Error during cmake --build . --target install ("JUCE requires c++17 or later")

[lucreciaef]

Hi! Long story short, I have an assignment in which we were asked to export a project from Projuicer to Visual Studio. I would like to use Clion instead, but that requires that I convert the .jucer file to .cmake

I'm using Windows10, so I installed WSL Ubuntu, got the whole thing running (after 3 hours of trial and error)
I installed all the dependencies I could, but when running
$ cmake --build . --target install
the console says "Building CXX object Jucer2Make......" and then after 5 lines it breaks saying
"91 | #error "JUCE requires C++17 or later"

I have the latest version of g++ and clang installed on the ubuntu vm. I installed g++-multilib too.

Do I need to add something additional to the build/target command ? I am learning C++ and I'm quite new to linux, so I apologize if this is a complete noob question. I've exhausted my options.

In the meantime I can continue working on Visual Studio but it's inconvenient once I'm already used to my Clion IDE :(

Thanks in advance to anyone who could give me a hint

[McMartin]

Hi @lucreciaef,

On Windows, you can use CLion with the MSVC toolchain that comes with Visual Studio. See https://www.jetbrains.com/help/clion/quick-tutorial-on-configuring-clion-on-windows.html#MSVC. You don't have to use WSL.

However, if you still want to use WSL, FRUT should work just fine. Could you please share the CMakeCache.txt file in a new comment? I'd like to see how FRUT was configured.

[cuanyu]

I am having the same problem on my Ubuntu 20.04 machine too when I try build and install FRUT.

/home/tom/JUCE/modules/juce_core/system/juce_CompilerSupport.h:91:3: error: "JUCE requires C++17 or later"
#error "JUCE requires C++17 or later"

The JUCE itself could be correctly built stand alone. I am using gcc 9.4.0 and clang 10.0.0-4ubuntu1.

[lucreciaef]

Hi @McMartin
Thank you very much for the quick reply.

I was fortunately able to make this work today! So I'll share what happened here for the record:
I initially tried with Ubuntu so that I could follow the exact installation instructions in the FRUT readme, which are linux commands. It doesn't work otherwise (or I'm not aware of how to do it). So, I wasn't able to create the CMakeLists.txt file myself - a colleague with a Linux machine generated it for me, and I pasted it into my project file and changed the folder paths.

I opened the project on CLion and got an error saying that it couldn't find the "reprojucer" file and that "C++17" was required. I went ahead and simply edited the CMakeLists.txt file... replaced C++14 with C++17 on " CXX_LANGUAGE_STANDARD "C++17"", and corrected the reprojucer.cmake location path, which was somehow wrong - CMake build worked. (?)
Then, when trying to run the project .exe I ran into another problem: fatal error C1128: number of sections exceeded object file format limit: compile with /bigobj ...After reading many threads about what this is and what it means, I found a fix and added

if (MSVC)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /bigobj")
endif()

in the CMakeLists.txt file ... And that finally worked and launched the program.

I removed these manual hacky fixes and changed the toolchain to Visual Studio (instead of MinGW-64) and I run into the same errors. So I put back those additions in the CMakeLists.txt file.

---

To sum up: I'm no longer blocked but I'd still like to see what went wrong with the Ubuntu vm. I'm sending the CMakeCache.txt from the /FRUIT/build folder.

CMakeCache.txt

[McMartin]

I see what is going on: JUCE requires C++17 since juce-framework/JUCE@b3a4d54, which was released in JUCE 7.0.3.
FRUT hasn't been updated yet to support JUCE 7.0.3. I'll take care of fixing that as soon as possible.

[McMartin]

I opened #750 to fix this issue. Feel free to give it a try and let me know if anything is not working as expected.

[lucreciaef]

@McMartin I just tried again. Sadly it failed at 31%. Screenshot below:

I do have the package libx11-dev installed in its latest version. CMakeCache file below!
CMakeCache.txt

[McMartin]

@lucreciaef as documented in https://github.com/juce-framework/JUCE/blob/master/docs/Linux%20Dependencies.md, you also need the package libxrandr-dev (and a few other ones).

[lucreciaef]

@McMartin Thanks for the hint. I thought I had them all but two were missing.
The build and install worked now. I got stuck with $ cmake .. -G<generator> but my guess is that I'm simply missing many other dependencies on this wsl ("Cmake was unable find ...."). So I'll get to reading more about this later :)