From 2d976b61e2bd491cfc8c506b96589f56e7e4188a Mon Sep 17 00:00:00 2001
From: Frederik Seiffert <frederik@algoriddim.com>
Date: Fri, 26 Mar 2021 18:06:36 +0100
Subject: [PATCH] Export objc_enumerationMutation() function.

---
 mutation.m     | 1 +
 objc/runtime.h | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/mutation.m b/mutation.m
index 867cbb7..dfb12a0 100644
--- a/mutation.m
+++ b/mutation.m
@@ -4,6 +4,7 @@
 
 // This function is exported as a weak symbol to enable GNUstep or some other
 // framework to replace it trivially
+OBJC_PUBLIC
 void __attribute__((weak)) objc_enumerationMutation(id obj)
 {
 	fprintf(stderr, "Mutation occured during enumeration.");
diff --git a/objc/runtime.h b/objc/runtime.h
index 99a6e8c..979562c 100644
--- a/objc/runtime.h
+++ b/objc/runtime.h
@@ -1150,6 +1150,14 @@ id object_getPrototype_np(id object);
 OBJC_PUBLIC
 int objc_set_apple_compatible_objcxx_exceptions(int newValue) OBJC_NONPORTABLE;
 
+/** 
+ * This function is inserted by the compiler when a mutation is detected during
+ * a foreach iteration. It is exported as a weak symbol to enable GNUstep or
+ * some other framework to replace it trivially.
+ */
+OBJC_PUBLIC
+void __attribute__((weak)) objc_enumerationMutation(id obj);
+
 
 #define _C_ID       '@'
 #define _C_CLASS    '#'