HXCPP_GC_MOVING in combination with HXCPP_ALIGN_ALLOC

[sannyun]

When I run the following program built with HXCPP_GC_MOVING and HXCPP_ALIGN_ALLOC flags enabled, I get a segmentation fault. Commenting out one of them fixes the problem. Moreover , removing these lines solves the problem, too.

System info

• haxe 4.3.6
• hxcpp 4.3.68
• clang 19.1.4
• macOS Sequoia 15.1.1

Main.hx

class Point {
	public function new(x: Int, y: Int) {
		this.x = x;
		this.y = y;
	}
	
	public var x: Int;
	public var y: Int;
}

final ITERATIONS = 10000000;

class Main {
	private static final array: Array<Point> = [];
	
	public static function addPoint(): Void {
		array.push(new Point(array.length, array.length));
	}
	
	public static function main(): Void {
		for (i in 0...ITERATIONS) {
			addPoint();
		}

		final halfSize = Std.int(array.length / 2);
		
		array.resize(halfSize);
		for (i in 0...halfSize) {
			addPoint();
		}

		var idx = Std.int(Math.random() * array.length);
		trace('$idx == ${array[idx].x}');
	}
}

build.hxml

-D HXCPP_GC_MOVING
-D HXCPP_ALIGN_ALLOC
-D HXCPP_API_LEVEL=430

-main Main
--cpp build