doesn't compile in UE 4.24.3 on Linux

[jonbitzen]

Followed the instructions, and had the following compilation error:

[1/8] Compile Module.V8.cpp In file included from /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Intermediate/Build/Linux/B4D820EA/UE4Editor/Development/V8/Module.V8.cpp:8: /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Source/V8/Private/JavascriptContext_Private.cpp:1154:6: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result] ProxyFuncMap->Set(context, I.Keyword("ctor"), Function0); ^~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Source/V8/Private/JavascriptContext_Private.cpp:1155:6: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result] ProxyFuncMap->Set(context, I.Keyword("prector"), Function1); ^~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Source/V8/Private/JavascriptContext_Private.cpp:1161:4: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result] aftr_v8_template->ToObject(context).ToLocalChecked()->Set(context, I.Keyword("proxy"), ProxyFunctions); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Source/V8/Private/JavascriptContext_Private.cpp:1306:4: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result] aftr_v8_template->ToObject(context).ToLocalChecked()->Set(context, I.Keyword("proxy"), ProxyFunctions); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Intermediate/Build/Linux/B4D820EA/UE4Editor/Development/V8/Module.V8.cpp:12: /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Source/V8/Private/JavascriptIsolate_Private.cpp:1189:6: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result] function->Call(isolate->GetCurrentContext(), info.This(), 0, nullptr); ^~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Source/V8/Private/JavascriptIsolate_Private.cpp:1206:6: error: ignoring return value of function declared with 'warn_unused_result' attribute [-Werror,-Wunused-result] function->Call(isolate->GetCurrentContext(), info.This(), 0, nullptr); ^~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 6 errors generated.

I fixed those errors by adding "(void)" in front of the lines identified.

Then I got the following linker error:

Performing 8 actions (16 in parallel) [1/8] Compile Module.V8.cpp [2/8] Link (ld) libUE4Editor-V8.so /home/jrailsback/Documents/Unreal/UnrealEngine/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v15_clang-8.0.1-centos7/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-ld: /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Intermediate/Build/Linux/B4D820EA/UE4Editor/Development/V8/Module.V8.cpp.o: in function FFrame::FFrame(UObject*, UFunction*, void*, FFrame*, UField*)': /home/jrailsback/Documents/Unreal/UnrealEngine/Engine/Source/Runtime/CoreUObject/Public/UObject/Stack.h:217: undefined reference to vtable for FFrame' /home/jrailsback/Documents/Unreal/UnrealEngine/Engine/Extras/ThirdPartyNotUE/SDKs/HostLinux/Linux_x64/v15_clang-8.0.1-centos7/x86_64-unknown-linux-gnu/bin/x86_64-unknown-linux-gnu-ld: /home/jrailsback/Documents/Unreal/unreal-projects/MyProject/Plugins/UnrealJS/Intermediate/Build/Linux/B4D820EA/UE4Editor/Development/V8/Module.V8.cpp.o: in function ~FFrame': /home/jrailsback/Documents/Unreal/UnrealEngine/Engine/Source/Runtime/CoreUObject/Public/UObject/Stack.h:117: undefined reference to vtable for FFrame' clang++: error: linker command failed with exit code 1 (use -v to see invocation)

Any help to get past the linker error would be very much appreciated!

[thejustinwalsh]

https://github.com/ncsoft/Unreal.js-core/issues/53#issuecomment-596613570