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Building a C++ project.md

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2020-10-02_12:42:00

Building a C++ project

How a project is built depends on the type of project files that has been generated for it. Makefile projects are built by running make <ProjectName>Editor for an editor build and make <ProjectName> for a game build. Debug builds are built by adding -Linux-Debug to the end. CMake projects are built by first creating a new directory for the project files, cmake-build for example, and in that directory runcmake ... After that you have a Makefile that can be used as above.

make <ProjectName>
make <ProjectName>Editor
make <ProjectName>-Linux-Debug
make <ProjectName>Editor-Linux-Debug

We clean the project from build files by passing ARGS="-clean"' to make.

make <ProjectName> ARGS="-clean"

All the variants above all ultimately reach the build scripts shipped with Unreal Engine. These can be invoked manually. Here are a few variants that I've seen recommended:

  • <UnrealRoot>/Engine/Build/BatchFiles/Linux/Build.sh <ProjectName> Linux Development -project=<UnrealProjectsDir>/<ProjectName>/<ProjectName>.uproject -game -progress -buildscw"
  • <UnrealRoot>/Engine/Build/BatchFiles/Linux/Build.sh <ProjectName>Editor Linux Development -Project=<PATH TO UPROJECT>

One can also run UnrealBuildTool directly. Not sure if this works as-is on Linux, or if something mono-related must be done as well. Compare with the contents of the build scripts to make sure, I guess they end up with a similar command line at the end.

  • <UnrealRoot>/Engine/Binaries/DotNET/UnrealBuildTool.exe Development Linux -Project="projectpath.uproject" -TargetType=Editor -Progress -NoEngineChanges -NoHotReloadFromIDE