JSBSim installation on ubuntu 20.04 and connectivity with unreal engine 5.5

[KyriakosChris]

Hello, i have issues with the JSBsim for unreal plugin installation
Firstly, I copied the plugin folder from your UEReferenceAppproject in my engine plugin folder and then i used this script /JSBSimForUnrealLinux.sh to build the JSBsim. Afterwards i used this script to generate project files, ./GenerateProjectFiles.sh, and finally i tried to open my project.

I was able to see the plugin, i enabled it, and restarted the editor. There is my issue, it says that it has compatibility issues for these modules JSBSimFlightDynamicsModel, JSBSimFlightDynamicsModelEditor.

Do you have any idea how to solve it?

Thank you!! :)

[bcoconni]

Hi @KyriakosChris, your issue has been converted to a discussion since it is neither a bug report nor a feature request.

There is my issue, it says that it has compatibility issues for these modules JSBSimFlightDynamicsModel, JSBSimFlightDynamicsModelEditor.

Could you be more specific about the compatibility issues you are getting ?

[KyriakosChris]

Hello @bcoconni,

I do not know if that helps you, here are my log outputs:

The errors says that in these two .cpp files, are a duplicate Implement_module
JSBSimModule.cpp ---> IMPLEMENT_MODULE(FJSBSimModule, JSBSimFlightDynamicsModel)
JSBSimFlightDynamicsModel.cpp ---> IMPLEMENT_MODULE(FJSBSimFlightDynamicsModelModule, JSBSimFlightDynamicsModel)

I tried to keep only one from having it, but it produces so many errors, so i am not sure if removing any of these implements will solve it. Do you have any idea what to do?

LogInit: Warning: Incompatible or missing module: JSBSimFlightDynamicsModel
LogInit: Warning: Incompatible or missing module: JSBSimFlightDynamicsModelEditor
LogInit: Initializing SDL.
LogInit: Initialized SDL 2.30.6 revision: SDL-2.30.6-no-vcs (compiled against 2.30.6)
LogInit: Using SDL video driver 'x11'
LogInit: Display metrics:
LogInit: PrimaryDisplayWidth: 1920
LogInit: PrimaryDisplayHeight: 1080
LogInit: PrimaryDisplayWorkAreaRect:
LogInit: Left=72, Top=27, Right=1920, Bottom=1080
LogInit: VirtualDisplayRect:
LogInit: Left=72, Top=0, Right=3840, Bottom=1080
LogInit: TitleSafePaddingSize: X=0.000 Y=0.000 Z=0.000 W=0.000
LogInit: ActionSafePaddingSize: X=0.000 Y=0.000 Z=0.000 W=0.000
LogInit: Number of monitors: 2
LogInit: Monitor 0
LogInit: Name: HP E243 24"
LogInit: ID: display0
LogInit: NativeWidth: 1920
LogInit: NativeHeight: 1080
LogInit: bIsPrimary: true
LogInit: Monitor 1
LogInit: Name: DELL S2421H 24"
LogInit: ID: display1
LogInit: NativeWidth: 1920
LogInit: NativeHeight: 1080
LogInit: bIsPrimary: false
STUBBED: FDesktopPlatformLinux::GetNativeFeedbackContext at ./Developer/DesktopPlatform/Private/Linux/DesktopPlatformLinux.cpp:564 (GetNativeFeedbackContext)
Running /home/ide/unreal5/Linux_Unreal_Engine_5.5.0/Engine/Build/BatchFiles/Linux/Build.sh Development Linux -Project="/home/ide/unreal_projects/Plugin/Plugin.uproject" -TargetType=Editor -Progress -NoEngineChanges -NoHotReloadFromIDE
Setting up bundled DotNet SDK
Running command : dotnet Engine/Binaries/DotNET/UnrealBuildTool/UnrealBuildTool.dll Development Linux -Project=/home/ide/unreal_projects/Plugin/Plugin.uproject -TargetType=Editor -Progress -NoEngineChanges -NoHotReloadFromIDE
Log file: /home/ide/.config/Epic/UnrealBuildTool/Log.txt
Invalidating makefile for PluginEditor (JSBSim.uplugin has been added)
Shutdown handler: cleanup.
@progress push 5%
Parsing headers for PluginEditor
Running Internal UnrealHeaderTool /home/ide/unreal_projects/Plugin/Plugin.uproject /home/ide/unreal_projects/Plugin/Intermediate/Build/Linux/PluginEditor/Development/PluginEditor.uhtmanifest -WarningsAsErrors -installed
Total of 5 written
Reflection code generated for PluginEditor in 2.6991213 seconds
@progress pop
------- Build details --------
Using toolchain located at '/home/ide/unreal5/Linux_Unreal_Engine_5.5.0/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v23_clang-18.1.0-rockylinux8/x86_64-unknown-linux-gnu'.
Using clang (/home/ide/unreal5/Linux_Unreal_Engine_5.5.0/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v23_clang-18.1.0-rockylinux8/x86_64-unknown-linux-gnu/bin/clang++) version 'clang version 18.1.0rc (github.com/llvm/llvm-project 461274b81d8641eab64d494accddc81d7db8a09e)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /home/ide/unreal5/Linux_Unreal_Engine_5.5.0/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v23_clang-18.1.0-rockylinux8/x86_64-unknown-linux-gnu/bin' (string), 18 (major), 1 (minor), 0 (patch)
Using bundled libc++ standard C++ library.
Using lld linker
Using llvm-ar (/home/ide/unreal5/Linux_Unreal_Engine_5.5.0/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v23_clang-18.1.0-rockylinux8/x86_64-unknown-linux-gnu/bin/llvm-ar) version 'LLVM (http://llvm.org/):
LLVM version 18.1.0rc
Optimized build. (string)'
Using fast way to relink circularly dependent libraries (no FixDeps).
Compressing debug files
Targeted minimum CPU architecture: None

Building PluginEditor...
[Adaptive Build] Excluded from JSBSim unity file: JSBSim.cpp
[Adaptive Build] Excluded from JSBSimFlightDynamicsModel unity file: JSBSimModule.cpp, FDMTypes.cpp, UEGroundCallback.cpp, JSBSimMovementComponent.cpp, JSBSimFlightDynamicsModel.cpp
[Adaptive Build] Excluded from JSBSimFlightDynamicsModelEditor unity file: JSBSimMovementCompVisualizer.cpp, JSBSimModuleEditor.cpp
Determining max actions to execute in parallel (8 physical cores, 16 logical cores)
Executing up to 8 processes, one per physical core
Using Unreal Build Accelerator local executor to run 15 action(s)
Storage capacity 40Gb
---- Starting trace ----
UbaSessionServer - Disable remote execution (remote sessions will finish current processes)
------ Building 15 action(s) started ------
[1/15] Compile FDMTypes.cpp
[2/15] Compile Module.JSBSim.cpp
[3/15] Compile JSBSim.cpp
[4/15] Compile JSBSimFlightDynamicsModel.cpp
[5/15] Link (lld) libUnrealEditor-JSBSim.so (UBA disabled)
[6/15] Compile JSBSimModule.cpp
[7/15] Compile UEGroundCallback.cpp
[8/15] Compile Module.JSBSimFlightDynamicsModelEditor.cpp
[9/15] Compile Module.JSBSimFlightDynamicsModel.cpp
[10/15] Compile JSBSimMovementCompVisualizer.cpp
[11/15] Compile JSBSimMovementComponent.cpp
[12/15] Link (lld) libUnrealEditor-JSBSimFlightDynamicsModel.so (UBA disabled)
ld.lld: error: duplicate symbol: IMPLEMENT_MODULE_JSBSimFlightDynamicsModel

defined at JSBSimModule.cpp:23 (/home/ide/unreal_projects/Plugin/Plugins/JSBSim/Source/JSBSimFlightDynamicsModel/Private/JSBSimModule.cpp:23)
/home/ide/unreal_projects/Plugin/Plugins/JSBSim/Intermediate/Build/Linux/x64/UnrealEditor/Development/JSBSimFlightDynamicsModel/JSBSimModule.cpp.o:(IMPLEMENT_MODULE_JSBSimFlightDynamicsModel)
defined at JSBSimFlightDynamicsModel.cpp:17 (/home/ide/unreal_projects/Plugin/Plugins/JSBSim/Source/JSBSimFlightDynamicsModel/Private/JSBSimFlightDynamicsModel.cpp:17)
/home/ide/unreal_projects/Plugin/Plugins/JSBSim/Intermediate/Build/Linux/x64/UnrealEditor/Development/JSBSimFlightDynamicsModel/JSBSimFlightDynamicsModel.cpp.o:(.text+0x40)
clang++: error: linker command failed with exit code 1 (use -v to see invocation)
[13/15] Compile JSBSimModuleEditor.cpp
Trace file written to /home/ide/.config/Epic/UnrealBuildTool/Log.uba with size 4.6kb
Total time in Unreal Build Accelerator local executor: 8.92 seconds
Total execution time: 14.93 seconds
LogInit: Warning: Still incompatible or missing module: JSBSimFlightDynamicsModel
LogInit: Warning: Still incompatible or missing module: JSBSimFlightDynamicsModelEditor
LogCore: Engine exit requested (reason: EngineExit() was called)
LogAudio: Display: Beginning Audio Device Manager Shutdown (Module: )...
LogAudio: Display: Audio Device Manager Shutdown
LogExit: Preparing to exit.
LogIris: FNetObjectFactoryRegistry::UnregisterFactory is unregistering factory: None name: NetActorFactory id: 0
LogIris: FNetObjectFactoryRegistry::UnregisterFactory is unregistering factory: None name: NetSubObjectFactory id: 1
LogPakFile: Destroying PakPlatformFile
LogExit: Exiting.
LogInit: Tearing down SDL.
Exiting abnormally (error code: 1)

[KyriakosChris]

hello, @bcoconni
After some investigation, I found that in Unreal Engine version 4.*, we could use multiple implementation modules per module. However, in newer versions of Unreal Engine, 5.0 and above, we can't do this anymore. The issue is that I downloaded the plugin for Unreal Engine 5, so I am a bit confuse, maybe the plugin wasn't perfectly converted for the newer versions. Do you have any idea?

[gallonmate]

Linux support was added by @demonixis in August 2023. You can try UE5.2, which was the newest engine version at the time.