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Export environment from vcvars64.bat #17

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Commits on Aug 5, 2019

  1. Export environment from vcvars64.bat

    Resolves rust-lang#13.
    
    Some build scripts want to have the compiler and/or linker on the `PATH`
    (such as `blt.mond`). On Windows, this is usually achieved by running a
    Visual Studio `cmd` shell which sets the appropriate environment.
    However, I didn't see a simple way to do this in the `Dockerfile` for
    `powershell` (Windows has no equivalent of `source` in `bash`). Instead,
    we use a variant of a hack described on [Stack
    Overflow](https://stackoverflow.com/a/2124759).
    
    Note the call to `[Environment]::SetEnvironmentVariable`. Simply setting
    variables in `$env:` will not persist beyond a single `RUN` command.
    ecstatic-morse committed Aug 5, 2019
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