ignore test with defaults on macos

Author: jdonszelmann

tests/ui/eii/default/call_default.rs

@@ -3,6 +3,16 @@
 //@ run-pass
 //@ check-run-results
 //@ ignore-backends: gcc
+// Functions can have target-cpu applied. On apple-darwin this is super important,
+// since you can have binaries which mix x86 and aarch64 code that are compatible
+// with both architectures. So we can't just reject target_cpu on EIIs since apple
+// puts them on by default. The problem: we generate aliases. And aliases cannot
+// get target_cpu applied to them. So, instead we should, in the case of functions,
+// generate a shim function. For statics aliases should keep working in theory.
+// In fact, aliases are only necessary for statics. For functions we could just
+//  always generate a shim and a previous version of EII did so but I was sad
+// that that'd never support statics.
+//@ ignore-macos
 // Tests EIIs with default implementations.
 // When there's no explicit declaration, the default should be called from the declaring crate.
 #![feature(extern_item_impls)]