[libcxx-commits] [libcxx] [libc++] Introduce a new attribute keyword for Clang improves compatibility with Mingw-GCC (PR #141040)

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jeremyd2019 wrote:

> In MinGW environment, Clang handles dllexport attribute of internal class that defined in class template in different way from GCC. This incompatibility should be fixed but breaks ABI of libc++, so we need to introduce the new keyword to keep ABI in MinGW environment with old and patched Clang and to stay ABI compatible on other platforms.

I believe we established that dllexport and dllimport are handled the same between Clang and GCC, and it is the more mundane `extern` that is handled differently.

https://github.com/llvm/llvm-project/pull/141040