Rollup merge of #80215 - visigoth:issue-80202-fix, r=estebank

Use -target when linking binaries for Mac Catalyst

When running `rustc` with `-target x86_64-apple-ios-macabi`, the linker
eventually gets run with `-arch x86_64`, because the linker back end splits the
LLVM target triple and uses the first token as the target architecture. However,
this does not work for the Mac Catalyst ABI, which is a separate target from
Darwin.

Specifying the full target triple with `-target` allows Mac Catalyst binaries to
link and run.

closes #80202

Author: Dylan-DPC

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -2211,8 +2211,13 @@ fn add_apple_sdk(cmd: &mut dyn Linker, sess: &Session, flavor: LinkerFlavor) {
             return;
         }
     };
-    let arch_name = llvm_target.split('-').next().expect("LLVM target must have a hyphen");
-    cmd.args(&["-arch", arch_name, "-isysroot", &sdk_root, "-Wl,-syslibroot", &sdk_root]);
+    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])
+    }
+    cmd.args(&["-isysroot", &sdk_root, "-Wl,-syslibroot", &sdk_root]);
 }
 
 fn get_apple_sdk_root(sdk_name: &str) -> Result<String, String> {