Linker error when packaging when the Cesium and Pixel Streaming plugins are both enabled

[alingkumo]

Hello everyone, When i use both Pixelstreaming and CesiumForUnreal, when I packing the project,the problem happened!!
I found a similar problem in CesiumGS/cesium-native@cd67f6f, should the native update or ?

webrtc.lib(numbers.obj) : error LNK2005: "char * __cdecl absl::numbers_internal::FastIntToBuffer(unsigned int,char *)" (?FastIntToBuffer@numbers_internal@absl@@YAPEADIPEAD@Z) already defined in s2geometry.lib(numbers.obj)
UATHelper: Packaging (Windows): webrtc.lib(numbers.obj) : error LNK2005: "char * __cdecl absl::numbers_internal::FastIntToBuffer(int,char *)" (?FastIntToBuffer@numbers_internal@absl@@YAPEADHPEAD@Z) already defined in s2geometry.lib(numbers.obj)
UATHelper: Packaging (Windows): webrtc.lib(numbers.obj) : error LNK2005: "char * __cdecl absl::numbers_internal::FastIntToBuffer(unsigned __int64,char *)" (?FastIntToBuffer@numbers_internal@absl@@YAPEAD_KPEAD@Z) already defined in s2geometry.lib(numbers.obj)
UATHelper: Packaging (Windows): webrtc.lib(numbers.obj) : error LNK2005: "char * __cdecl absl::numbers_internal::FastIntToBuffer(__int64,char *)" (?FastIntToBuffer@numbers_internal@absl@@YAPEAD_JPEAD@Z) already defined in s2geometry.lib(numbers.obj)
UATHelper: Packaging (Windows): webrtc.lib(numbers.obj) : error LNK2005: "unsigned __int64 __cdecl absl::numbers_internal::SixDigitsToBuffer(double,char *)" (?SixDigitsToBuffer@numbers_internal@absl@@YA_KNPEAD@Z) already defined in s2geometry.lib(numbers.obj)
UATHelper: Packaging (Windows): Creating library D:\Code\ESDemoCPP\Binaries\Win64\ESDemoCPP-Win64-Shipping.lib and object D:\Code\ESDemoCPP\Binaries\Win64\ESDemoCPP-Win64-Shipping.exp
UATHelper: Packaging (Windows): D:\Code\ESDemoCPP\Binaries\Win64\ESDemoCPP-Win64-Shipping.exe : fatal error LNK1169: one or more multiply defined symbols found

[alingkumo]

PixelStreaming use WebRTC, then WebRTC use link to webtrc.lib

[kring]

Looks like both WebRTC and S2Geometry link parts of Abseil into themselves statically. This is going to be very tricky to solve.

[Immersiv-1]

Hi @alingkumo, did you find a workaround for this issue? Thanks

[alingkumo]

@Immersiv-1 I just change the absl namespace to others, and recompile s2geometry in the cesium native, that can work but not the best solution.

[kring]

Yeah that's a good idea @alingkumo. We'll probably have to do something similar to fix it in the shipped version of Cesium for Unreal.