine\Source\Programs\IncludeTool.
[CL 3209342 by Ben Marsh in Main branch]
- Fixes to the Mac HTML5 Device selection. .app files now work correctly.
- Re-enabled HTML5 in Mac Editor.
- Added HTML5LaunchHelper executable to clean up the process of LaunchOn for HTML5.
- Improve HTML5 SDK Settings Editor interface. Only the emscripten install directory is needed now, SDK version are automatically picked up and selected for use.
- Change UnrealPak to also account for bytes saved (>64KB) and percentage size of original file (<90%) when choosing to automatically turn off compression.
- Added Server Port option for HTML5 deploy to stop clashes on port 8000
- Adding more logging for use during debugging & tracing.
- Added an option to turn on HTML5 tracing api and added calls to the api.
- Fix up check() macros to throw alert messages and be more clear that something has gone wrong on HTML5.
#codereview Ankit.Khare
[CL 2452979 by James Moran in Main branch]
Android SDK path backslash duplication fix.
Fix for User inis not saving array properties correctly.
#codereview Ankit.Khare, Josh.Adams
[CL 2418611 by James Moran in Main branch]
