libc++ compatible version for Unreal

[narthur157]

Is your feature request related to a problem? Please describe.
Linux servers in Unreal require the library to be compiled against libc++ to be statically linked.
I tried compiling dynamic versions of the library, but didn't have any luck with this when it came to actually packaging the project in Unreal

Describe the solution you'd like
library compiled against libc++

Describe alternatives you've considered
I tried for quite some time to compile this through VS, however I kept getting issues with jsoncpp trying to link against libstd.

Additional context
I solved this by using a modified version of the CMakeList from this PR: #70

project(GSDK_CPP_Linux)

set(CMAKE_CXX_COMPILER "clang++")

set( CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS} -stdlib=libc++")

add_library(GSDK_CPP_Linux
    cpp/cppsdk/gsdk.cpp
    cpp/cppsdk/gsdkConfig.cpp
    cpp/cppsdk/gsdkLog.cpp
    cpp/cppsdk/gsdkUtils.cpp
    cpp/cppsdk/jsoncpp.cpp
    cpp/cppsdk/ManualResetEvent.cpp
)

target_compile_options(GSDK_CPP_Linux PRIVATE -DGSDK_LINUX)
set_target_properties(GSDK_CPP_Linux PROPERTIES CXX_STANDARD 14)
target_include_directories(GSDK_CPP_Linux PRIVATE "cpp/cppsdk")

This is the CMakeLists.txt I used, with Ubuntu on WSL 2 in Windows. I was able to take the resulting .a file and link it in Unreal + deploy to PlayFab.

Note that I'm not sure the CMake version needs to be >= 3.2, so you could try setting this lower.

[narthur157]

I also used the json include fix mentioned in #70

[dgkanatsios]

thanks @narthur157, we'll take a look ASAP!

[haydenstech]

Hi @narthur157 May I ask what your ubuntu setup is like? I'm trying to build the Linux GSDK but the build fails to find list when using libc++, I'm probably missing something silly as I'm not super familiar with Linux, any info would be appreciated! :)

[haydenstech]

Hi @narthur157 May I ask what your ubuntu setup is like? I'm trying to build the Linux GSDK but the build fails to find list when using libc++, I'm probably missing something silly as I'm not super familiar with Linux, any info would be appreciated! :)

Helps to install the right version of clang, I was trying to use clang 9, but moving to clang 10 has resolved the issue

[QHGDerek]

I'd love to see this supported by the GSDK, using Unreal on Linux w/ PlayFab is a significant cost savings.

[narthur157]

I think the most practical thing would be an unreal plugin which just packages all this up in a usable format, and maybe wraps the API with UE style accessors. I have something like the first part of that, but I'm ironing out some issues Tracking down the exact dependencies to install for this to work on WSL 2 would be useful info as well I assume that most people are running Linux servers for unreal except due to incompatibilities I ran this at one point: `sudo apt-get install clang clang-tools-10 libc++-dev libjsoncpp-dev libssl-dev` but I don't believe libjsoncpp should be necessary given it's provided in the project + specified in the CMake. I think a lot of the issue I had with VS was actually that it was specified as a library rather than compiled library, and I wasn't familiar enough with VS build systems to figure it out.

…

On Wed, Apr 28, 2021, 9:31 PM QHGDerek ***@***.***> wrote: I'd love to see this supported by the GSDK, using Unreal on Linux w/ PlayFab is a significant cost savings. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#71 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAPSXABUI2KMQW32FRL6M5LTLCZITANCNFSM43X7PMAA> .

[haydenstech]

I managed to get everything working through WSL2 yesterday with Ubuntu 18.04, With relatively few steps:
From a clean Ubuntu install:

1. apt update
2. apt install clang-9 (I'm on ue4.25 and that's what the cross compiler uses)
3. apt install cmake
4. apt install libc++-dev

I also had to modify the cmake file to explicitly include libcurl release, and to use clang++-9, but other than that I was able to build through VSCode without much pain :)

Definitely agree with @narthur157 that UE plugin would make life much easier for unreal devs!

[narthur157]

https://github.com/narthur157/playfab-gsdk-ue4
Here is the plugin

I'd love for PlayFab to fork this plugin and maintain it / improve it / publish it to the epic marketplace

[QHGDerek]

It'd make sense for them to incorporate this into their existing plugin for UE perhaps?
https://github.com/PlayFab/UnrealMarketplacePlugin

[dgkanatsios]

wow, thanks @narthur157, great work! I'll see how/if we can incorporate this. Can you add a License file as well?

[narthur157]

wow, thanks @narthur157, great work! I'll see how/if we can incorporate this. Can you add a License file as well?

No problem! Yup, done

[dgkanatsios]

@QHGDerek I'd prefer to keep them separate, since in most of the cases you don't need the full PlayFab SDK if you want to use GSDK. I may be 100% wrong here though, feel free to correct me if that's the case!

[QHGDerek]

I tend to disagree here, we actually use the PlayFab SDK on the dedicated server binary, primarily to trigger CloudScript, for instance. It's already got the GSDK in it as well at the moment.

…

On Fri, Apr 30, 2021 at 10:53 AM Dimitris-Ilias Gkanatsios < ***@***.***> wrote: @QHGDerek <https://github.com/QHGDerek> I'd prefer to keep them separate, since in most of the cases you don't need the full PlayFab SDK if you want to use GSDK. I may be 100% wrong here though, feel free to correct me if that's the case! — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#71 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ATI3PHEPISVIL3XHKKP7H4DTLLVDPANCNFSM43X7PMAA> .

[dgkanatsios]

thanks @QHGDerek for the feedback, much appreciated. Additional question would be how hard it is to pull both SDKs (PlayFab SDK and GSDK)? They do have a different publishing path so it might be tricky to maintain them as a single entity.