Auto merge of #100120 - matthiaskrgr:rollup-g6ycykq, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #98771 (Add support for link-flavor rust-lld for iOS, tvOS and watchOS)
 - #98835 (relate `closure_substs.parent_substs()` to parent fn in NLL)
 - #99746 (Use `TraitEngine` in more places that don't specifically need `FulfillmentContext::new_in_snapshot`)
 - #99786 (Recover from C++ style `enum struct`)
 - #99795 (Delay a bug when failed to normalize trait ref during specialization)
 - #100029 (Prevent ICE for `doc_alias` on match arm, statement, expression)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 10 insertions, 7 deletions

diff --git a/compiler/rustc_codegen_ssa/src/back/link.rs b/compiler/rustc_codegen_ssa/src/back/link.rs
index 326dce8011e..63207803e32 100644
--- a/compiler/rustc_codegen_ssa/src/back/link.rs
+++ b/compiler/rustc_codegen_ssa/src/back/link.rs
@@ -2675,7 +2675,7 @@ fn add_apple_sdk(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) {
     let llvm_target = &sess.target.llvm_target;
     if sess.target.vendor != "apple"
         || !matches!(os.as_ref(), "ios" | "tvos" | "watchos")
-        || flavor != LinkerFlavor::Gcc
+        || (flavor != LinkerFlavor::Gcc && flavor != LinkerFlavor::Lld(LldFlavor::Ld64))
     {
         return;
     }
@@ -2706,13 +2706,16 @@ fn add_apple_sdk(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) {
             return;
         }
     };
-    if llvm_target.contains("macabi") {
-        cmd.args(&["-target", llvm_target])
-    } else {
-        let arch_name = llvm_target.split('-').next().expect("LLVM target must have a hyphen");
-        cmd.args(&["-arch", arch_name])
+
+    match flavor {
+        LinkerFlavor::Gcc => {
+            cmd.args(&["-isysroot", &sdk_root, "-Wl,-syslibroot", &sdk_root]);
+        }
+        LinkerFlavor::Lld(LldFlavor::Ld64) => {
+            cmd.args(&["-syslibroot", &sdk_root]);
+        }
+        _ => unreachable!(),
     }
-    cmd.args(&["-isysroot", &sdk_root, "-Wl,-syslibroot", &sdk_root]);
 }
 
 fn get_apple_sdk_root(sdk_name: &str) -> Result<String, String> {