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use std::io::{self, Write};
#[cfg(windows)]
use std::os::windows::fs as windows;
use std::path::Path;
use std::process;
#[cfg(windows)]
use std::{env, fs};
const MISSING: &str = "
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When building `cxx` from a git clone, git's symlink support needs
to be enabled on platforms that have it off by default (Windows).
Either use:
$ git config --global core.symlinks true
prior to cloning, or else use:
$ git clone -c core.symlinks=true https://github.com/dtolnay/cxx
for the clone.
Symlinks are only required when compiling locally from a clone of
the git repository---they are NOT required when building `cxx` as
a Cargo-managed (possibly transitive) build dependency downloaded
through crates.io.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
";
#[cfg(windows)]
const DENIED: &str = "
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
When building `cxx` from a git clone on Windows we need Developer
Mode enabled for symlink support.
To enable Developer Mode: go under Settings to Update & Security,
then 'For developers', and turn on the toggle for Developer Mode.
For more explanation of symlinks in Windows, see these resources:
> https://blogs.windows.com/windowsdeveloper/2016/12/02/symlinks-windows-10/
> https://docs.microsoft.com/windows/uwp/get-started/enable-your-device-for-development
Symlinks are only required when compiling locally from a clone of
the git repository---they are NOT required when building `cxx` as
a Cargo-managed (possibly transitive) build dependency downloaded
through crates.io.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
";
fn main() {
if Path::new("src/syntax/mod.rs").exists() {
return;
}
#[allow(unused_mut)]
let mut message = MISSING;
#[cfg(windows)]
if let Some(out_dir) = env::var_os("OUT_DIR") {
let parent_dir = Path::new(&out_dir).join("symlink");
let from_dir = parent_dir.join("from");
let to_dir = parent_dir.join("to");
if fs::create_dir_all(&from_dir).is_ok()
&& fs::remove_dir(&to_dir).is_ok()
&& windows::symlink_dir(&from_dir, &to_dir).is_err()
{
message = DENIED;
}
}
let _ = io::stderr().write_all(message.as_bytes());
process::exit(1);
}
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