Jobserber windows #37
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External subcommands are already able to inherit the jobserver from env since rust-lang#10511. However, users reported that they've expected `cargo run` to behave the same as external subcommands. A popular example "cargo-xtask" pattern is used as scripting to run arbitrary tasks. Users may want to invoke `cargo run` from Make and expect some parallelism. This PR provides such an ability to the general `target.<...>.runner`, which affects `cargo test`, `cargo bench`, and `cargo run`. Note that this PR doesn't create any jobserver client if there is no existing jobserver from the environment. Nor `-j`/`--jobs` would create a new client. Reasons for this decision: * There might be crates don't want the jobserver to pollute their file descriptors, although they might be rare * Creating a jobsever driver with the new FIFO named pipe style is not yet supported as of `jobserver@0.1.26`. Once we can create a named pipe-based jobserver, it will be less risky and inheritance by default can be implemented.
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