[llvm-dev] Which compiler collection on Windows?

[Paul C. Anagnostopoulos via llvm-dev]

Now that I can build LLVM on Windows, I tried doing it. 

--------------------------
... some good stuff ...
C:/LLVM/llvm-project/llvm/lib/Support/Chrono.cpp:35:17: error: '::localtime_s' has not been declared; did you mean 'localtime'?
   35 |   int Error = ::localtime_s(&Storage, &OurTime);
      |                 ^~~~~~~~~~~
      |                 localtime

(The error line is preceded by #if defined(_WIN32).)
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A little research shows that localtime_s is a Microsoft extension and is not included with MinGW. From this I cleverly infer that I should have installed a different compiler collection. Can anyone give me a hint?