Unresolve external symbols when using v8.dll in my project

Question

I'm new to making C++ project. I may be not sure prerequisite knowledge of C++ project.

[My environment]

• Windows 10
• Python 2.7.18
• Developer Command Prompt for VS 2022
• Visual Studio 2022 Community

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I'm currently straggling with making V8 engine as a DLL and using it.

I've built V8 engine as a DLL successfly but using it I'm facing "Unresolve exteranl symbols" error.

Details:

error LNK2019: unresolved external symbol "class std::unique_ptr<class v8::Platform,struct std::default_delete<class v8::Platform> > __cdecl v8::platform::NewDefaultPlatform(int,enum v8::platform::IdleTaskSupport,enum v8::platform::InProcessStackDumping,class std::unique_ptr<class v8::TracingController,struct std::default_delete<class v8::TracingController> >)" (?NewDefaultPlatform@platform@v8@@YA?AV?$unique_ptr@VPlatform@v8@@U?$default_delete@VPlatform@v8@@@std@@@std@@HW4IdleTaskSupport@12@W4InProcessStackDumping@12@V?$unique_ptr@VTracingController@v8@@U?$default_delete@VTracingController@v8@@@std@@@4@@Z) referenced in function "public: __cdecl ezv8::Platform::Impl::Impl(void)" (??0Impl@Platform@ezv8@@QEAA@XZ)

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I've researched some thing that C++ mangling and compailer behaviours are.

I've noticed that the v8_libplatform.dll.lib file contains other type of mangled symbols like below.

?NewDefaultPlatform@platform@v8@@YA?AV?$unique_ptr@VPlatform@v8@@U?$default_delete@VPlatform@v8@@@__1@std@@@__1@std@@HW4IdleTaskSupport@12@W4InProcessStackDumping@12@V?$unique_ptr@VTracingController@v8@@U?$default_delete@VTracingController@v8@@@__1@std@@@45@@Z = ?NewDefaultPlatform@platform@v8@@YA?AV?$unique_ptr@VPlatform@v8@@U?$default_delete@VPlatform@v8@@@__1@std@@@__1@std@@HW4IdleTaskSupport@12@W4InProcessStackDumping@12@V?$unique_ptr@VTracingController@v8@@U?$default_delete@VTracingController@v8@@@__1@std@@@45@@Z (class std::__1::unique_ptr<class v8::Platform,struct std::__1::default_delete<class v8::Platform> > __cdecl v8::platform::NewDefaultPlatform(int,enum v8::platform::IdleTaskSupport,enum v8::platform::InProcessStackDumping,class std::__1::unique_ptr<class v8::TracingController,struct std::__1::default_delete<class v8::TracingController> >))

As you can see, the .lib file contains the symbol with __1 namespace.

I found out why the file contains that. A bundled clang compiler compiles std namespace with inline namespace __1 but I'm not sure that how I can change compililng without __1 inline namespace.

Does anyone know how to change the compiler behaviour?

Answer 1

I resolved this problem myself. (But I get still other erros in building.)

What the problem is that I have to add a flag "is_clang = false" to gn args because the clang that is bound v8 will compile other type of manglings to MSVS.

If I added the flag then v8 tools will compile these code with cl.exe you installed.