cgen: fix codegen for global array passed as mut (fix #23873) (#23881)

Author: felipensp

vlib/v/gen/c/fn.v

@@ -2639,7 +2639,7 @@ fn (mut g Gen) ref_or_deref_arg(arg ast.CallArg, expected_type ast.Type, lang as
 		&& g.table.unaliased_type(arg_typ).is_pointer() && expected_type.is_pointer()) {
 		if arg.is_mut {
 			if exp_sym.kind == .array {
-				if (arg.expr is ast.Ident && arg.expr.kind == .variable)
+				if (arg.expr is ast.Ident && arg.expr.kind in [.global, .variable])
 					|| arg.expr is ast.SelectorExpr {
 					g.write('&')
 					g.expr(arg.expr)

vlib/v/tests/global_init_array_test.v

@@ -0,0 +1,24 @@
+@[has_globals]
+module main
+
+struct Rectangle {
+	x int
+	y int
+	w int
+	h int
+}
+
+__global bricks = []Rectangle{}
+
+fn init_bricks(mut bricks []Rectangle) {
+	for i in 0 .. 5 {
+		bricks << Rectangle{i, 2 * i, 3 * i, 4 * i}
+	}
+	dump(bricks.len)
+}
+
+fn test_main() {
+	assert bricks.len == 0
+	init_bricks(mut bricks)
+	assert bricks.len == 5
+}