Disable extern_weak test on macOS

Author: bjorn3

build_system/tests.rs

@@ -330,14 +330,6 @@ impl<'a> TestRunner<'a> {
         target_compiler.rustflags.extend(rustflags_from_env("RUSTFLAGS"));
         target_compiler.rustdocflags.extend(rustflags_from_env("RUSTDOCFLAGS"));
 
-        // FIXME fix `#[linkage = "extern_weak"]` without this
-        if target_compiler.triple.contains("darwin") {
-            target_compiler.rustflags.extend([
-                "-Clink-arg=-undefined".to_owned(),
-                "-Clink-arg=dynamic_lookup".to_owned(),
-            ]);
-        }
-
         let jit_supported = use_unstable_features
             && is_native
             && target_compiler.triple.contains("x86_64")

example/mini_core_hello_world.rs

@@ -274,7 +274,7 @@ fn main() {
 
     assert_eq!(((|()| 42u8) as fn(()) -> u8)(()), 42);
 
-    #[cfg(not(any(jit, windows)))]
+    #[cfg(not(any(jit, target_vendor = "apple", windows)))]
     {
         extern "C" {
             #[linkage = "extern_weak"]