Over at mingw.org we just say that use of the product is not supported unless you use the shell provided by mingw.org. If you have a question about why something isn't working and you are using cmd.exe then try sh.exe first before asking for help. We do not test and support other scenarios and your use of other scenarios is at your own support. I see the same being said for cygwin.com but not stated in such a manner.
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