Hi Kumail
libcxx doesn’t currently compile using mingw for Windows.
I’m about to submit another patch attempting to fix it though.
If it’s accepted, I’ll contact you privately / directly and see if I can help you get it libcxx on mingw working for you. Contact me directly and let me know what your system is.
Mingw-w64 can compile libcxx.
But doesn’t link libcxx to a dll
I think If can build libcxx by Microsoft Visual C++ ,It’s Very good.
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Thank you for this information 
By the way, can you tell me how I can use stdlibc++ with clang++ on windows?
My "Hello World" program always crashes when ever I run it.