Bug 1512271 - Allow link.exe to keep linking the stylo tests after ru…

…st-lang/rust#54451. r=simonsapin

servo/ports/geckolib/tests/build.rs

@@ -85,6 +85,7 @@ fn main() {
  for line in r.lines() {
  let s = line
  .unwrap()
+ .replace("#[no_mangle]", "")
  .replace("pub extern \"C\" fn", "pub unsafe extern \"C\" fn");
  w.write_all(s.as_bytes()).unwrap();
  w.write_all(b"\n").unwrap();

servo/ports/geckolib/tests/servo_function_signatures.rs

@@ -16,11 +16,15 @@ mod error_reporter;
 #[path = "../../../ports/geckolib/stylesheet_loader.rs"]
 mod stylesheet_loader;
 
-#[allow(non_snake_case, unused_unsafe, private_no_mangle_fns)]
+#[allow(non_snake_case, unused_unsafe)]
 mod glue {
- // this module pretends to be glue.rs, with the safe functions swapped for unsafe ones. This is
- // a hack to compensate for the fact that `fn` types cannot coerce to `unsafe fn` types. The
- // imports are populated with the same things so the type assertion should be equivalent
+ // this module pretends to be glue.rs, with the safe functions swapped for
+ // unsafe ones. This is a hack to compensate for the fact that `fn` types
+ // cannot coerce to `unsafe fn` types. The imports are populated with the
+ // same things so the type assertion should be equivalent.
+ //
+ // We also rely on #[no_mangle] being stripped out so that it can link on
+ // Windows without linking to Gecko, see bug 1512271.
  use geckoservo::*;
  include!(concat!(env!("OUT_DIR"), "/glue.rs"));
 }