Unable to open CLion in UE4.20 in Linux

[YashBansod]

I built UE4 from source (Master branch)
Then I create a basic c++ project with starter content.
I selected my source code editor as CLion.

In File => Refresh Clion Project works fine.

But, when I try File => Open Clion it pops a dialog box saying:
Could not open CLion for project /home/uidk4283/Documents/UnrealProjects4.19/MyProject/MyProject.workspace
Note: I couldn't fine Clion in Edit=> Project Settings and setting the path of executable for Clion as we used to do for <=UE4.18

To get things working, I manually open CLion and open the UE4 project in it. I set up the compiler as clang in the setting of CLion and reload the CMake project.
But, I get error. The last few lines of the error are:

clang: error: no such file or directory: '('
clang: error: no such file or directory: ')'
clang: error: no such file or directory: '='
clang: error: no such file or directory: '('
clang: error: no such file or directory: ')'
clang: error: no such file or directory: '='

[RicardoEPRodrigues]

Maybe this is related with #91 ?

[S-Marais]

the plugin has only one default path to find CLion /opt/clion/bin/clion.sh
If you don't have CLion installed there it won't find it. I wish we could still set the path to CLion ourselves.

Since UE 4.19 CLion plugins is hold directly in the UE repository and its version is 2.0. This repository is holding the 1.07 version (Just a reminder).

[S-Marais]

@YashBansod so to have this working natively you will need to edit /path/to/UE_4.19/Engine/Plugins/Developer/CLionSourceCodeAccess/Source/CLionSourceCodeAccess/PrivateCLionSourceCodeAccessor.cpp and near the bottom of the file for the Linux part change the hard coded path to CLion to you correct CLion path.

For now you will have to change the path each time you update CLion (if you are using the JetBrains Toolbox as I do).

As for the compiler error there is a merge in the Editor that should fix the issue very soon as it's status is Waiting for Merge

[btwolfe]

I'm working with Ubuntu 18.04 and Unreal 4.21.2 and see the same error as the original post. I Tried following the path mentioned by @S-Marais to edit that file but the directory path has a typo and should be /path/to/UE_4.19/Engine/Plugins/Developer/CLionSourceCodeAccess/Source/CLionSourceCodeAccess/Private/CLionSourceCodeAccessor.cpp. Regardless, that cpp code has no hardcoded path so this is no longer the solution. My CLion is installed in /opt/clion-2018.3.4/.

Any other suggestions would be appreciated.

[S-Marais]

As far as I'm concerned the path for CLion is still hardcoded in 4.21. But I've forked the Engine to make quite a few changes to UBT and the CLion plugin and I have it working properly on Linux, Windows and Mac. If you head to this page https://github.com/EpicGames/UnrealEngine/compare/release...S-Marais:release the File Changed tab will give you all the changes I made

[RicardoEPRodrigues]

Hello @btwolfe, following what @S-Marais say, the only path currently searched by Unreal is /opt/clion/bin/clion.sh, if you want to have little trouble create a soft link to have the correct path: ln /opt/clion-2018.3.4 /opt/clion.

Regardless, that cpp code has no hardcoded path so this is no longer the solution.

I just visited the CLionSourceCodeAccessor.cpp in the repo and the path is hardcoded in line 275.

There is already a pull request with corrections pending to be included in the main repo: https://github.com/EpicGames/UnrealEngine/pull/5006
@S-Marais This is your pull request for those changes correct?

---

On a side note, a pull request for Hot Reloading in Linux is also pending: https://github.com/EpicGames/UnrealEngine/pull/5287

I've been struggling with using UE4 on Linux for some time now, and since 4.20 I think it is starting to become a stable and easy to setup engine. It is only missing some essential pull requests.

[btwolfe]

Ooops, I was looking at the CLionSourceCodeAccessModule.cpp file, which has no hard-coded paths in it. Anyway, I'll just go with the symbolic link ln -s /opt/clion-2018.3.4 /opt/clion for now so I can focus on my code development.

Incidentally @RicardoEPRodrigues , I am struggling with UE4 on Ubuntu 18.04 as well. It's a major PITA. I've tried QTCreator, CodeLite, VSCode, and now CLion to get an IDE that works with Unreal. With the above symlink, I can now get CLion to come up in Unreal from the File->Open CLion option, but now it's complaining that my lnotify setting is too low (7), so had to boost that per https://confluence.jetbrains.com/display/IDEADEV/Inotify+Watches+Limit . To further complicate things, I'm also trying to compile UE4 against ROS2, so it's a nightmare trying to get the IDE to know about the include paths, UE plugins, and external libraries. I realize this if off topic, but I'd love to hear if you have had success with any IDE with UE4 and linux.

[S-Marais]

@RicardoEPRodrigues yes these are mine.

@btwolfe keep in mind the actual CLion plugin in UE does not clear the CMakeLists.txt as it use to prior its merge in UE. The version I've PR puts a lot more effort directly in UBT to compute out a much cleaner and a much more usable file to manage our projects

[btwolfe]

@S-Marais Are you saying the UE4 File->Refresh CLion project command in UE4 is insufficient to update the CMakeLists.txt file? Don't know if this is related but CLion is unable to Intellisense ("file not found" when hovering mouse over problematic includes in code) any Engine includes nor any include that is from my UE4 plugins that are part of my project.

[S-Marais]

@btwolfe Not exactly it will refresh the CMakeLists.txt but it will populate it with ALL the files from UE too. If you edit the file yourself, each time you will refresh your project it will erase any of your changes

[btwolfe]

That might explain why it's compiling 436 cpp files with a build (taking forever). So those changes you mentioned in your release fix this so it only compiles my project's code?

[S-Marais]

yes it should only compile a few files.

[RicardoEPRodrigues]

To avoid compiling the engine all the time I created Rocket Builds.

TL;DR - Rocket builds are a build of the engine without all the code, basically is a build easy for distribution.

@reapazor has an amazing tutorial to build them, although I think I had to tweak it a bit to work in Linux: https://reapazor.com/2017/08/17/building-a-rocket-build-from-the-unreal-engine-source-code/

I basically compile the engine on time to have a working Engine build, then create a Rocket Build and use it for my daily work. It no longer recompiles the whole engine and is easier to maintain. I also make a copy into an USB not only to prevent accidents, but also to install the same version anywhere I want.

NOTE: Do not create a build and put it publicly online! UE4 is NOT open-source, in that when they grant you access to the code, you cannot distribute it!

[btwolfe]

Having gotten past the whole 436 ccp file compile, I'll try inserting your release changes if I can ever get a successful compile. The compile completes with errors and it appears CLion is confused about standard UE class definitions. It thinks the Unreal AActor class does not define a method GetActorLabel().

In file included from /home/tuser/UnrealProjects/TestLinuxCPP/Plugins/ROSIntegration/Intermediate/Build/Linux/B4D820EA/TestLinuxCPP/Development/ROSIntegration/Module.ROSIntegration.cpp:52:
/home/tuser/UnrealProjects/TestLinuxCPP/Plugins/ROSIntegration/Source/ROSIntegration/Private/TFBroadcastComponent.cpp:96:38: error: no member named 'GetActorLabel' in 'AActor'
                CurrentThisFrameName = GetOwner()->GetActorLabel();

No idea why this is happening. Could it be related to the issue mentioned previously where CLion can not resolve Engine include file references?