[clang] [clang][diagnostics] suggest extern template syntax for -Wundefined-var-template (PR #187896)

[Shafik Yaghmour via cfe-commits]

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In-Reply-To: <llvm.org/llvm/llvm-project/pull/187896 at github.com>


shafik wrote:

Can you explain "helpful for users migrating from GCC or MSVC, where the explicit instantiation syntax differs" how they differ?

https://github.com/llvm/llvm-project/pull/187896