CMake error when opening the project in CLion in Ubuntu 16.04

[YashBansod]

I installed the Unreal Editor 4.18.3 on my Ubuntu 16.04 machine.
I did all the steps mentioned in the setup:

1. Selected CLion in : Editor Preferences => General => Source Code Editor => CLion
2. Have this set up at Project Settings => Plugins => CLion
   
3. File => GenerateCMakeList (This was succesfull)
4. File => Open CLion (CLion Opens)

But then I get the following error:

Does anyone know how to resolve this issue.

The same error in text for convenience:

/home/uidk4283/tools/clion-2017.3.3/bin/cmake/bin/cmake -DCMAKE_BUILD_TYPE=Debug -G "CodeBlocks - Unix Makefiles" "/home/uidk4283/Documents/Unreal Projects/FirstProject"
-- Configuring done
-- Generating done
-- Build files have been written to: /home/uidk4283/Documents/Unreal Projects/FirstProject/cmake-build-debug

Cannot get compiler information:
Compiler exited with error code 1: /usr/bin/clang++ -xc++ -DACTORPICKERMODE_API= ........
Candidate multilib: .;@m64
Candidate multilib: 32;@m32
Candidate multilib: x32;@MX32
Selected multilib: .;@m64
Found CUDA installation: /usr/local/cuda, version unknown
clang: error: no such file or directory: '('
clang: error: no such file or directory: '1.39'
clang: error: no such file or directory: ')'
clang: error: no such file or directory: '('
clang: error: no such file or directory: 'Steamv139'
clang: error: no such file or directory: ')'

[YashBansod]

@reapazor Can you please help me with this issue or with #97. I am really stuck and basically CLion is proving to be useless for development with UE4

[RicardoEPRodrigues]

It seems a CLion related problem. Try to check what compiler the IDE is using and if C++ compilers.

[reapazor]

I'm with @RicardoEPRodrigues on this one, looking at that suggests that you have multiple compilers installed and CLion is getting confused as to what one to use.

The plugin "used too" have an option where we would specify the compiler, but I removed that in the released version because its not necessary, this makes me wonder if i should put it back in for Linux.

[S-Marais]

In the CMakeLists.txt there are two definitions that won't work as it is.
-DSTEAM_SDK_VER=TEXT("1.39") -DSTEAM_SDK_VER_PATH=TEXT("Steamv139")
Just removing TEXT(" and ") fixes the issue

[reapazor]

What version of the plugin is this on? Ue4 built in?

…

-- Matthew Davey dotBunny

________________________________ From: S-Marais <notifications@github.com> Sent: Wednesday, March 28, 2018 6:39:15 PM To: dotBunny/CLionSourceCodeAccess Cc: Matthew Davey; Mention Subject: Re: [dotBunny/CLionSourceCodeAccess] CMake error when opening the project in CLion in Ubuntu 16.04 (#95) In the CMakeLists.txt there are two definitions that won't work as it is. -DSTEAM_SDK_VER=TEXT("1.39") -DSTEAM_SDK_VER_PATH=TEXT("Steamv139") Just removing TEXT(" and ") fixes the issue — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#95 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AAGD3Afgvyoj59QfrmZYLIdrAD8lJh8gks5tjBETgaJpZM4SbZoY>.

[S-Marais]

both actually, but it feels more like a UE4 doing than the plugin itself.
The error is the same on 1.07 and 2.0

I did check cmake-definitions.cmake in 4.19 Engine/Intermediate/ProjectFiles/ and the definition for STEAM_SDK_VER and STEAN_SDK_VER_PATH both have TEXT("###")

the error is on UE4 side

[S-Marais]

So as an update on this one. I did a fresh install of UE 4.18.3. Changed the Setup.sh to match my OS configuration (I use Linux Mint 18.3 with llvm-5.0).

After compiling the engine I created a basic fresh c++ project and launched it once. closed it and installed the plugin version 1.07. It compiled and I launched the project once more, did all configuration then I "Refresh the Clion Project", then "Generate the CMakeLists.txt" and then launched CLion from the Editor and everything went fine with no error from clang.

I will try to see if I can reproduce this on 4.19 with plugin version 2.0 but since there is no extra menu for Clion in the File drop down menu I doubt I can make it work the same.

[S-Marais]

I finally found the problem in UE 4.19 and it's nothing to do with CLion 2.0. The problem is in the CMakefileGenerator.cs in UE4. Preprocessors from Intellisense are the ones used to create the cmake definitions and the steam sdks' ones come with TEXT(""). Editing the CMakefileGenerator.cs line 389 like the following solves the issue:
string Definition = PreProcessorDefinition.Replace("TEXT(\"", "").Replace("\")", "");
You can find the same line in UE 4.18 at line 191. Replacing it with the one above should solve the issue.

In addition since CLion is not set by default to use clang, line 344 you may add the two following lines:
"set(CMAKE_C_COMPILER /usr/bin/clang)" +
"set(CMAKE_CXX_COMPILER /usr/bin/clang++)" +
Since these two parameters are already set in 4.18 by CMakefileGenerator.cs you should be fine.

[jeanmarc]

string Definition = PreProcessorDefinition.Replace("TEXT("", "").Replace("")", "");

This may fix the current issue, but will break any setting that has an actual ')' in its value.

I don't know C#, but this stripping of the 'TEXT(' and ')' and leaving the actual string constant should be done in a more robust way. Pseudocode:

if [ string contains '=TEXT(' and trimmed string ends with ')' ] then replace '=TEXT(' with '=' and remove the last character).

Another question: how can we get this proposed change to UE4 into their codebase?
(I am an UE4 noob as well, and have no idea what the common processes are).

[jeanmarc]

"set(CMAKE_C_COMPILER /usr/bin/clang)" +
"set(CMAKE_CXX_COMPILER /usr/bin/clang++)" +

Are missing the \n at the end, resulting in an error when opening the project in CLion after running GenerateProjectFiles.sh on the Unreal Engine (4.19.1, on Debian Stretch):

CMake Error at CMakeLists.txt:12: Parse error. Expected a newline, got identifier with text "set".

CMakeLists.txt line 9 to 12:

set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_OBJECTS 1 CACHE BOOL "" FORCE) set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES 1 CACHE BOOL "" FORCE)

set(CMAKE_C_COMPILER /usr/bin/clang)set(CMAKE_CXX_COMPILER /usr/bin/clang++)# Standard Includes

[S-Marais]

@jeanmarc I'm only modifying preprocessor definitions here by replacing the TEXT("") only in definitions TEXT() is actually a UE macro.

I have pulled a request in UE4 that changes the way set(CMAKE_CXX_COMPILER) is set and it's not hard coded. First it checks if we are on linux then it uses a function from LinuxCommon.cs to find clang if it can't find clang it looks for gcc

in the mean time there set should be written like the following:
"set(CMAKE_C_COMPILER /usr/bin/clang)\n" +
"set(CMAKE_C_COMPILER /usr/bin/clang++)\n\n" +

Note the \n at the end that will create new lines. And make sure the of the path of your clang. you can try to find the correct path by typing the following command in a terminal:
type clang++ or type clang++-3.8 and use the path that is returned instead

[reapazor]

Heres the thing about those lines inside of the config, those were there originally but we removed them as CLion manages the clang install. It seems like it might be more a problem with CLion on Linux then it is on mac/win. I’ll poke some people about that.

…

-- Matthew Davey dotBunny From: S-Marais <notifications@github.com> Reply-To: dotBunny/CLionSourceCodeAccess <reply@reply.github.com> Date: Monday, April 2, 2018 at 04:48 To: dotBunny/CLionSourceCodeAccess <CLionSourceCodeAccess@noreply.github.com> Cc: Matthew Davey <matthew.davey@dotbunny.com>, Mention <mention@noreply.github.com> Subject: Re: [dotBunny/CLionSourceCodeAccess] CMake error when opening the project in CLion in Ubuntu 16.04 (#95) @jeanmarc<https://github.com/jeanmarc> I'm only modifying preprocessor definitions here by replacing the TEXT("") only in definitions TEXT() is actually a UE macro. I have pulled a request in UE4 that changes the way set(CMAKE_CXX_COMPILER) is set and it's not hard coded. First it checks if we are on linux then it uses a function from LinuxCommon.cs to find clang if it can't find clang it looks for gcc in the mean time there set should be written like the following: "set(CMAKE_C_COMPILER /usr/bin/clang)\n" + "set(CMAKE_C_COMPILER /usr/bin/clang++)\n\n" + Note the \n at the end that will create new lines. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#95 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AAGD3AhrU16tBr9Sx7xqtArF7T2DsTQsks5tkeXSgaJpZM4SbZoY>.

[S-Marais]

@reapazor check my pull request 4619 on the UE release. This should solve the compiler issue on Linux without affecting the other platforms, and the definitions issue when working with CMake.