iOS lock step keyboard + metal

src/ir/emit_llvm.zig

@@ -267,6 +267,15 @@ pub const LLVMEmitter = struct {
             defer self.alloc.free(name_z);
 
             const llvm_global = c.LLVMAddGlobal(self.llvm_module, llvm_ty, name_z.ptr);
+
+            // Extern globals (`<name> : <type> #foreign;`) resolve at link time
+            // to a libSystem / framework symbol — no initializer, default linkage.
+            if (global.is_extern) {
+                c.LLVMSetLinkage(llvm_global, c.LLVMExternalLinkage);
+                self.global_map.put(@intCast(i), llvm_global) catch {};
+                continue;
+            }
+
             c.LLVMSetLinkage(llvm_global, c.LLVMInternalLinkage);
 
             // Evaluate comptime initializer if present