stdin.patch

diff --git i/mkspecs/features/data/mac/objc_namespace.sh w/mkspecs/features/data/mac/objc_namespace.sh
index ceff2df324c..2d6585c8b7d 100755
--- i/mkspecs/features/data/mac/objc_namespace.sh
+++ w/mkspecs/features/data/mac/objc_namespace.sh
@@ -129,6 +129,11 @@ inspect_binary() {
 
     classnames_section="__objc_classname"
     classnames=$(otool -v -s __TEXT $classnames_section "$target" | tail -n +3)
+    if [ -z "$classnames" ]; then
+        echo "no Objective-C classes in binary."
+        exit 0
+    fi
+    echo
     while read -a classname; do
         address=$(sanitize_address ${classname[0]})
         name=${classname[1]}
@@ -146,7 +151,12 @@ inspect_binary() {
         echo "found namespaced class names, updating class entries..."
     fi
 
-    classes=$(otool -o -v "$target" | grep class_ro_t)
+    classes=$(otool -o -v "$target" | grep -E "(class_ro_t|__OBJC_CLASS_RO)")
+    if [ -z "$classes" ]; then
+        echo " 💥  failed to read class details"
+        exit 1
+    fi
+
     while read -a class; do
         address="$(sanitize_address ${class[1]})"