missing libgcc_s_dw2-1.dll message after install in win7 (rust-4)

[wirepair]

Saw this: https://mail.mozilla.org/pipermail/rust-dev/2012-October/002397.html
downloaded exe, ran install in windows 7 (running 64 bit) opened my default command prompt, ran 'rustc' got "The program can't start because libgcc_s_dw2-1.dll is missing from your computer.

[Blei]

Quote from https://mail.mozilla.org/pipermail/rust-dev/2012-October/002400.html:

On 10/03/2012 06:16 PM, Adam wrote:
> I'm on Windows 8 64-bit RTM as well, however when I run rustc I get a
> prompted that "libgcc_s_dw2-1.dll is missing from your computer".

This sounds like a symptom of not running from the MinGW shell (an 
unfortunate limitation in our Windows build). There are some 
instructions for getting MinGW setup on the wiki.

* https://github.com/mozilla/rust/issues/1603
* https://github.com/mozilla/rust/wiki/Note-getting-started-developing-Rust

[adamjgray]

So it won't work with MinGW64 either will it?

[graydon]

No, we only support 32-bit windows targets at the moment. This is not a long-term limitation, just a matter of ports we've done vs. not-yet-done; 64bit works on linux and osx presently.

[graydon]

Also this is pretty much just a dupe of #2871 (we've had lots of people hit it). It's not going to be solved this release, sadly. Closing as duplicate.

[abhididdigi]

All you have to do is copy that particular .dll from the bin folder of MinGW. I'm on windows 64 bit and it works just fine.