diff --git a/rs/toolchains/declare_rustc_toolchains.bzl b/rs/toolchains/declare_rustc_toolchains.bzl
--- a/rs/toolchains/declare_rustc_toolchains.bzl
+++ b/rs/toolchains/declare_rustc_toolchains.bzl
@@ -45,6 +45,14 @@
             },
         )
         source_stdlib_building_select[config_setting] = "@rules_rs//rs/private:empty_stdlib"
+
+    # Apple targets default to packed dSYMs and invoke dsymutil at link time.
+    # The Linux remote Rust action has no dsymutil. Match Cargo release's
+    # split-debuginfo policy so line/full info remains available before packaging.
+    darwin_debug_flags = select({
+        "@platforms//os:macos": ["-Csplit-debuginfo=off"],
+        "//conditions:default": [],
+    })
-
+
     for triple in execs:
         exec_triple = _parse_triple(triple)
@@ -152,8 +160,20 @@
                 "//conditions:default": [],
             }),
             default_edition = edition,
-            extra_exec_rustc_flags = _rustc_flags_to_select(extra_exec_rustc_flags),
-            extra_rustc_flags = _rustc_flags_to_select(extra_rustc_flags),
+            extra_exec_rustc_flags = _rustc_flags_to_select(extra_exec_rustc_flags) + darwin_debug_flags,
+            extra_rustc_flags = _rustc_flags_to_select(extra_rustc_flags) + darwin_debug_flags,
+            # Retain source locations through linking; release packaging owns
+            # extracting and stripping symbols. Keep -c dbg for full debugging.
+            debug_info = {
+                "dbg": "full",
+                "fastbuild": "line-tables-only",
+                "opt": "line-tables-only",
+            },
+            strip_level = {
+                "dbg": "none",
+                "fastbuild": "none",
+                "opt": "none",
+            },
             exec_triple = triple,
             target_triple = select(target_triple_select),
             visibility = ["//visibility:public"],