Mingw-w64 File Layout

I installed the multilib version of mingw-w64 so I could build both 32-bit and 64-bit binaries. Here's a tree representation of the files: http://pastebin.com/r4QUnbwJ. If you only want to view the directories, see this instead: http://pastebin.com/2m6uqt4E. It looks like there are duplicate files in some cases, like in the bin directory. Are they different in any way? Also, I see one directory named "mingw" and another named "x86_64-w64-mingw32". They look about the sa开发者_StackOverflow社区me in content. Again, what is the difference?

Basically, I just want an explanation of the file layout. I'm not expecting a description of each file, but it would be good if some of the main concepts within mingw-w64 (multilib) were addressed.

In my experience, the /mingw directory can safely be deleted. It is only needed for the strange GCC build system (and can even be empty in some cases).

The x86_64-w64-mingw32/bin directory contains executables called by gcc/g++/gfortran/etc. internally. Don't delete them.

There doesn't seem to be a "standard" directory structure, sometimes the x86_64-w64-mingw32/lib(32) and x86_64-w64-mingw32/include directories contain the same files. Sometimes the same files are even in the root include and lib(32) directories. If you need an expert's answer, feel free to post to the minwgw-64 mailing list, a lot of knowledgeable people reside there.