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README: Add instructions for building on windows. #15210

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Expand Up @@ -58,6 +58,23 @@ documentation.
3. Read the [tutorial].
4. Enjoy!

### Building on Windows

To easily build on windows we can use [MSYS2](http://sourceforge.net/projects/msys2/):

1. Grab the latest MSYS2 installer and go through the installer.
2. Now from the MSYS2 terminal we want to install the mingw64 toolchain and the other
tools we need.

$ pacman -S mingw-w64-i686-toolchain
$ pacman -S base-devel

3. With that now start `mingw32_shell.bat` from where you installed MSYS2 (i.e. `C:\msys`).
4. From there just navigate to where you have Rust's source code, configure and build it:

$ ./configure --build=i686-pc-mingw32
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Is the --build option required?

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Oh, i guess that's only needed on 64 bit windows.

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Yep, it is currently required on 64-bit windows since uname -a always returns x86_64. Without the flag, configure recognizes CFG_BUILD := x86_64-pc-mingw32 on mingw32_shell.bat.

$ make && make install

[repo]: https://github.com/rust-lang/rust
[tarball]: http://static.rust-lang.org/dist/rust-nightly.tar.gz
[tutorial]: http://doc.rust-lang.org/tutorial.html
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