diff --git a/Sources/CGRPCZlib/empty.c b/Sources/CGRPCZlib/empty.c
index a9383b3d6..13f77e710 100644
--- a/Sources/CGRPCZlib/empty.c
+++ b/Sources/CGRPCZlib/empty.c
@@ -13,3 +13,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
+
+// Xcode's Archive builds with Xcode's Package support struggle with empty .c files
+// (https://bugs.swift.org/browse/SR-12939).
+void CGRPCZlib_i_do_nothing_just_working_around_a_darwin_toolchain_bug(void) {}