1 use std::io::{self, Write}; 2 #[cfg(windows)] 3 use std::os::windows::fs as windows; 4 use std::path::Path; 5 use std::process; 6 #[cfg(windows)] 7 use std::{env, fs}; 8 9 const MISSING: &str = " 10 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 11 When building `cxx` from a git clone, git's symlink support needs 12 to be enabled on platforms that have it off by default (Windows). 13 Either use: 14 15 $ git config --global core.symlinks true 16 17 prior to cloning, or else use: 18 19 $ git clone -c core.symlinks=true https://github.com/dtolnay/cxx 20 21 for the clone. 22 23 Symlinks are only required when compiling locally from a clone of 24 the git repository---they are NOT required when building `cxx` as 25 a Cargo-managed (possibly transitive) build dependency downloaded 26 through crates.io. 27 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 28 "; 29 30 #[cfg(windows)] 31 const DENIED: &str = " 32 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 33 When building `cxx` from a git clone on Windows we need Developer 34 Mode enabled for symlink support. 35 36 To enable Developer Mode: go under Settings to Update & Security, 37 then 'For developers', and turn on the toggle for Developer Mode. 38 39 For more explanation of symlinks in Windows, see these resources: 40 > https://blogs.windows.com/windowsdeveloper/2016/12/02/symlinks-windows-10/ 41 > https://docs.microsoft.com/windows/uwp/get-started/enable-your-device-for-development 42 43 Symlinks are only required when compiling locally from a clone of 44 the git repository---they are NOT required when building `cxx` as 45 a Cargo-managed (possibly transitive) build dependency downloaded 46 through crates.io. 47 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 48 "; 49 main()50fn main() { 51 if Path::new("src/syntax/mod.rs").exists() { 52 return; 53 } 54 55 #[allow(unused_mut)] 56 let mut message = MISSING; 57 58 #[cfg(windows)] 59 if let Some(out_dir) = env::var_os("OUT_DIR") { 60 let parent_dir = Path::new(&out_dir).join("symlink"); 61 let original_dir = parent_dir.join("original"); 62 let link_dir = parent_dir.join("link"); 63 if fs::create_dir_all(&original_dir).is_ok() 64 && (!link_dir.exists() || fs::remove_dir(&link_dir).is_ok()) 65 && windows::symlink_dir(&original_dir, &link_dir).is_err() 66 { 67 message = DENIED; 68 } 69 } 70 71 let _ = io::stderr().write_all(message.as_bytes()); 72 process::exit(1); 73 } 74