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    // Copyright 2013-2015 The Rust Project Developers. See the COPYRIGHT
    // file at the top-level directory of this distribution and at
    // http://rust-lang.org/COPYRIGHT.
    //
    // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
    // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
    // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
    // option. This file may not be copied, modified, or distributed
    // except according to those terms.

    //! This module contains the linkage attributes to all runtime dependencies of
    //! the standard library This varies per-platform, but these libraries are
    //! necessary for running libstd.

    // LLVM implements the `frem` instruction as a call to `fmod`, which lives in
    // libm. Hence, we must explicitly link to it.
    //
    // On Linux, librt and libdl are indirect dependencies via std,
    // and binutils 2.22+ won't add them automatically
    #[cfg(all(target_os = "linux", not(target_env = "musl")))]
    #[link(name = "dl")]
    #[link(name = "pthread")]
    extern {}

    #[cfg(target_os = "android")]
    #[link(name = "dl")]
    #[link(name = "log")]
    extern {}

    #[cfg(target_os = "freebsd")]
    #[link(name = "execinfo")]
    #[link(name = "pthread")]
    extern {}

    #[cfg(any(target_os = "dragonfly",
              target_os = "bitrig",
              target_os = "netbsd",
              target_os = "openbsd"))]
    #[link(name = "pthread")]
    extern {}

    // For PNaCl targets, nacl_io is a Pepper wrapper for some IO functions
    // missing (ie always error) in Newlib.
    #[cfg(all(target_os = "nacl", not(test)))]
    #[link(name = "nacl_io", kind = "static")]
    #[link(name = "c++", kind = "static")] // for `nacl_io` and EH.
    #[link(name = "pthread", kind = "static")]
    extern {}

    #[cfg(target_os = "macos")]
    #[link(name = "System")]
    extern {}

    #[cfg(target_os = "ios")]
    #[link(name = "System")]
    extern {}

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