How to build v8 to work with this project?

[Zeblote]

How are you creating the v8 binaries? I tried pretty much every combination of common settings in the args.gn file:

But there are 2 problems:

• you have 4 v8_base_x.lib files for some reason, I only get a single v8_base.lib
• attempting to replace your libs with the new ones results in a large number of errors like v8_base.lib(api.obj) : error LNK2038: mismatch detected for 'RuntimeLibrary': value 'MT_StaticRelease' doesn't match value 'MD_DynamicRelease' in SharedPCH.UnrealEd.h.obj when building the plugin.

[crocuis]

Have you read this? Https://github.com/ncsoft/Unreal.js/wiki/V8 :)

[Zeblote]

Oh! That's for building with gyp though, v8 wants to build with this new gn thing now... I'll see if it has similar options

[Zeblote]

I tried using similar gn settings, but it's not successful so far. The setting v8_enable_inspector doesn't actually exist in gyp or gn.

is_debug = false
target_cpu = "x64"
v8_use_snapshot = false
v8_static_library = true
is_component_build = true
v8_enable_i18n_support = false
treat_warnings_as_errors = false

The lib is huge now! v8_base.lib is over 800MB... can't be right. Still causes hundreds of errors also:

[Zeblote]

Next try:

is_debug = false
target_cpu = "x64"
v8_use_snapshot = false
v8_static_library = true
is_component_build = false
v8_enable_i18n_support = false
treat_warnings_as_errors = false

I also to v8/build/config/win/BUILD.gn and changed configs = [ ":static_crt" ] to configs = [ ":dynamic_crt" ] since the force_dynamic_crt setting doesn't exist anymore in gn.

The v8_base.lib is back to normal size now... 350MB It also generated significantly less errors: ... but it still isn't working.

[crocuis]

Is this the same problem? Https://bugs.chromium.org/p/v8/issues/detail?id=6461

[Zeblote]

I don't think it is, building v8 works fine. The problem only appears when trying to link it in your plugin.

[crocuis]

I did not have a problem with gyp build. I will reply after I try to build with gn.

[crocuis]

I think the version of v8 you built seems to be higher than 6.0. Version 6.0 or later requires additional v8_builtins_setup.lib and v8_builtins_generators.lib.

[Zeblote]

Oh. I've added these 2 libs for 6.0, but it's still not linking properly. Now the number of errors is down to 2 though:

2>Module.V8.cpp.obj : error LNK2019: unresolved external symbol "public: static class std::unique_ptr<class v8_inspector::V8Inspector,struct std::default_delete<class v8_inspector::V8Inspector> > __cdecl v8_inspector::V8Inspector::create(class v8::Isolate *,class v8_inspector::V8InspectorClient *)" (?create@V8Inspector@v8_inspector@@SA?AV?$unique_ptr@VV8Inspector@v8_inspector@@U?$default_delete@VV8Inspector@v8_inspector@@@std@@@std@@PEAVIsolate@v8@@PEAVV8InspectorClient@2@@Z) referenced in function "public: __cdecl FInspector::FInspector(class v8::Platform *,int,class v8::Local<class v8::Context>)" (??0FInspector@@QEAA@PEAVPlatform@v8@@HV?$Local@VContext@v8@@@2@@Z)
2>v8_libbase.lib(stack_trace_win.obj) : error LNK2019: unresolved external symbol __imp_PathRemoveFileSpecW referenced in function "bool __cdecl v8::base::debug::`anonymous namespace'::InitializeSymbols(void)" (?InitializeSymbols@?A0x76313174@debug@base@v8@@YA_NXZ)

How does your args.gn file look? Or did you change something else to make it work?

[crocuis]

No. I found out that I was experiencing the same thing as your error when building v8 version 6.1 with GYP instead of GN. Assuming your error message, I think v8_enable_inspector is missing.

[Zeblote]

I searched the entire v8 folder for enable_inspector and the setting doesn't exist. Maybe it has been renamed.

[crocuis]

There was no problem in building with GYP. If it is a GN build only problem, it is assumed that config is different.

[Zeblote]

Ok, it seems to work if I also copy over v8/out.gn/x64.release/obj/src/inspector/inspector.lib and add PublicAdditionalLibraries.Add("shlwapi.lib"); to V8.Build.cs.

Is there any advantage to building with GN then? I only wanted to use that because the v8 wiki says GYP is supposed to be deprecated and removed soon.

[crocuis]

When I built V8, I did not know about building V8 with GN. If building V8 with GN works well, please update to GN build at https://github.com/ncsoft/Unreal.js/wiki/V8.

[tank90fc]

I build v8(Version 6.2) with gn. UnrealEngine crashes when loading "UnrealJS plugin"

[crocuis]

Since version v8 (Version 6.2) is not officially released, there may be several internal problems. If the V8 API has changed or if it is necessary to implement it, I will add it later.

[hamkoo]

I build v8(Version 6.2) with gn. UnrealEngine crashes when loading "UnrealJS plugin"

@crocuis I have the same error. Now, have you resolved it?