rust-lang/rust — pull request #15280 by aturon (2014-06-30 18:34:28+00:00)
Title: std::os - Add join_paths, make setenv non-utf8 capable

This commit changes `os` in two ways:

* It adds a `join_paths` function that is the converse to `split_paths`,
easing manipulation of the `PATH` environment variable according to
platform conventions.

* It changes `setenv` to take a `BytesContainer` rather than a `&str`
value, since environment variables may have non-utf8 values on some
platforms. Since `&str` is a `BytesContainer`, this is *not* a
breaking change.

Along the way, it also refactors the `split_paths` function so that
`cfg` switches are applied internally (and the function header is given
only once). This fixes a bug: the doc comment had an example for only
one platform.