UnrealEngineUWP/Engine/Source/Programs/AutomationTool/Scripts/BuildPhysX.Automation.cs

// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.
using System;
using System.Collections.Generic;
using System.IO;
using System.Threading;
using System.Linq;
using System.Reflection;
using Microsoft.Win32;
using System.Diagnostics;
using System.Text.RegularExpressions;
using AutomationTool;
using UnrealBuildTool;

[Help("Builds PhysX/APEX libraries using CMake build system.")]
[Help("TargetLibs", "Specify a list of target libraries to build, separated by '+' characters (eg. -TargetLibs=PhysX+APEX). Default is PhysX+APEX.")]
[Help("TargetPlatforms", "Specify a list of target platforms to build, separated by '+' characters (eg. -TargetPlatforms=Win32+Win64). Architectures are specified with '-'. Default is Win32+Win64+PS4.")]
[Help("TargetConfigs", "Specify a list of configurations to build, separated by '+' characters (eg. -TargetConfigs=profile+debug). Default is profile+release+checked.")]
[Help("TargetWindowsCompilers", "Specify a list of target compilers to use when building for Windows, separated by '+' characters (eg. -TargetCompilers=VisualStudio2012+VisualStudio2015). Default is VisualStudio2013+VisualStudio2015.")]
[Help("SkipBuild", "Do not perform build step. If this argument is not supplied libraries will be built (in accordance with TargetLibs, TargetPlatforms and TargetWindowsCompilers).")]
[Help("SkipDeployLibs", "Do not perform library deployment to the engine. If this argument is not supplied libraries will be copied into the engine.")]
[Help("SkipDeploySource", "Do not perform source deployment to the engine. If this argument is not supplied source will be copied into the engine.")]
[Help("SkipCreateChangelist", "Do not create a P4 changelist for source or libs. If this argument is not supplied source and libs will be added to a Perforce changelist.")]
[Help("SkipSubmit", "Do not perform P4 submit of source or libs. If this argument is not supplied source and libs will be automatically submitted to Perforce. If SkipCreateChangelist is specified, this argument applies by default.")]
[RequireP4]
class BuildPhysX : BuildCommand
{
	const int InvalidChangeList = -1;

	// The libs we can optionally build
	private enum PhysXTargetLib
	{
		PhysX,
		APEX,		// Note: Building APEX deploys shared binaries and libs
        NvCloth
	}

	private struct TargetPlatformData
	{
		public UnrealTargetPlatform Platform;
		public string Architecture;

		public TargetPlatformData(UnrealTargetPlatform InPlatform)
		{
			Platform = InPlatform;
			// Linux never has an empty architecture. If we don't care then it's x86_64-unknown-linux-gnu
			Architecture = (Platform == UnrealTargetPlatform.Linux) ? "x86_64-unknown-linux-gnu" : "";
		}
		public TargetPlatformData(UnrealTargetPlatform InPlatform, string InArchitecture)
		{
			Platform = InPlatform;
			Architecture = InArchitecture;
		}

		public override string ToString()
		{
			return Architecture == "" ? Platform.ToString() : Platform.ToString() + "_" + Architecture;
		}
	}

	// Apex libs that do not have an APEX prefix in their name
	private static string[] APEXSpecialLibs = { "NvParameterized", "RenderDebug" };

	// We cache our own MSDev and MSBuild executables
	private static UnrealBuildTool.FileReference MsDev14Exe;
	private static UnrealBuildTool.FileReference MsBuildExe;

	// Cache directories under the PhysX/ directory
	private static UnrealBuildTool.DirectoryReference PhysXSourceRootDirectory = UnrealBuildTool.DirectoryReference.Combine(CommandUtils.RootDirectory, "Engine", "Source", "ThirdParty", "PhysX");
	private static UnrealBuildTool.DirectoryReference PhysX34SourceRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXSourceRootDirectory, "PhysX_3.4");
	private static UnrealBuildTool.DirectoryReference APEX14SourceRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXSourceRootDirectory, "APEX_1.4");
    private static UnrealBuildTool.DirectoryReference NvClothSourceRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXSourceRootDirectory, "NvCloth");
	private static UnrealBuildTool.DirectoryReference SharedSourceRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXSourceRootDirectory, "PxShared");
	private static UnrealBuildTool.DirectoryReference RootOutputBinaryDirectory = UnrealBuildTool.DirectoryReference.Combine(CommandUtils.RootDirectory, "Engine", "Binaries", "ThirdParty", "PhysX");
	private static UnrealBuildTool.DirectoryReference RootOutputLibDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXSourceRootDirectory, "Lib");

	//private static UnrealBuildTool.DirectoryReference PhysX34SourceLibRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysX34SourceRootDirectory, "Lib");
	//private static UnrealBuildTool.DirectoryReference APEX14SourceLibRootDirectory = UnrealBuildTool.DirectoryReference.Combine(APEX14SourceRootDirectory, "Lib");
	//private static UnrealBuildTool.DirectoryReference SharedSourceLibRootDirectory = UnrealBuildTool.DirectoryReference.Combine(SharedSourceRootDirectory, "Lib");


	//private static UnrealBuildTool.DirectoryReference PhysXEngineBinaryRootDirectory = UnrealBuildTool.DirectoryReference.Combine(UnrealBuildTool.UnrealBuildTool.RootDirectory, "Engine\\Binaries\\ThirdParty\\PhysX");
	//private static UnrealBuildTool.DirectoryReference PhysX34EngineBinaryRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXEngineBinaryRootDirectory, "PhysX-3.4");
	//private static UnrealBuildTool.DirectoryReference APEX14EngineBinaryRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXEngineBinaryRootDirectory, "APEX-1.4");
	//private static UnrealBuildTool.DirectoryReference SharedEngineBinaryRootDirectory = UnrealBuildTool.DirectoryReference.Combine(PhysXEngineBinaryRootDirectory, "PxShared-1.0");

	private static string GetCMakeNameAndSetupEnv(TargetPlatformData TargetData)
	{
		DirectoryReference CMakeRootDirectory = DirectoryReference.Combine(CommandUtils.RootDirectory, "Engine", "Extras", "ThirdPartyNotUE", "CMake");
		if(BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Linux)
		{
			return "cmake";
		}

		Environment.SetEnvironmentVariable("CMAKE_ROOT", DirectoryReference.Combine(CMakeRootDirectory, "share").ToString());
		Log("set {0}={1}", "CMAKE_ROOT", Environment.GetEnvironmentVariable("CMAKE_ROOT"));

		switch (TargetData.Platform)
		{
		case UnrealTargetPlatform.HTML5:
				return "cmake";
		case UnrealTargetPlatform.Mac:
		case UnrealTargetPlatform.IOS:
		case UnrealTargetPlatform.TVOS:
			return FileReference.Combine(CMakeRootDirectory, "bin", "cmake").ToString();
		default:
			return FileReference.Combine(CMakeRootDirectory, "bin", "cmake.exe").ToString();
		}
	}

	private static string GetCMakeTargetDirectoryName(TargetPlatformData TargetData, WindowsCompiler TargetWindowsCompiler)
	{
		string VisualStudioDirectoryName;
		switch (TargetWindowsCompiler)
		{
			case WindowsCompiler.VisualStudio2013:
				VisualStudioDirectoryName = "VS2013";
				break;
			case WindowsCompiler.VisualStudio2015:
				VisualStudioDirectoryName = "VS2015";
				break;
			default:
				throw new AutomationException(String.Format("Non-CMake or unsupported windows compiler '{0}' supplied to GetCMakeTargetDirectoryName", TargetWindowsCompiler));
		}

		switch (TargetData.Platform)
		{
			// Note slashes need to be '/' as this gets string-composed in the CMake script with other paths
			case UnrealTargetPlatform.Win32:
				return "Win32/" + VisualStudioDirectoryName;
			case UnrealTargetPlatform.Win64:
				return "Win64/" + VisualStudioDirectoryName;
			case UnrealTargetPlatform.Android:
				switch (TargetData.Architecture)
				{
					default:
					case "armv7": return "Android/ARMv7";
					case "arm64": return "Android/ARM64";
					case "x86": return "Android/x86";
					case "x64": return "Android/x64";
				}
			case UnrealTargetPlatform.HTML5:
			default:
				return TargetData.Platform.ToString();
		}
	}

	private static UnrealBuildTool.DirectoryReference GetProjectDirectory(PhysXTargetLib TargetLib, TargetPlatformData TargetData, WindowsCompiler TargetWindowsCompiler = WindowsCompiler.VisualStudio2015)
	{
		UnrealBuildTool.DirectoryReference Directory = new UnrealBuildTool.DirectoryReference(GetTargetLibRootDirectory(TargetLib).ToString());

		switch(TargetLib)
		{
			case PhysXTargetLib.PhysX:
				Directory = UnrealBuildTool.DirectoryReference.Combine(Directory, "Source");
				break;
			case PhysXTargetLib.APEX:
				// APEX has its 'compiler' directory in a different location off the root of APEX
				break;
		}

		return UnrealBuildTool.DirectoryReference.Combine(Directory, "compiler", GetCMakeTargetDirectoryName(TargetData, TargetWindowsCompiler));
	}

	private static string GetLinuxToolchainSettings(TargetPlatformData TargetData)
	{
		if (BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Linux)
		{
			// in native builds we don't really use a crosstoolchain description, just use system compiler
			return " -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++";
		}

		// otherwise, use a per-architecture file.
		return " -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\Linux\\LinuxCrossToolchain.multiarch.cmake\"" + " -DARCHITECTURE_TRIPLE=" + TargetData.Architecture;
	}

	private static string GetCMakeArguments(PhysXTargetLib TargetLib, TargetPlatformData TargetData, string BuildConfig = "", WindowsCompiler TargetWindowsCompiler = WindowsCompiler.VisualStudio2015)
	{
		string VisualStudioName;
		switch(TargetWindowsCompiler)
		{
			case WindowsCompiler.VisualStudio2013:
				VisualStudioName = "Visual Studio 12 2013";
				break;
			case WindowsCompiler.VisualStudio2015:
				VisualStudioName = "Visual Studio 14 2015";
				break;
			default:
				throw new AutomationException(String.Format("Non-CMake or unsupported platform '{0}' supplied to GetCMakeArguments", TargetData.ToString()));
		}

		string OutputFlags = " -DPX_OUTPUT_LIB_DIR=" + GetPlatformLibDirectory(TargetData, TargetWindowsCompiler);
		if(PlatformHasBinaries(TargetData))
		{
			OutputFlags += " -DPX_OUTPUT_DLL_DIR=" + GetPlatformBinaryDirectory(TargetData, TargetWindowsCompiler) + " -DPX_OUTPUT_EXE_DIR=" + GetPlatformBinaryDirectory(TargetData, TargetWindowsCompiler);
		}

		// Enable response files for platforms that require them.
		// Response files are used for include paths etc, to fix max command line length issues.
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.PS4:
			case UnrealTargetPlatform.Linux:
				OutputFlags += " -DUSE_RESPONSE_FILES=1";
				break;
		}

		string ApexFlags = " -DAPEX_ENABLE_UE4=1";
		switch (TargetLib)
		{
			case PhysXTargetLib.PhysX:
				DirectoryReference PhysXCMakeFiles = DirectoryReference.Combine(PhysX34SourceRootDirectory, "Source", "compiler", "cmake");
				switch (TargetData.Platform)
				{
					case UnrealTargetPlatform.Win32:
						return DirectoryReference.Combine(PhysXCMakeFiles, "Windows").ToString() + " -G \"" + VisualStudioName + "\" -AWin32 -DTARGET_BUILD_PLATFORM=Windows" + OutputFlags;
					case UnrealTargetPlatform.Win64:
						return DirectoryReference.Combine(PhysXCMakeFiles, "Windows").ToString() + " -G \"" + VisualStudioName + "\" -Ax64 -DTARGET_BUILD_PLATFORM=Windows" + OutputFlags;
					 case UnrealTargetPlatform.PS4:
						return DirectoryReference.Combine(PhysXCMakeFiles, "PS4").ToString() + " -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=PS4 -DCMAKE_BUILD_TYPE=" + BuildConfig + " -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\PS4\\PS4Toolchain.txt\"" + OutputFlags;
					case UnrealTargetPlatform.XboxOne:
						return DirectoryReference.Combine(PhysXCMakeFiles, "XboxOne").ToString() + " -G \"Visual Studio 14 2015\" -DTARGET_BUILD_PLATFORM=XboxOne -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\XboxOne\\XboxOneToolchain.txt\" -DCMAKE_GENERATOR_PLATFORM=DURANGO" + OutputFlags;
					case UnrealTargetPlatform.Android:
						string NDKDirectory = Environment.GetEnvironmentVariable("NDKROOT");

						// don't register if we don't have an NDKROOT specified
						if (String.IsNullOrEmpty(NDKDirectory))
						{
							throw new BuildException("NDKROOT is not specified; cannot build Android.");
						}

						NDKDirectory = NDKDirectory.Replace("\"", "");

						string AndroidAPILevel = "android-19";
						string AndroidABI = "armeabi-v7a";
						switch (TargetData.Architecture)
						{
							case "armv7": AndroidAPILevel = "android-19"; AndroidABI = "armeabi-v7a"; break;
							case "arm64": AndroidAPILevel = "android-21"; AndroidABI = "arm64-v8a"; break;
							case "x86":   AndroidAPILevel = "android-19"; AndroidABI = "x86"; break;
							case "x64":   AndroidAPILevel = "android-21"; AndroidABI = "x86_64"; break;
						}
						return DirectoryReference.Combine(PhysXCMakeFiles, "Android").ToString() + " -G \"MinGW Makefiles\" -DTARGET_BUILD_PLATFORM=Android -DCMAKE_BUILD_TYPE=" + BuildConfig + " -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\Android\\android.toolchain.cmake\" -DANDROID_NDK=\"" + NDKDirectory + "\" -DCMAKE_MAKE_PROGRAM=\"" + NDKDirectory + "\\prebuilt\\windows-x86_64\\bin\\make.exe\" -DANDROID_NATIVE_API_LEVEL=\"" + AndroidAPILevel + "\" -DANDROID_ABI=\"" + AndroidABI + "\" -DANDROID_STL=gnustl_shared" + OutputFlags;
					case UnrealTargetPlatform.Linux:
						return DirectoryReference.Combine(PhysXCMakeFiles, "Linux").ToString() + " --no-warn-unused-cli -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=Linux -DPX_STATIC_LIBRARIES=1 -DCMAKE_BUILD_TYPE=" + BuildConfig + GetLinuxToolchainSettings(TargetData) + OutputFlags;
					case UnrealTargetPlatform.Mac:
						return DirectoryReference.Combine(PhysXCMakeFiles, "Mac").ToString() + " -G \"Xcode\" -DTARGET_BUILD_PLATFORM=Mac" + OutputFlags;
					case UnrealTargetPlatform.IOS:
						return DirectoryReference.Combine(PhysXCMakeFiles, "IOS").ToString() + " -G \"Xcode\" -DTARGET_BUILD_PLATFORM=IOS" + OutputFlags;
					case UnrealTargetPlatform.TVOS:
						return DirectoryReference.Combine(PhysXCMakeFiles, "TVOS").ToString() + " -G \"Xcode\" -DTARGET_BUILD_PLATFORM=TVOS" + OutputFlags;
					case UnrealTargetPlatform.Switch:
						return DirectoryReference.Combine(PhysXCMakeFiles, "Switch").ToString() + " -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=Switch -DCMAKE_BUILD_TYPE=" + BuildConfig + " -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\Switch\\SwitchToolchain.cmake\"" + OutputFlags;
					case UnrealTargetPlatform.HTML5:
						string CmakeToolchainFile = FileReference.Combine(PhysXSourceRootDirectory, "Externals", "CMakeModules", "HTML5", "Emscripten." + BuildConfig + ".cmake").ToString();
						return DirectoryReference.Combine(PhysXCMakeFiles, "HTML5").ToString() +
							" -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=HTML5" +
							" -DPXSHARED_ROOT_DIR=\"" + SharedSourceRootDirectory.ToString() + "\"" +
							" -DNVSIMD_INCLUDE_DIR=\"" + SharedSourceRootDirectory.ToString() + "/src/NvSimd\"" +
							" -DNVTOOLSEXT_INCLUDE_DIRS=\"" + PhysX34SourceRootDirectory + "/externals/nvToolsExt/include\"" +
							" -DEMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES=ON " +
							" -DCMAKE_BUILD_TYPE=\"Release\" -DCMAKE_TOOLCHAIN_FILE=\"" + CmakeToolchainFile + "\"" +
							OutputFlags;
					default:
						throw new AutomationException(String.Format("Non-CMake or unsupported platform '{0}' supplied to GetCMakeArguments", TargetData.ToString()));
				}
			case PhysXTargetLib.APEX:
				DirectoryReference ApexCMakeFiles = DirectoryReference.Combine(APEX14SourceRootDirectory, "compiler", "cmake");
				switch (TargetData.Platform)
				{
					case UnrealTargetPlatform.Win32:
						return DirectoryReference.Combine(ApexCMakeFiles, "Windows").ToString() + " -G \"" + VisualStudioName + "\" -AWin32 -DTARGET_BUILD_PLATFORM=Windows" + OutputFlags + ApexFlags;
					case UnrealTargetPlatform.Win64:
						return DirectoryReference.Combine(ApexCMakeFiles, "Windows").ToString() + " -G \"" + VisualStudioName + "\" -Ax64 -DTARGET_BUILD_PLATFORM=Windows" + OutputFlags + ApexFlags;
					case UnrealTargetPlatform.PS4:
						return DirectoryReference.Combine(ApexCMakeFiles, "PS4").ToString() + " -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=PS4 -DCMAKE_BUILD_TYPE=" + BuildConfig + " -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\PS4\\PS4Toolchain.txt\"" + OutputFlags + ApexFlags;
					case UnrealTargetPlatform.XboxOne:
						return DirectoryReference.Combine(ApexCMakeFiles, "XboxOne").ToString() + " -G \"Visual Studio 14 2015\" -DTARGET_BUILD_PLATFORM=XboxOne -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\XboxOne\\XboxOneToolchain.txt\" -DCMAKE_GENERATOR_PLATFORM=DURANGO" + OutputFlags + ApexFlags;
					case UnrealTargetPlatform.Switch:
						return DirectoryReference.Combine(ApexCMakeFiles, "Switch").ToString() + " -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=Switch -DCMAKE_BUILD_TYPE=" + BuildConfig + " -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\Switch\\SwitchToolchain.cmake\"" + OutputFlags + ApexFlags;
					case UnrealTargetPlatform.Linux:
						return DirectoryReference.Combine(ApexCMakeFiles, "Linux").ToString() + " --no-warn-unused-cli -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=Linux -DPX_STATIC_LIBRARIES=1 -DCMAKE_BUILD_TYPE=" + BuildConfig + GetLinuxToolchainSettings(TargetData) + OutputFlags + ApexFlags;
					case UnrealTargetPlatform.Mac:
						return DirectoryReference.Combine(ApexCMakeFiles, "Mac").ToString() + " -G \"Xcode\" -DTARGET_BUILD_PLATFORM=Mac" + OutputFlags + ApexFlags;
					 default:
						throw new AutomationException(String.Format("Non-CMake or unsupported platform '{0}' supplied to GetCMakeArguments", TargetData.ToString()));
				}
            case PhysXTargetLib.NvCloth:
                DirectoryReference NvClothCMakeFiles = DirectoryReference.Combine(NvClothSourceRootDirectory, "compiler", "cmake");
                switch (TargetData.Platform)
                {
                    case UnrealTargetPlatform.Win32:
                        return DirectoryReference.Combine(NvClothCMakeFiles, "Windows").ToString() + " -G \"" + VisualStudioName + "\" -AWin32 -DTARGET_BUILD_PLATFORM=Windows" + OutputFlags;
                    case UnrealTargetPlatform.Win64:
                        return DirectoryReference.Combine(NvClothCMakeFiles, "Windows").ToString() + " -G \"" + VisualStudioName + "\" -Ax64 -DTARGET_BUILD_PLATFORM=Windows" + OutputFlags;
                    case UnrealTargetPlatform.PS4:
                        return DirectoryReference.Combine(NvClothCMakeFiles, "PS4").ToString() + " -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=PS4 -DCMAKE_BUILD_TYPE=" + BuildConfig + " -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\PS4\\PS4Toolchain.txt\"" + OutputFlags;
                    case UnrealTargetPlatform.XboxOne:
                        return DirectoryReference.Combine(NvClothCMakeFiles, "XboxOne").ToString() + " -G \"Visual Studio 14 2015\" -DTARGET_BUILD_PLATFORM=XboxOne -DCMAKE_TOOLCHAIN_FILE=\"" + PhysXSourceRootDirectory + "\\Externals\\CMakeModules\\XboxOne\\XboxOneToolchain.txt\" -DCMAKE_GENERATOR_PLATFORM=DURANGO" + OutputFlags;
                    case UnrealTargetPlatform.Linux:
                        return DirectoryReference.Combine(NvClothCMakeFiles, "Linux").ToString() + " --no-warn-unused-cli -G \"Unix Makefiles\" -DTARGET_BUILD_PLATFORM=Linux -DPX_STATIC_LIBRARIES=1 -DCMAKE_BUILD_TYPE=" + BuildConfig + GetLinuxToolchainSettings(TargetData) + OutputFlags;
                    case UnrealTargetPlatform.Mac:
                        return DirectoryReference.Combine(NvClothCMakeFiles, "Mac").ToString() + " -G \"Xcode\" -DTARGET_BUILD_PLATFORM=Mac" + OutputFlags;

                    default:
						throw new AutomationException(String.Format("Non-CMake or unsupported platform '{0}' supplied to GetCMakeArguments", TargetData.ToString()));
				}
			default:
				throw new AutomationException(String.Format("Non-CMake or unsupported lib '{0}' supplied to GetCMakeArguments", TargetLib));
		}
	}

	private static string GetMsDevExe(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
				return MsDev14Exe.ToString();
			case UnrealTargetPlatform.Win64:
				return MsDev14Exe.ToString();
			case UnrealTargetPlatform.XboxOne:
				return MsDev14Exe.ToString();
			default:
				throw new AutomationException(String.Format("Non-MSBuild or unsupported platform '{0}' supplied to GetMsDevExe", TargetData.ToString()));
		}
	}

	private static string GetMsBuildExe(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
			case UnrealTargetPlatform.XboxOne:
				return MsBuildExe.ToString();
			default:
				throw new AutomationException(String.Format("Non-MSBuild or unsupported platform '{0}' supplied to GetMsBuildExe", TargetData.ToString()));
		}
	}

	private static string GetTargetLibSolutionName(PhysXTargetLib TargetLib)
	{
		switch (TargetLib)
		{
			case PhysXTargetLib.PhysX:
				return "PhysX.sln";
			case PhysXTargetLib.APEX:
				return "APEX.sln";
            case PhysXTargetLib.NvCloth:
                return "NvCloth.sln";
			default:
				throw new AutomationException(String.Format("Unknown target lib '{0}' specified to GetTargetLibSolutionName", TargetLib));
		}
	}

	private static UnrealBuildTool.FileReference GetTargetLibSolutionFileName(PhysXTargetLib TargetLib, TargetPlatformData TargetData, WindowsCompiler TargetWindowsCompiler)
	{
		UnrealBuildTool.DirectoryReference Directory = GetProjectDirectory(TargetLib, TargetData, TargetWindowsCompiler);
		return UnrealBuildTool.FileReference.Combine(Directory, GetTargetLibSolutionName(TargetLib));
	}

	private static bool DoesPlatformUseMSBuild(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
			case UnrealTargetPlatform.XboxOne:
				return true;
			default:
				return false;
		}
	}

	private static bool DoesPlatformUseMakefiles(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Android:
			case UnrealTargetPlatform.Linux:
			case UnrealTargetPlatform.HTML5:
			case UnrealTargetPlatform.PS4:
			case UnrealTargetPlatform.Switch:
				return true;
			default:
				return false;
		}
	}

	private static bool DoesPlatformUseXcode(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Mac:
			case UnrealTargetPlatform.IOS:
			case UnrealTargetPlatform.TVOS:
				return true;
			default:
				return false;
		}
	}

	private static DirectoryReference GetTargetLibRootDirectory(PhysXTargetLib TargetLib)
	{
		switch (TargetLib)
		{
			case PhysXTargetLib.PhysX:
				return PhysX34SourceRootDirectory;
			case PhysXTargetLib.APEX:
				return APEX14SourceRootDirectory;
            case PhysXTargetLib.NvCloth:
                return NvClothSourceRootDirectory;
			default:
				throw new AutomationException(String.Format("Unknown target lib '{0}' specified to GetTargetLibRootDirectory", TargetLib));
		}
	}

	private List<TargetPlatformData> GetTargetPlatforms()
	{
		List<TargetPlatformData> TargetPlatforms = new List<TargetPlatformData>();

		// Remove any platforms that aren't enabled on the command line
		string TargetPlatformFilter = ParseParamValue("TargetPlatforms", "Win32+Win64+PS4");
		if (TargetPlatformFilter != null)
		{
			foreach (string TargetPlatformName in TargetPlatformFilter.Split(new char[] { '+' }, StringSplitOptions.RemoveEmptyEntries))
			{
				string[] TargetPlatformAndArch = TargetPlatformName.Split(new char[] { '-' }, StringSplitOptions.RemoveEmptyEntries);

				UnrealTargetPlatform TargetPlatform;
				if (!Enum.TryParse(TargetPlatformAndArch[0], out TargetPlatform))
				{
					throw new AutomationException(String.Format("Unknown target platform '{0}' specified on command line", TargetPlatformName));
				}
				else
				{
					if (TargetPlatformAndArch.Count() == 2)
					{
						TargetPlatforms.Add(new TargetPlatformData(TargetPlatform, TargetPlatformAndArch[1]));
					}
					else if (TargetPlatformAndArch.Count() > 2)
					{
						// Linux archs are OS triplets, so have multiple dashes
						string DashedArch = TargetPlatformAndArch[1];
						for(int Idx = 2; Idx < TargetPlatformAndArch.Count(); ++Idx)
						{
							DashedArch += "-" + TargetPlatformAndArch[Idx];
						}
						TargetPlatforms.Add(new TargetPlatformData(TargetPlatform, DashedArch));
					}
					else
					{
						TargetPlatforms.Add(new TargetPlatformData(TargetPlatform));
					}
				}
			}
		}

		return TargetPlatforms;
	}

	public List<string> GetTargetConfigurations()
	{
		List<string> TargetConfigs = new List<string>();
		// Remove any configs that aren't enabled on the command line
		string TargetConfigFilter = ParseParamValue("TargetConfigs", "profile+release+checked");
		if (TargetConfigFilter != null)
		{
			foreach(string TargetConfig in TargetConfigFilter.Split(new char[] { '+' }, StringSplitOptions.RemoveEmptyEntries))
			{
				TargetConfigs.Add(TargetConfig);
			}
		}

		return TargetConfigs;
	}

	private List<PhysXTargetLib> GetTargetLibs()
	{
		List<PhysXTargetLib> TargetLibs = new List<PhysXTargetLib>();
		string TargetLibsFilter = ParseParamValue("TargetLibs", "PhysX+APEX+NvCloth");
		if (TargetLibsFilter != null)
		{
			foreach (string TargetLibName in TargetLibsFilter.Split(new char[] { '+' }, StringSplitOptions.RemoveEmptyEntries))
			{
				PhysXTargetLib TargetLib;
				if (!Enum.TryParse(TargetLibName, out TargetLib))
				{
					throw new AutomationException(String.Format("Unknown target lib '{0}' specified on command line", TargetLibName));
				}
				else
				{
					TargetLibs.Add(TargetLib);
				}
			}
		}
		return TargetLibs;
	}

	private List<WindowsCompiler> GetTargetWindowsCompilers()
	{
		List<WindowsCompiler> TargetWindowsCompilers = new List<WindowsCompiler>();
		string TargetWindowsCompilersFilter = ParseParamValue("TargetWindowsCompilers", "VisualStudio2015+VisualStudio2013");
		if (TargetWindowsCompilersFilter != null)
		{
			foreach (string TargetWindowsCompilerName in TargetWindowsCompilersFilter.Split(new char[] { '+' }, StringSplitOptions.RemoveEmptyEntries))
			{
				WindowsCompiler TargetWindowsCompiler;
				if (!Enum.TryParse(TargetWindowsCompilerName, out TargetWindowsCompiler))
				{
					throw new AutomationException(String.Format("Unknown target windows compiler '{0}' specified on command line", TargetWindowsCompilerName));
				}
				else
				{
					TargetWindowsCompilers.Add(TargetWindowsCompiler);
				}
			}
		}
		return TargetWindowsCompilers;
	}

	private static void MakeFreshDirectoryIfRequired(UnrealBuildTool.DirectoryReference Directory)
	{
		if (!DirectoryReference.Exists(Directory))
		{
			DirectoryReference.CreateDirectory(Directory);
		}
		else
		{

			InternalUtils.SafeDeleteDirectory(Directory.FullName);
			DirectoryReference.CreateDirectory(Directory);
		}
	}

	public static int RunLocalProcess(Process LocalProcess)
	{
		int ExitCode = -1;

		// release all process resources
		using (LocalProcess)
		{
			LocalProcess.StartInfo.UseShellExecute = false;
			LocalProcess.StartInfo.RedirectStandardOutput = true;

			try
			{
				// Start the process up and then wait for it to finish
				LocalProcess.Start();
				LocalProcess.BeginOutputReadLine();
				LocalProcess.WaitForExit();
				ExitCode = LocalProcess.ExitCode;
			}
			catch (Exception ex)
			{
				throw new BuildException(ex, "Failed to start local process for action (\"{0}\"): {1} {2}", ex.Message, LocalProcess.StartInfo.FileName, LocalProcess.StartInfo.Arguments);
			}
		}

		return ExitCode;
	}

	public static int RunLocalProcessAndLogOutput(ProcessStartInfo StartInfo)
	{
		Process LocalProcess = new Process();
		LocalProcess.StartInfo = StartInfo;
		LocalProcess.OutputDataReceived += (Sender, Line) => { if (Line != null && Line.Data != null) UnrealBuildTool.Log.TraceInformation(Line.Data); };
		return RunLocalProcess(LocalProcess);
	}

	private static void SetupBuildForTargetLibAndPlatform(PhysXTargetLib TargetLib, TargetPlatformData TargetData, List<string> TargetConfigurations, List<WindowsCompiler> TargetWindowsCompilers, bool bCleanOnly)
	{
		// make sure we set up the environment variable specifying where the root of the PhysX SDK is
		Environment.SetEnvironmentVariable("GW_DEPS_ROOT", PhysXSourceRootDirectory.ToString());
		Log("set {0}={1}", "GW_DEPS_ROOT", Environment.GetEnvironmentVariable("GW_DEPS_ROOT"));
		Environment.SetEnvironmentVariable("CMAKE_MODULE_PATH", DirectoryReference.Combine(PhysXSourceRootDirectory, "Externals", "CMakeModules").ToString());
		Log("set {0}={1}", "CMAKE_MODULE_PATH", Environment.GetEnvironmentVariable("CMAKE_MODULE_PATH"));

		string CMakeName = GetCMakeNameAndSetupEnv(TargetData);

		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
				// for windows platforms we support building against multiple compilers
				foreach(WindowsCompiler TargetWindowsCompiler in TargetWindowsCompilers)
				{
					UnrealBuildTool.DirectoryReference CMakeTargetDirectory = GetProjectDirectory(TargetLib, TargetData, TargetWindowsCompiler);
					MakeFreshDirectoryIfRequired(CMakeTargetDirectory);

					if(!bCleanOnly)
					{
						Log("Generating projects for lib " + TargetLib.ToString() + ", " + TargetData.ToString());

						ProcessStartInfo StartInfo = new ProcessStartInfo();
						StartInfo.FileName = CMakeName;
						StartInfo.WorkingDirectory = CMakeTargetDirectory.ToString();
						StartInfo.Arguments = GetCMakeArguments(TargetLib, TargetData, "", TargetWindowsCompiler);

						RunLocalProcessAndLogOutput(StartInfo);
					}
				}
				break;
			case UnrealTargetPlatform.PS4:
			case UnrealTargetPlatform.Android:
			case UnrealTargetPlatform.Linux:
			case UnrealTargetPlatform.Switch:
				foreach (string BuildConfig in TargetConfigurations)
				{
					UnrealBuildTool.DirectoryReference CMakeTargetDirectory = GetProjectDirectory(TargetLib, TargetData);
					CMakeTargetDirectory = UnrealBuildTool.DirectoryReference.Combine(CMakeTargetDirectory, BuildConfig);
					MakeFreshDirectoryIfRequired(CMakeTargetDirectory);

					if (!bCleanOnly)
					{
						Log("Generating projects for lib " + TargetLib.ToString() + ", " + TargetData.ToString());

						ProcessStartInfo StartInfo = new ProcessStartInfo();
						StartInfo.FileName = CMakeName;
						StartInfo.WorkingDirectory = CMakeTargetDirectory.ToString();
						StartInfo.Arguments = GetCMakeArguments(TargetLib, TargetData, BuildConfig);

						System.Console.WriteLine("Working in '{0}'", StartInfo.WorkingDirectory);
						Log("Working in '{0}'", StartInfo.WorkingDirectory);

						System.Console.WriteLine("{0} {1}", StartInfo.FileName, StartInfo.Arguments);
						Log("{0} {1}", StartInfo.FileName, StartInfo.Arguments);
						
						if (RunLocalProcessAndLogOutput(StartInfo) != 0)
						{
							throw new AutomationException(String.Format("Unable to generate projects for {0}.", TargetLib.ToString() + ", " + TargetData.ToString()));
						}
					}
				}
				break;
			case UnrealTargetPlatform.Mac:
			case UnrealTargetPlatform.IOS:
			case UnrealTargetPlatform.TVOS:
				{
					UnrealBuildTool.DirectoryReference CMakeTargetDirectory = GetProjectDirectory(TargetLib, TargetData);
					MakeFreshDirectoryIfRequired(CMakeTargetDirectory);

					if (!bCleanOnly)
					{
						Log("Generating projects for lib " + TargetLib.ToString() + ", " + TargetData.ToString());

						ProcessStartInfo StartInfo = new ProcessStartInfo();
						StartInfo.FileName = CMakeName;
						StartInfo.WorkingDirectory = CMakeTargetDirectory.ToString();
						StartInfo.Arguments = GetCMakeArguments(TargetLib, TargetData);

						RunLocalProcessAndLogOutput(StartInfo);
					}
				}
				break;
			case UnrealTargetPlatform.HTML5:
				// NOTE: HTML5 does not do "debug" - the full text blows out memory
				//	   instead, HTML5 builds have 4 levels of optimizations
				// so, MAP BuildConfig to HTML5 optimization levels
				Dictionary<string, string> BuildMap = new Dictionary<string, string>()
				{
					{"debug", "-O0"},
					{"checked", "-O2"},
					{"profile", "-Oz"},
					{"release", "-O3"}
				};
				UnrealBuildTool.DirectoryReference HTML5CMakeModules = DirectoryReference.Combine(PhysXSourceRootDirectory, "Externals", "CMakeModules", "HTML5");
				MakeFreshDirectoryIfRequired(HTML5CMakeModules);

				foreach(string BuildConfig in TargetConfigurations)
				{
					UnrealBuildTool.DirectoryReference CMakeTargetDirectory = GetProjectDirectory(TargetLib, TargetData);
					CMakeTargetDirectory = UnrealBuildTool.DirectoryReference.Combine(CMakeTargetDirectory, "BUILD" + BuildMap[BuildConfig]);
					MakeFreshDirectoryIfRequired(CMakeTargetDirectory);

					if (!bCleanOnly)
					{
						Log("Generating projects for lib " + TargetLib.ToString() + ", " + TargetData.ToString());

						// CMAKE_TOOLCHAIN_FILE
						Environment.SetEnvironmentVariable("LIB_SUFFIX", GetConfigurationSuffix(BuildConfig, TargetData)); // only used in HTML5's CMakefiles

						string orig = File.ReadAllText(HTML5SDKInfo.EmscriptenCMakeToolChainFile);
						string txt = Regex.Replace(orig, "(EPIC_BUILD_FLAGS}) .*-O2" , "$1 " + BuildMap[BuildConfig] );
						string CmakeToolchainFile = FileReference.Combine(HTML5CMakeModules, "Emscripten." + BuildConfig + ".cmake").ToString();
						File.WriteAllText(CmakeToolchainFile, txt);

						// ----------------------------------------

						// CMAKE
						ProcessStartInfo StartInfo = new ProcessStartInfo();
						StartInfo.FileName = "cmake";
						StartInfo.WorkingDirectory = CMakeTargetDirectory.ToString();
						StartInfo.Arguments = GetCMakeArguments(TargetLib, TargetData, BuildConfig);

						Log("Working in: {0}", StartInfo.WorkingDirectory);
						Log("{0} {1}", StartInfo.FileName, StartInfo.Arguments);
						
						if (RunLocalProcessAndLogOutput(StartInfo) != 0)
						{
							throw new AutomationException(String.Format("Unabled to generate projects for {0}.", TargetLib.ToString() + ", " + TargetData.ToString()));
						}
					}
				}
				break;
			default:
				{
					UnrealBuildTool.DirectoryReference CMakeTargetDirectory = GetProjectDirectory(TargetLib, TargetData);
					MakeFreshDirectoryIfRequired(CMakeTargetDirectory);

					if (!bCleanOnly)
					{
						Log("Generating projects for lib " + TargetLib.ToString() + ", " + TargetData.ToString());

						ProcessStartInfo StartInfo = new ProcessStartInfo();
						StartInfo.FileName = CMakeName;
						StartInfo.WorkingDirectory = CMakeTargetDirectory.ToString();
						StartInfo.Arguments = GetCMakeArguments(TargetLib, TargetData);

						RunLocalProcessAndLogOutput(StartInfo);
					}
				}
				break;
		}
	}

	private static string GetMsDevExe(WindowsCompiler Version)
	{
		DirectoryReference VSPath;
		// It's not fatal if VS2013 isn't installed for VS2015 builds (for example, so don't crash here)
		if(WindowsExports.TryGetVSInstallDir(Version, out VSPath))
		{
			return FileReference.Combine(VSPath, "Common7", "IDE", "Devenv.com").FullName;
		}
		return null;
	}

	private static string GetMsBuildExe(WindowsCompiler Version)
	{
		string VisualStudioToolchainVersion = "";
		switch (Version)
		{
			case WindowsCompiler.VisualStudio2013:
				VisualStudioToolchainVersion = "12.0";
				break;
			case WindowsCompiler.VisualStudio2015:
				VisualStudioToolchainVersion = "14.0";
				break;
		}
		string ProgramFilesPath = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86);
		string MSBuildPath = Path.Combine(ProgramFilesPath, "MSBuild", VisualStudioToolchainVersion, "Bin", "MSBuild.exe");
		if (File.Exists(MSBuildPath))
		{
			return MSBuildPath;
		}
		return null;
	}

	private static string RemoveOtherMakeFromPath(string WindowsPath)
	{
		string[] PathComponents = WindowsPath.Split(';');
		string NewPath = "";
		foreach(string PathComponent in PathComponents)
		{
			// everything what contains /bin or /sbin is suspicious, check if it has make in it
			if (PathComponent.Contains("\\bin") || PathComponent.Contains("/bin") || PathComponent.Contains("\\sbin") || PathComponent.Contains("/sbin"))
			{
				if (File.Exists(PathComponent + "/make.exe") || File.Exists(PathComponent + "make.exe"))
				{
					// gotcha!
					Log("Removing {0} from PATH since it contains possibly colliding make.exe", PathComponent);
					continue;
				}
			}

			NewPath = NewPath + ';' + PathComponent + ';';
		}

		return NewPath;
	}
	private static void SetupBuildEnvironment()
	{
		if (!Utils.IsRunningOnMono)
		{
			string VS2015Path = GetMsDevExe(WindowsCompiler.VisualStudio2015);
			if (VS2015Path != null)
			{
				MsDev14Exe = new UnrealBuildTool.FileReference(GetMsDevExe(WindowsCompiler.VisualStudio2015));
				MsBuildExe = new UnrealBuildTool.FileReference(GetMsBuildExe(WindowsCompiler.VisualStudio2015));
			}

			// ================================================================================
			// ThirdPartyNotUE
			// NOTE: these are Windows executables
			if (BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Win64)
			{
				DirectoryReference ThirdPartyNotUERootDirectory = DirectoryReference.Combine(CommandUtils.RootDirectory, "Engine", "Extras", "ThirdPartyNotUE");
				string CMakePath = DirectoryReference.Combine(ThirdPartyNotUERootDirectory, "CMake", "bin").ToString();
				string MakePath = DirectoryReference.Combine(ThirdPartyNotUERootDirectory, "GNU_Make", "make-3.81", "bin").ToString();

				string PrevPath = Environment.GetEnvironmentVariable("PATH");
				// mixing bundled make and cygwin make is no good. Try to detect and remove cygwin paths.
				string PathWithoutCygwin = RemoveOtherMakeFromPath(PrevPath);
				Environment.SetEnvironmentVariable("PATH", CMakePath + ";" + MakePath + ";" + PathWithoutCygwin);
				Environment.SetEnvironmentVariable("PATH", CMakePath + ";" + MakePath + ";" + Environment.GetEnvironmentVariable("PATH"));
				Log("set {0}={1}", "PATH", Environment.GetEnvironmentVariable("PATH"));
			}
			// ================================================================================
			// HTML5
			// FIXME: only run this if GetTargetPlatforms() contains HTML5

			// override BuildConfiguration defaults - so we can use HTML5SDKInfo
			string EngineSourceDir = GetProjectDirectory(PhysXTargetLib.PhysX, new TargetPlatformData(UnrealTargetPlatform.HTML5)).ToString();
			EngineSourceDir = Regex.Replace(EngineSourceDir, @"\\" , "/");
			EngineSourceDir = Regex.Replace(EngineSourceDir, ".*Engine/" , "");

			if (!HTML5SDKInfo.IsSDKInstalled())
			{
				throw new AutomationException("EMSCRIPTEN SDK TOOLCHAIN NOT FOUND...");
			}
			// warm up emscripten config file
			HTML5SDKInfo.SetUpEmscriptenConfigFile();
			Environment.SetEnvironmentVariable("PATH",
					Environment.GetEnvironmentVariable("EMSCRIPTEN") + ";" +
					Environment.GetEnvironmentVariable("NODEPATH") + ";" +
					Environment.GetEnvironmentVariable("LLVM") + ";" +
					Path.GetDirectoryName(HTML5SDKInfo.Python()) + ";" +
					Environment.GetEnvironmentVariable("PATH"));
			//Log("set {0}={1}", "PATH", Environment.GetEnvironmentVariable("PATH"));
		}
	}

	private static void BuildMSBuildTarget(PhysXTargetLib TargetLib, TargetPlatformData TargetData, List<string> TargetConfigurations, WindowsCompiler TargetWindowsCompiler = WindowsCompiler.VisualStudio2015)
	{
		string SolutionFile = GetTargetLibSolutionFileName(TargetLib, TargetData, TargetWindowsCompiler).ToString();
		string MSDevExe = GetMsDevExe(TargetData);

		if (!FileExists(SolutionFile))
		{
			throw new AutomationException(String.Format("Unabled to build Solution {0}. Solution file not found.", SolutionFile));
		}
		if (String.IsNullOrEmpty(MSDevExe))
		{
			throw new AutomationException(String.Format("Unabled to build Solution {0}. devenv.com not found.", SolutionFile));
		}

		foreach (string BuildConfig in TargetConfigurations)
		{
			string CmdLine = String.Format("\"{0}\" /build \"{1}\"", SolutionFile, BuildConfig);
			RunAndLog(BuildCommand.CmdEnv, MSDevExe, CmdLine);
		}
	}

	private static void BuildXboxTarget(PhysXTargetLib TargetLib, TargetPlatformData TargetData, List<string> TargetConfigurations, WindowsCompiler TargetWindowsCompiler = WindowsCompiler.VisualStudio2015)
	{
		if (TargetData.Platform != UnrealTargetPlatform.XboxOne)
		{
			return;
		}

		string SolutionFile = GetTargetLibSolutionFileName(TargetLib, TargetData, TargetWindowsCompiler).ToString();
		string MSBuildExe = GetMsBuildExe(TargetData);

		if (!FileExists(SolutionFile))
		{
			throw new AutomationException(String.Format("Unabled to build Solution {0}. Solution file not found.", SolutionFile));
		}
		if (String.IsNullOrEmpty(MSBuildExe))
		{
			throw new AutomationException(String.Format("Unabled to build Solution {0}. msbuild.exe not found.", SolutionFile));
		}

		string AdditionalProperties = "";
		string AutoSDKPropsPath = Environment.GetEnvironmentVariable("XboxOneAutoSDKProp");
		if (AutoSDKPropsPath != null && AutoSDKPropsPath.Length > 0)
		{
			AdditionalProperties += String.Format(";CustomBeforeMicrosoftCommonProps={0}", AutoSDKPropsPath);
		}
		string XboxCMakeModulesPath = Path.Combine(PhysXSourceRootDirectory.FullName, "Externals", "CMakeModules", "XboxOne", "Microsoft.Cpp.Durango.user.props");
		if (File.Exists(XboxCMakeModulesPath))
		{
			AdditionalProperties += String.Format(";ForceImportBeforeCppTargets={0}", XboxCMakeModulesPath);
		}

		foreach (string BuildConfig in TargetConfigurations)
		{
			string CmdLine = String.Format("\"{0}\" /t:build /p:Configuration={1};Platform=Durango{2}", SolutionFile, BuildConfig, AdditionalProperties);
			RunAndLog(BuildCommand.CmdEnv, MSBuildExe, CmdLine);
		}
	}

	private static void BuildMakefileTarget(PhysXTargetLib TargetLib, TargetPlatformData TargetData, List<string> TargetConfigurations)
	{
		// FIXME: use absolute path
		string MakeCommand = "make";

		// FIXME: "j -16" should be tweakable
		//string MakeOptions = "-j 1";
		string MakeOptions = "-j 16";

		// Bundled GNU make does not pass job number to subprocesses on Windows, work around that...
		if (BuildHostPlatform.Current.Platform == UnrealTargetPlatform.Win64)
		{
			// Redefining the MAKE variable will cause the -j flag to be passed to child make instances.
			MakeOptions = string.Format("{1} \"MAKE={0} {1}\"", MakeCommand, MakeOptions);
		}

		// this will be replaced for HTML5 - see SetupBuildForTargetLibAndPlatform() for details
		Dictionary<string, string> BuildMap = new Dictionary<string, string>()
		{
			{"debug", "debug"},
			{"checked", "checked"},
			{"profile", "profile"},
			{"release", "release"}
		};

		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Android:
				{
					// Use make from Android toolchain
					string NDKDirectory = Environment.GetEnvironmentVariable("NDKROOT");
		
					// don't register if we don't have an NDKROOT specified
					if (String.IsNullOrEmpty(NDKDirectory))
					{
						throw new BuildException("NDKROOT is not specified; cannot build Android.");
					}
		
					NDKDirectory = NDKDirectory.Replace("\"", "");
		
					MakeCommand = NDKDirectory + "\\prebuilt\\windows-x86_64\\bin\\make.exe";
				}
				break;
			case UnrealTargetPlatform.HTML5:
				{
					// Use emscripten toolchain
					MakeCommand = "python";
					MakeOptions = HTML5SDKInfo.EMSCRIPTEN_ROOT + "\\emmake make";
					BuildMap = new Dictionary<string, string>()
					{
						{"debug", "Build-O0"},
						{"checked", "Build-O2"},
						{"profile", "Build-Oz"},
						{"release", "Build-O3"}
					};
				}
				break;
			default:
				break;
		}

		// makefile build has "projects" for every configuration. However, we abstract away from that by assuming GetProjectDirectory points to the "meta-project"
		foreach (string BuildConfig in TargetConfigurations)
		{
			UnrealBuildTool.DirectoryReference MetaProjectDirectory = GetProjectDirectory(TargetLib, TargetData);
			UnrealBuildTool.DirectoryReference ConfigDirectory = UnrealBuildTool.DirectoryReference.Combine(MetaProjectDirectory, BuildMap[BuildConfig]);
			Environment.SetEnvironmentVariable("LIB_SUFFIX", GetConfigurationSuffix(BuildConfig, TargetData)); // only used in HTML5's CMakefiles
			string Makefile = UnrealBuildTool.FileReference.Combine(ConfigDirectory, "Makefile").ToString();
			if (!FileExists(Makefile))
			{
				throw new AutomationException(String.Format("Unabled to build {0} - file not found.", Makefile));
			}

			ProcessStartInfo StartInfo = new ProcessStartInfo();
			StartInfo.FileName = MakeCommand;
			StartInfo.WorkingDirectory = ConfigDirectory.ToString();
			StartInfo.Arguments = MakeOptions;

			Log("Working in: {0}", StartInfo.WorkingDirectory);
			Log("{0} {1}", StartInfo.FileName, StartInfo.Arguments);

			if (RunLocalProcessAndLogOutput(StartInfo) != 0)
			{
				throw new AutomationException(String.Format("Unabled to build {0}. Build process failed.", Makefile));
			}
		}
	}

	private static void BuildXcodeTarget(PhysXTargetLib TargetLib, TargetPlatformData TargetData, List<string> TargetConfigurations)
	{
		UnrealBuildTool.DirectoryReference Directory = GetProjectDirectory(TargetLib, TargetData);
        string ProjectName = "";

        switch(TargetLib)
        {
            case PhysXTargetLib.APEX:
                ProjectName = "APEX";
                break;
            case PhysXTargetLib.NvCloth:
                ProjectName = "NvCloth";
                break;
            case PhysXTargetLib.PhysX:
                ProjectName = "PhysX";
                break;
            default:
                throw new AutomationException(String.Format("Unabled to build XCode target, Unsupported library {0}.", TargetLib.ToString()));
        }

		string ProjectFile = UnrealBuildTool.FileReference.Combine(Directory, ProjectName + ".xcodeproj").ToString();

		if (!DirectoryExists(ProjectFile))
		{
			throw new AutomationException(String.Format("Unabled to build project {0}. Project file not found.", ProjectFile));
		}

		foreach (string BuildConfig in TargetConfigurations)
		{
			string CmdLine = String.Format("-project \"{0}\" -target=\"ALL_BUILD\" -configuration {1}", ProjectFile, BuildConfig);
			RunAndLog(BuildCommand.CmdEnv, "/usr/bin/xcodebuild", CmdLine);
		}
	}

	private static void BuildTargetLibForPlatform(PhysXTargetLib TargetLib, TargetPlatformData TargetData, List<string> TargetConfigurations, List<WindowsCompiler> TargetWindowsCompilers)
	{
		if (DoesPlatformUseMSBuild(TargetData))
		{
			switch (TargetData.Platform)
			{
				case UnrealTargetPlatform.Win32:
				case UnrealTargetPlatform.Win64:
					// for windows platforms we support building against multiple compilers
					foreach (WindowsCompiler TargetWindowsCompiler in TargetWindowsCompilers)
					{
						BuildMSBuildTarget(TargetLib, TargetData, TargetConfigurations, TargetWindowsCompiler);
					}
					break;
				case UnrealTargetPlatform.XboxOne:
					BuildXboxTarget(TargetLib, TargetData, TargetConfigurations);
					break;
				default:
					BuildMSBuildTarget(TargetLib, TargetData, TargetConfigurations);
					break;
			}
		}
		else if (DoesPlatformUseXcode(TargetData))
		{
			BuildXcodeTarget(TargetLib, TargetData, TargetConfigurations);
		}
		else if (DoesPlatformUseMakefiles(TargetData))
		{
			BuildMakefileTarget(TargetLib, TargetData, TargetConfigurations);
		}
		else
		{
			throw new AutomationException(String.Format("Unsupported target platform '{0}' passed to BuildTargetLibForPlatform", TargetData));
		}
	}

	private static DirectoryReference GetPlatformBinaryDirectory(TargetPlatformData TargetData, WindowsCompiler TargetWindowsCompiler)
	{
		string VisualStudioName = string.Empty;
		string ArchName = string.Empty;

		if (DoesPlatformUseMSBuild(TargetData))
		{
			switch (TargetWindowsCompiler)
			{
				case WindowsCompiler.VisualStudio2013:
					VisualStudioName = "VS2013";
					break;
				case WindowsCompiler.VisualStudio2015:
					VisualStudioName = "VS2015";
					break;
				default:
					throw new AutomationException(String.Format("Unsupported visual studio compiler '{0}' supplied to GetOutputBinaryDirectory", TargetWindowsCompiler));
			}
		}

		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
				ArchName = "Win32";
				break;
			case UnrealTargetPlatform.Win64:
				ArchName = "Win64";
				break;
			case UnrealTargetPlatform.Mac:
				ArchName = "Mac";
				break;
			default:
				throw new AutomationException(String.Format("Unsupported platform '{0}' supplied to GetOutputBinaryDirectory", TargetData.ToString()));
		}

		return UnrealBuildTool.DirectoryReference.Combine(RootOutputBinaryDirectory, ArchName, VisualStudioName);
	}

	private static DirectoryReference GetPlatformLibDirectory(TargetPlatformData TargetData, WindowsCompiler TargetWindowsCompiler)
	{
		string VisualStudioName = string.Empty;
		string ArchName = string.Empty;

		if (DoesPlatformUseMSBuild(TargetData))
		{
			switch (TargetWindowsCompiler)
			{
				case WindowsCompiler.VisualStudio2013:
					VisualStudioName = "VS2013";
					break;
				case WindowsCompiler.VisualStudio2015:
					VisualStudioName = "VS2015";
					break;
				default:
					throw new AutomationException(String.Format("Unsupported visual studio compiler '{0}' supplied to GetOutputLibDirectory", TargetWindowsCompiler));
			}
		}

		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
				ArchName = "Win32";
				break;
			case UnrealTargetPlatform.Win64:
				ArchName = "Win64";
				break;
			case UnrealTargetPlatform.XboxOne:
				ArchName = "XboxOne";
				break;
			case UnrealTargetPlatform.PS4:
				ArchName = "PS4";
				break;
			case UnrealTargetPlatform.Switch:
				ArchName = "Switch";
				break;
			case UnrealTargetPlatform.Android:
				switch (TargetData.Architecture)
				{
					default:
					case "arm7": ArchName = "Android/ARMv7"; break;
					case "arm64": ArchName = "Android/ARM64"; break;
					case "x86": ArchName = "Android/x86"; break;
					case "x64": ArchName = "Android/x64"; break;
				}
				break;
			case UnrealTargetPlatform.Linux:
				ArchName = "Linux/" + TargetData.Architecture;
				break;
			case UnrealTargetPlatform.Mac:
				ArchName = "Mac";
				break;
			case UnrealTargetPlatform.HTML5:
				ArchName = "HTML5";
				break;
			case UnrealTargetPlatform.IOS:
				ArchName = "IOS";
				break;
			case UnrealTargetPlatform.TVOS:
				ArchName = "TVOS";
				break;
			default:
				throw new AutomationException(String.Format("Unsupported platform '{0}' supplied to GetOutputLibDirectory", TargetData.ToString()));
		}

		return UnrealBuildTool.DirectoryReference.Combine(RootOutputLibDirectory, ArchName, VisualStudioName);
	}

	private static bool PlatformHasBinaries(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
			case UnrealTargetPlatform.Mac:
				return true;
		}
		return false;
	}
	private static bool PlatformUsesDebugDatabase(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
//			case UnrealTargetPlatform.Mac:
			case UnrealTargetPlatform.XboxOne:
				return true;
		}
		return false;
	}
	private static string GetPlatformDebugDatabaseExtension(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
			case UnrealTargetPlatform.XboxOne:
				return "pdb";
			case UnrealTargetPlatform.Mac:
				return "dSYM";
		}
		throw new AutomationException(String.Format("No debug database extension for platform ", TargetData.Platform.ToString()));
	}

	private static string GetPlatformBinaryExtension(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
				return "dll";
			case UnrealTargetPlatform.Mac:
				return "dylib";
		}
		throw new AutomationException(String.Format("No binary extension for platform ", TargetData.Platform.ToString()));
	}

	private static string GetPlatformLibExtension(TargetPlatformData TargetData)
	{
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
			case UnrealTargetPlatform.Win64:
			case UnrealTargetPlatform.XboxOne:
				return "lib";
			case UnrealTargetPlatform.PS4:
			case UnrealTargetPlatform.Android:
			case UnrealTargetPlatform.Linux:
			case UnrealTargetPlatform.Mac:
			case UnrealTargetPlatform.IOS:
			case UnrealTargetPlatform.TVOS:
			case UnrealTargetPlatform.Switch:
				return "a";
			case UnrealTargetPlatform.HTML5:
				return "bc";
		}
		throw new AutomationException(String.Format("No lib extension for platform ", TargetData.Platform.ToString()));
	}

    private static bool FileGeneratedByLib(string FileNameUpper, PhysXTargetLib TargetLib)
    {
        switch(TargetLib)
        {
            case PhysXTargetLib.APEX:
                return FileGeneratedByAPEX(FileNameUpper);
            case PhysXTargetLib.NvCloth:
                return FileGeneratedByNvCloth(FileNameUpper);
            default:
                break;
        }

        // Must have been PhysX if we got here, if it wasn't generated by other libs, then it's PhysX
        return !FileGeneratedByAPEX(FileNameUpper) && !FileGeneratedByNvCloth(FileNameUpper);
    }

    private static bool FileGeneratedByNvCloth(string FileNameUpper)
    {
        if(FileNameUpper.StartsWith("NVCLOTH"))
        {
            return true;
        }

        return false;
    }
    
	private static bool FileGeneratedByAPEX(string FileNameUpper)
	{
		if (FileNameUpper.StartsWith("APEX"))
		{
			return true;
		}
		else
		{
			foreach (string SpecialApexLib in APEXSpecialLibs)
			{
				if (FileNameUpper.StartsWith(SpecialApexLib.ToUpper()))	//There are some APEX libs that don't use the APEX prefix so make sure to test against it
				{
					return true;
				}
			}
		}

		return false;
	}

	private static void FindOutputFilesHelper(HashSet<FileReference> OutputFiles, DirectoryReference BaseDir, string SearchPrefix, PhysXTargetLib TargetLib)
	{
		if(!DirectoryReference.Exists(BaseDir))
		{
			return;
		}

		foreach (FileReference FoundFile in DirectoryReference.EnumerateFiles(BaseDir, SearchPrefix))
		{
			string FileNameUpper = FoundFile.GetFileName().ToString().ToUpper();
			
			if(FileGeneratedByLib(FileNameUpper, TargetLib))
			{
				OutputFiles.Add(FoundFile);
			}
		}
	}

	private static string GetConfigurationSuffix(string TargetConfiguration, TargetPlatformData TargetData)
	{
		// default
		Dictionary<string, string> BuildSuffix = new Dictionary<string, string>()
		{
			{"debug", "debug"},
			{"checked", "checked"},
			{"profile", "profile"},
			{"release", ""}
		};

		if (TargetData.Platform == UnrealTargetPlatform.HTML5)
		{
			// HTML5 - see SetupBuildForTargetLibAndPlatform() for details
			BuildSuffix = new Dictionary<string, string>()
			{
				{"debug", ""},
				{"checked", "_O2"},
				{"profile", "_Oz"},
				{"release", "_O3"}
			};
		}

		return BuildSuffix[TargetConfiguration];
	}

	private static void FindOutputFiles(HashSet<FileReference> OutputFiles, PhysXTargetLib TargetLib, TargetPlatformData TargetData, string TargetConfiguration, WindowsCompiler TargetWindowsCompiler = WindowsCompiler.VisualStudio2015)
	{
		string SearchSuffix = GetConfigurationSuffix(TargetConfiguration, TargetData).ToUpper();
		switch (TargetData.Platform)
		{
			case UnrealTargetPlatform.Win32:
				SearchSuffix += "_x86";
				break;
			case UnrealTargetPlatform.Win64:
				SearchSuffix += "_x64";
				break;
		}
		string SearchPrefix = "*" + SearchSuffix + ".";

		string DebugExtension = PlatformUsesDebugDatabase(TargetData) ? GetPlatformDebugDatabaseExtension(TargetData) : "";

		if (PlatformHasBinaries(TargetData))
		{
			DirectoryReference BinaryDir = GetPlatformBinaryDirectory(TargetData, TargetWindowsCompiler);
			FindOutputFilesHelper(OutputFiles, BinaryDir, SearchPrefix + GetPlatformBinaryExtension(TargetData), TargetLib);

			if (PlatformUsesDebugDatabase(TargetData))
			{
				FindOutputFilesHelper(OutputFiles, BinaryDir, SearchPrefix + DebugExtension, TargetLib);
			}
		}

		DirectoryReference LibDir = GetPlatformLibDirectory(TargetData, TargetWindowsCompiler);
		FindOutputFilesHelper(OutputFiles, LibDir, SearchPrefix + GetPlatformLibExtension(TargetData), TargetLib);

		if (PlatformUsesDebugDatabase(TargetData))
		{
			FindOutputFilesHelper(OutputFiles, LibDir, SearchPrefix + DebugExtension, TargetLib);
		}
	}

	private static bool PlatformSupportsTargetLib(PhysXTargetLib TargetLib, TargetPlatformData TargetData)
	{
		if(TargetLib == PhysXTargetLib.APEX)
		{
			switch (TargetData.Platform)
			{
				case UnrealTargetPlatform.Win32:
				case UnrealTargetPlatform.Win64:
				case UnrealTargetPlatform.PS4:
				case UnrealTargetPlatform.XboxOne:
				case UnrealTargetPlatform.Mac:
				case UnrealTargetPlatform.Switch:
					return true;
				case UnrealTargetPlatform.Linux:
					// only x86_64 Linux supports it.
					return TargetData.Architecture.StartsWith("x86_64");
				default:
					return false;
			}
		}

        if(TargetLib == PhysXTargetLib.NvCloth)
        {
            switch(TargetData.Platform)
            {
                case UnrealTargetPlatform.Win32:
                case UnrealTargetPlatform.Win64:
                case UnrealTargetPlatform.PS4:
                case UnrealTargetPlatform.XboxOne:
                case UnrealTargetPlatform.Mac:
                    return true;
                case UnrealTargetPlatform.Linux:
                    // only x86_64 Linux supports it.
                    return TargetData.Architecture.StartsWith("x86_64");
                default:
                    return false;
            }
        }

		return true;
	}

	public override void ExecuteBuild()
	{
		SetupBuildEnvironment();

		bool bBuildSolutions = true;
		if (ParseParam("SkipBuildSolutions"))
		{
			bBuildSolutions = false;
		}

		bool bBuildLibraries = true;
		if (ParseParam("SkipBuild"))
		{
			bBuildLibraries = false;
		}

		bool bAutoCreateChangelist = true;
		if (ParseParam("SkipCreateChangelist"))
		{
			bAutoCreateChangelist = false;
		}

		bool bAutoSubmit = bAutoCreateChangelist;
		if (ParseParam("SkipSubmit"))
		{
			bAutoSubmit = false;
		}

		// Parse out the libs we want to build
		List<PhysXTargetLib> TargetLibs = GetTargetLibs();

		// get the platforms we want to build for
		List<TargetPlatformData> TargetPlatforms = GetTargetPlatforms();

		// get the platforms we want to build for
		List<WindowsCompiler> TargetWindowsCompilers = GetTargetWindowsCompilers();

		// get the configurations we want to build for
		List<string> TargetConfigurations = GetTargetConfigurations();

		if (bBuildSolutions)
		{
			foreach (PhysXTargetLib TargetLib in TargetLibs)
			{
				// build target lib for all platforms
				foreach (TargetPlatformData TargetData in TargetPlatforms)
				{
					if (!PlatformSupportsTargetLib(TargetLib, TargetData))
					{
						continue;
					}

					SetupBuildForTargetLibAndPlatform(TargetLib, TargetData, TargetConfigurations, TargetWindowsCompilers, false);
				}
			}
		}

		HashSet<FileReference> FilesToReconcile = new HashSet<FileReference>();
		if (bBuildLibraries)
		{
			foreach (PhysXTargetLib TargetLib in TargetLibs)
			{
				// build target lib for all platforms
				foreach (TargetPlatformData TargetData in TargetPlatforms)
				{
					if(!PlatformSupportsTargetLib(TargetLib, TargetData))
					{
						continue;
					}

					HashSet<FileReference> FilesToDelete = new HashSet<FileReference>();
					foreach (string TargetConfiguration in TargetConfigurations)
					{
						// Delete output files before building them
						switch (TargetData.Platform)
						{
							case UnrealTargetPlatform.Win32:
							case UnrealTargetPlatform.Win64:
								foreach (WindowsCompiler TargetCompiler in TargetWindowsCompilers)
								{
									FindOutputFiles(FilesToDelete, TargetLib, TargetData, TargetConfiguration, TargetCompiler);
								}
								break;
							default:
								FindOutputFiles(FilesToDelete, TargetLib, TargetData, TargetConfiguration);
								break;
						}
					}
					
					foreach(FileReference FileToDelete in FilesToDelete)
					{
						FilesToReconcile.Add(FileToDelete);
						InternalUtils.SafeDeleteFile(FileToDelete.ToString());
					}

					BuildTargetLibForPlatform(TargetLib, TargetData, TargetConfigurations, TargetWindowsCompilers);
				}
			}
		}

		int P4ChangeList = InvalidChangeList;
		if (bAutoCreateChangelist)
		{
			string LibDeploymentDesc = "";

            foreach(PhysXTargetLib Lib in TargetLibs)
			{
                if(LibDeploymentDesc.Length != 0)
                {
                    LibDeploymentDesc += " & ";
			}

                LibDeploymentDesc += Lib.ToString();
			}

			foreach (TargetPlatformData TargetData in TargetPlatforms)
			{
				LibDeploymentDesc += " " + TargetData.ToString();
			}

            P4ChangeList = P4.CreateChange(P4Env.Client, String.Format("BuildPhysX.Automation: Deploying {0} libs.", LibDeploymentDesc) + Environment.NewLine + "#rb none" + Environment.NewLine + "#lockdown Nick.Penwarden" + Environment.NewLine + "#tests none");
		}


		if (P4ChangeList != InvalidChangeList)
		{
			foreach (PhysXTargetLib TargetLib in TargetLibs)
			{
				foreach (string TargetConfiguration in TargetConfigurations)
				{
					//Add any new files that p4 is not yet tracking.
					foreach (TargetPlatformData TargetData in TargetPlatforms)
					{
						if (!PlatformSupportsTargetLib(TargetLib, TargetData))
						{
							continue;
						}


						switch (TargetData.Platform)
						{
							case UnrealTargetPlatform.Win32:
							case UnrealTargetPlatform.Win64:
										foreach (WindowsCompiler TargetCompiler in TargetWindowsCompilers)
								{
											FindOutputFiles(FilesToReconcile, TargetLib, TargetData, TargetConfiguration, TargetCompiler);
								}
								break;
							default:
										FindOutputFiles(FilesToReconcile, TargetLib, TargetData, TargetConfiguration);
								break;
						}
					}
				}
			}
			
			foreach(FileReference FileToReconcile in FilesToReconcile)
			{
				P4.Reconcile(P4ChangeList, FileToReconcile.ToString());
			}
		}

		if(bAutoSubmit && (P4ChangeList != InvalidChangeList))
		{
			if (!P4.TryDeleteEmptyChange(P4ChangeList))
			{
				Log("Submitting changelist " + P4ChangeList.ToString());
				int SubmittedChangeList = InvalidChangeList;
				P4.Submit(P4ChangeList, out SubmittedChangeList);
			}
			else
			{
				Log("Nothing to submit!");
			}
		}
	}
}