windows-gen build script loops forever if OUT_DIR does not have a Cargo.toml in its tree

[monax3]

If you set the Cargo target-dir to somewhere other than a sub directory of the project this snippet will never complete:

windows-rs/crates/gen/build.rs

Lines 9 to 26 in 7347944

	let mut destination: ::std::path::PathBuf = ::std::env::var("OUT_DIR")
	.expect("No `OUT_DIR` env var")
	.into();
	loop {
	destination.pop();
	destination.push("Cargo.toml");
	if destination.exists() {
	destination.pop();
	destination.push("target");
	destination.push(".windows");
	destination.push("winmd");
	break;
	}
	destination.pop();
	}

Presumably other stuff would fail too since the expected directory structure isn't there.

[kennykerr]

I'm working on this. The trouble is that there's no reliable way to find the target directory.

rust-lang/docs.rs#1444 (comment)

rust-lang/cargo#9661

This didn't work: #951

[kennykerr]

This should be fixed as of 0.17.0