Fix the build by avoiding by-value struct arguments

Author: maxbrunsfeld

src/lib.c

@@ -5,10 +5,10 @@ typedef struct {
   uint32_t column;
 } Point;
 
-Point add_points_in_c(Point a, Point b) {
-  if (b.line > 0) {
-    return (Point) {a.line + b.line, b.column};
+Point add_points_in_c(const Point *a, const Point *b) {
+  if (b->line > 0) {
+    return (Point) {a->line + b->line, b->column};
   } else {
-    return (Point) {a.line, a.column + b.column};
+    return (Point) {a->line, a->column + b->column};
   }
 }

src/lib.rs

@@ -8,12 +8,12 @@ pub struct Point {
 }
 
 extern "C" {
-    fn add_points_in_c(a: Point, b: Point) -> Point;
+    fn add_points_in_c(a: *const Point, b: *const Point) -> Point;
 }
 
 #[wasm_bindgen]
 pub fn add_points_in_rust(a: Point, b: Point) -> Point {
-    unsafe { add_points_in_c(a, b) }
+    unsafe { add_points_in_c(&a as *const Point, &b as *const Point) }
 }
 
 #[wasm_bindgen]