src/bootstrap/lib.rs

   1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11 //! A small helper library shared between the build system's executables
  12 //!
  13 //! Currently this just has some simple utilities for modifying the dynamic
  14 //! library lookup path.
  15
  16 use std::env;
  17 use std::ffi::OsString;
  18 use std::path::PathBuf;
  19
  20 /// Returns the environment variable which the dynamic library lookup path
  21 /// resides in for this platform.
  22 pub fn dylib_path_var() -> &'static str {
  23     if cfg!(target_os = "windows") {
  24         "PATH"
  25     } else if cfg!(target_os = "macos") {
  26         "DYLD_LIBRARY_PATH"
  27     } else {
  28         "LD_LIBRARY_PATH"
  29     }
  30 }
  31
  32 /// Parses the `dylib_path_var()` environment variable, returning a list of
  33 /// paths that are members of this lookup path.
  34 pub fn dylib_path() -> Vec<PathBuf> {
  35     env::split_paths(&env::var_os(dylib_path_var()).unwrap_or(OsString::new()))
  36         .collect()
  37 }