Index: src/bridge/NSArray+OFObject.h
==================================================================
--- src/bridge/NSArray+OFObject.h
+++ src/bridge/NSArray+OFObject.h
@@ -17,10 +17,18 @@
 #import <Foundation/NSArray.h>
 
 #import "NSBridging.h"
 
 NS_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int _NSArray_OFObject_reference;
+#ifdef __cplusplus
+}
+#endif
 
 /*!
  * @category NSArray (OFObject) \
  *	     NSArray+OFObject.h ObjFW-Bridge/NSArray+OFObject.h
  *

Index: src/bridge/NSArray+OFObject.m
==================================================================
--- src/bridge/NSArray+OFObject.m
+++ src/bridge/NSArray+OFObject.m
@@ -14,12 +14,14 @@
  * file.
  */
 
 #import "NSArray+OFObject.h"
 #import "OFArray_NSArray.h"
+
+int _NSArray_OFObject_reference;
 
 @implementation NSArray (OFObject)
 - (id)OFObject
 {
 	return [[[OFArray_NSArray alloc] initWithNSArray: self] autorelease];
 }
 @end

Index: src/bridge/NSDictionary+OFObject.h
==================================================================
--- src/bridge/NSDictionary+OFObject.h
+++ src/bridge/NSDictionary+OFObject.h
@@ -17,10 +17,18 @@
 #import <Foundation/NSDictionary.h>
 
 #import "NSBridging.h"
 
 NS_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int _NSDictionary_OFObject_reference;
+#ifdef __cplusplus
+}
+#endif
 
 /*!
  * @category NSDictionary (OFObject) \
  *	     NSDictionary+OFObject.h ObjFW-Bridge/NSDictionary+OFObject.h
  *

Index: src/bridge/NSDictionary+OFObject.m
==================================================================
--- src/bridge/NSDictionary+OFObject.m
+++ src/bridge/NSDictionary+OFObject.m
@@ -14,13 +14,15 @@
  * file.
  */
 
 #import "NSDictionary+OFObject.h"
 #import "OFDictionary_NSDictionary.h"
+
+int _NSDictionary_OFObject_reference;
 
 @implementation NSDictionary (OFObject)
 - (id)OFObject
 {
 	return [[[OFDictionary_NSDictionary alloc]
 	    initWithNSDictionary: self] autorelease];
 }
 @end

Index: src/bridge/NSString+OFObject.h
==================================================================
--- src/bridge/NSString+OFObject.h
+++ src/bridge/NSString+OFObject.h
@@ -17,10 +17,18 @@
 #import <Foundation/NSString.h>
 
 #import "NSBridging.h"
 
 NS_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int _NSString_OFObject_reference;
+#ifdef __cplusplus
+}
+#endif
 
 /*!
  * @category NSString (OFObject)
  *	     NSString+OFObject.h ObjFW-Bridge/NSString+OFObject.h
  *

Index: src/bridge/NSString+OFObject.m
==================================================================
--- src/bridge/NSString+OFObject.m
+++ src/bridge/NSString+OFObject.m
@@ -14,12 +14,14 @@
  * file.
  */
 
 #import "NSString+OFObject.h"
 #import "OFString.h"
+
+int _NSString_OFObject_reference;
 
 @implementation NSString (OFObject)
 - (id)OFObject
 {
 	return [OFString stringWithUTF8String: [self UTF8String]];
 }
 @end

Index: src/bridge/OFArray+NSObject.h
==================================================================
--- src/bridge/OFArray+NSObject.h
+++ src/bridge/OFArray+NSObject.h
@@ -25,10 +25,18 @@
 #endif
 
 #import "OFBridging.h"
 
 OF_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int _OFArray_NSObject_reference;
+#ifdef __cplusplus
+}
+#endif
 
 /*!
  * @category OFArray (NSObject) \
  *	     OFArray+NSObject.h ObjFW-Bridge/OFArray+NSObject.h
  * @brief Support for bridging OFArrays to NSArrays.

Index: src/bridge/OFArray+NSObject.m
==================================================================
--- src/bridge/OFArray+NSObject.m
+++ src/bridge/OFArray+NSObject.m
@@ -15,12 +15,14 @@
  */
 
 #import "NSArray_OFArray.h"
 
 #import "OFArray+NSObject.h"
+
+int _OFArray_NSObject_reference;
 
 @implementation OFArray (NSObject)
 - (id)NSObject
 {
 	return [[[NSArray_OFArray alloc] initWithOFArray: self] autorelease];
 }
 @end

Index: src/bridge/OFDictionary+NSObject.h
==================================================================
--- src/bridge/OFDictionary+NSObject.h
+++ src/bridge/OFDictionary+NSObject.h
@@ -25,10 +25,18 @@
 #endif
 
 #import "OFBridging.h"
 
 OF_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int _OFDictionary_NSObject_reference;
+#ifdef __cplusplus
+}
+#endif
 
 /*!
  * @category OFDictionary (NSObject) \
  *	     OFDictionary+NSObject.h ObjFW-Bridge/OFDictionary+NSObject.h
  *

Index: src/bridge/OFDictionary+NSObject.m
==================================================================
--- src/bridge/OFDictionary+NSObject.m
+++ src/bridge/OFDictionary+NSObject.m
@@ -15,13 +15,15 @@
  */
 
 #import "NSDictionary_OFDictionary.h"
 
 #import "OFDictionary+NSObject.h"
+
+int _OFDictionary_NSObject_reference;
 
 @implementation OFDictionary (NSObject)
 - (id)NSObject
 {
 	return [[[NSDictionary_OFDictionary alloc]
 	    initWithOFDictionary: self] autorelease];
 }
 @end

Index: src/bridge/OFString+NSObject.h
==================================================================
--- src/bridge/OFString+NSObject.h
+++ src/bridge/OFString+NSObject.h
@@ -25,10 +25,18 @@
 #endif
 
 #import "OFBridging.h"
 
 OF_ASSUME_NONNULL_BEGIN
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern int _OFString_NSObject_reference;
+#ifdef __cplusplus
+}
+#endif
 
 /*!
  * @category OFString (NSObject) \
  *	     OFString+NSObject.h ObjFW-Bridge/OFString+NSObject.h
  *

Index: src/bridge/OFString+NSObject.m
==================================================================
--- src/bridge/OFString+NSObject.m
+++ src/bridge/OFString+NSObject.m
@@ -17,10 +17,12 @@
 #import <Foundation/NSString.h>
 
 #import "OFString+NSObject.h"
 
 #import "OFInitializationFailedException.h"
+
+int _OFString_NSObject_reference;
 
 @implementation OFString (NSObject)
 - (id)NSObject
 {
 	NSString *string = [NSString stringWithUTF8String: [self UTF8String]];