"ssl network error" thrown during non-blocking sys.ssl.Socket handshake when compiled with -debug and -D HXCPP_M64 on Windows

1

Code to reproduce:

import haxe.Timer;
import haxe.io.Error;

class Main {
	static function main() {
		var socket = new sys.ssl.Socket();
		try {
			socket.setBlocking(false);
			socket.connect(new sys.net.Host("haxe.org"), 443);
		}
		catch (e:Dynamic) {}
		function tryHandshake():Void {
			var result = sys.net.Socket.select(null, [socket], null, 0);
			if (result.write[0] != socket) {
				Timer.delay(tryHandshake, 16);
				return;
			}
			try {
				socket.handshake();
			}
			catch (e:Error)
			{
				switch (e)
				{
					case Error.Blocked:
						Timer.delay(tryHandshake, 16);
					case Error.Custom(Error.Blocked):
						Timer.delay(tryHandshake, 16);
					default:
						trace("handshake failed 1: " + e);
				}
				return;
			}
			catch (e:Dynamic)
			{
				trace("handshake failed 2: " + e);
				return;
			}
			trace("handshake succeeded");
		}
		Timer.delay(tryHandshake, 16);
	}
}

Build command:

haxe -cp src -main Main -debug -cpp out -D HXCPP_M64

If you remove one of -debug or -D HXCPP_M64 (or both), the handshake completes successfully. If the socket is blocking, the handshake completes successfully.

I confirmed that it works correctly with all combinations on macOS.

Haxe 4.2.5
hxcpp 4.2.1
Windows 11 Pro 22H2 (a colleague also reproduces on Windows 10)

For reference, I also reported this as issue hxcpp#1033, but I wanted to cross-post here for wider visibility.