How to make clangd use C++20 standard in my vim?

Clang Frontend clangd
#1

I just want to write Modern C++ in my vim using CoC without warnings and errors because of using C++20 features.

How to make coc-clangd use c++20 in neovim?
#2

Your compilation database (compile_commands.json or compile_flags.txt) should specify -std=c++20. You’ll also need clangd 10, as clang 10 is the first version that supports most of C++20. (Not all: see https://clang.llvm.org/cxx_status.html)

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