diff --git a/lib/generators/modules/GenerateModuleObjCpp/index.js b/lib/generators/modules/GenerateModuleObjCpp/index.js
index 927711514d2deaa3c795fb98e676e0a1f596eddc..0364d66204a76fccd3e06a0dc72bf801aa04a50d 100644
--- a/lib/generators/modules/GenerateModuleObjCpp/index.js
+++ b/lib/generators/modules/GenerateModuleObjCpp/index.js
@@ -67,9 +67,12 @@ const HeaderFileTemplate = ({
  * must have a single output. More files => more genrule()s => slower builds.
  */
 
-#ifndef __cplusplus
-#error This file must be compiled as Obj-C++. If you are importing it, you must change your file extension to .mm.
-#endif
+// Patched: guard the Obj-C++ body with __cplusplus instead of hard-#error-ing.
+// With use_frameworks! :static + New Arch, plain Obj-C .m TUs can trigger a
+// Clang module build (via Swift-interop -Swift.h umbrellas) that pulls this
+// header in Obj-C mode. Skipping the body (instead of erroring) lets the module
+// build; .mm consumers still get the full Obj-C++ contents unchanged.
+#if defined(__cplusplus)
 
 // Avoid multiple includes of ${headerFileNameWithNoExt} symbols
 #ifndef ${headerFileNameWithNoExt}_H
@@ -93,7 +96,7 @@ const HeaderFileTemplate = ({
     structInlineMethods +
     (assumeNonnull ? '\nNS_ASSUME_NONNULL_END\n' : '\n') +
     `#endif // ${headerFileNameWithNoExt}_H` +
-    '\n'
+    '\n#endif // defined(__cplusplus)\n'
   );
 };
 const SourceFileTemplate = ({headerFileName, moduleImplementations}) => `/**