BuildSystem
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lipengzha
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接收命令行参数控制程序编译行为

在 build.cs 以及 target.cs 中可以获取命令行参数，对编译选项进行控制：

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string[] CmdArgs = Environment.GetCommandLineArgs();
foreach (string CmdLineArg in CmdArgs)
{
    Console.WriteLine("CmdLineArg: " + CmdLineArg);
}

编译时输出：

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0>E:\UnrealEngine\Launcher\UE_4.26\Engine\Build\BatchFiles\Build.bat GWorldEditor Win64 Development -Project="E:\UnrealProjects\GWorld\GWorld.uproject" -WaitMutex -FromMsBuild -test
0>CmdLineArg: ..\..\Engine\Binaries\DotNET\UnrealBuildTool.exe
0>CmdLineArg: GWorldEditor
0>CmdLineArg: Win64
0>CmdLineArg: Development
0>CmdLineArg: -Project=E:\UnrealProjects\GWorld\GWorld.uproject
0>CmdLineArg: -WaitMutex
0>CmdLineArg: -FromMsBuild
0>CmdLineArg: -test

基于传递的参数可以动态地修改编译行为，比如添加宏、依赖的模块等。

以动态开启 ASAN 的方法，开启 ADDRESS SANITIZER，可以更好的进行内存异常访问分析：iOS Address Sanitizer in UE4

在 Target.cs 中开启：

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Environment.SetEnvironmentVariable("ENABLE_ADDRESS_SANITIZER", "YES");

使用命令行控制在打包阶段是否开启 ASAN：

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string[] CmdArgs = Environment.GetCommandLineArgs();
foreach (string CmdLineArg in CmdArgs)
{
	if (CmdLineArg.Equals("-asan"))
	{
		if (Target.Platform == UnrealTargetPlatform.Mac || 
		    Target.Platform == UnrealTargetPlatform.IOS)
		{
			Environment.SetEnvironmentVariable("ENABLE_ADDRESS_SANITIZER", "YES");
		}
	}
}

在打包时传递 -asan 参数给 UBT 即可，