Does Google's V8 require C++14 standard?

I am currently trying to build Google's V8 engine, following its official documents.

And I get some errors here:

1. Need a newer glibc

   python ../../tools/run.py ./bytecode_builtins_list_generator gen/builtins-generated/bytecodes-builtins-list.h
   ./bytecode_builtins_list_generator: /lib64/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by ./bytecode_builtins_list_generator)
   Return code is 1
   [115/1639] CXX obj/torque_base/torque-parser.o
   

2. Some C++14 grammar Such as in include/v8-internal.h, there is a std::remove_cv_t

   template <class T>
   V8_INLINE void PerformCastCheck(T* data) {
     CastCheck<std::is_base_of<Data, T>::value &&
               !std::is_same<Data, std::remove_cv_t<T>>::value>::Perform(data);
   }
   

When looking into its building procedure, I find it actually uses third_party/llvm-build/Release+Asserts/bin/clang++ with a -std=c++14 flag.

So I am wondering if I can build a V8 engine with some old gcc, like gcc 4.4.6/4.8.5?

Yes, V8 currently requires C++14.

Expect future changes to be in the direction of requiring C++17 (though there's no timeline for that yet), rather than going back to older C++ standards.