src/librustc/util/fs.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 use std::path::{self, Path, PathBuf};
  12 use std::ffi::OsString;
  13
  14 // Unfortunately, on windows, gcc cannot accept paths of the form `\\?\C:\...`
  15 // (a verbatim path). This form of path is generally pretty rare, but the
  16 // implementation of `fs::canonicalize` currently generates paths of this form,
  17 // meaning that we're going to be passing quite a few of these down to gcc.
  18 //
  19 // For now we just strip the "verbatim prefix" of `\\?\` from the path. This
  20 // will probably lose information in some cases, but there's not a whole lot
  21 // more we can do with a buggy gcc...
  22 pub fn fix_windows_verbatim_for_gcc(p: &Path) -> PathBuf {
  23     if !cfg!(windows) {
  24         return p.to_path_buf()
  25     }
  26     let mut components = p.components();
  27     let prefix = match components.next() {
  28         Some(path::Component::Prefix(p)) => p,
  29         _ => return p.to_path_buf(),
  30     };
  31     let disk = match prefix.kind() {
  32         path::Prefix::VerbatimDisk(disk) => disk,
  33         _ => return p.to_path_buf(),
  34     };
  35     let mut base = OsString::from(format!("{}:", disk as char));
  36     base.push(components.as_path());
  37     PathBuf::from(base)
  38 }