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30 lines
2.2 KiB
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30 lines
2.2 KiB
Plaintext
Availability: NoPublish
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Title: Introduction to BuildGraph
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Crumbs: %ROOT%, Programming, Programming/Development, Programming/Development/BuildGraph
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Description:This page introduces you to our BuildGraph scripting system.
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version: 4.13
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parent:Programming/Development/BuildGraph
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type:Reference
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**BuildGraph** is a system that runs BuildGraph scripts for build automation (with building blocks common to Unreal Engine 4 (UE4) projects).
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BuildGraph integrates with UnrealBuildTool, AutomationTool, and the editor. Which means that BuildGraph can be extended and customized for your projects.
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BuildGraph scripts are written with [XML](https://www.w3.org/TR/NOTE-dcd]), specifying a graph of user-defined nodes with
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dependencies between them. Each node consists of tasks executed in sequence to produce some sort of output (i.e., compile
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this project, then cook, run this test, and so on). When asked to build a target (that is, a node or named output) BuildGraph
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will execute all of the nodes in the graph required to make that happen.
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Unlike other build tools, BuildGraph is designed as a hybrid between a makefile-like scripting language and a build farm
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configuration script. It allows annotations for the type of machine that steps are supposed to be executed on, providing a
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list of recipients for failure notifications if a step fails, and groups nodes that should only be executed after an explicit
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user trigger. It also tracks the creation of output files from task execution in a way that lends to graph execution being
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distributed across a farm of machines (with nodes running in parallel where possible), and intermediate artifacts being
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transferred to and from a network share automatically.
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Epic uses BuildGraph to prepare the UE4 binary release, package samples for the marketplace, and implement pipelines for our
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own games (among other things). Several example BuildGraph scripts are provided in the
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`[UE4Root]/Engine/Build/Graph/Examples` directory, and the script for creating a binary UE4 distribution can be found at
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`[UE4Root]/Engine/Build/InstalledEngineBuild.xml`.
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Opening a script with Visual Studio will use the schema located at `[UE4Root]Engine/Build/Graph/Schema.xsd` to provide rich
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tooltips, validation, and Intellisense features while editing. |