[NaCl SDK] nacl-mounts example.

native_client_sdk/src/libraries/utils/macros.h

 /* Copyright (c) 2012 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #ifndef LIBRARIES_UTILS_MACROS_H_
 #define LIBRARIES_UTILS_MACROS_H_
 
 /**
  * A macro to disallow the evil copy constructor and operator= functions
  * This should be used in the private: declarations for a class.
  */
 #define DISALLOW_COPY_AND_ASSIGN(TypeName)      \
   TypeName(const TypeName&);                    \
   void operator=(const TypeName&)
 
 /** returns the size of a member of a struct. */
 #define MEMBER_SIZE(struct_name, member) sizeof(((struct_name*)0)->member)
 
 /**
  * Macros to prevent name mangling of defnitions, allowing them to be
  * referenced from C.
  */
 #ifdef __cplusplus
 # define EXTERN_C_BEGIN  extern "C" {
 # define EXTERN_C_END    }
 #else
 # define EXTERN_C_BEGIN
-# define EXEERN_C_END
+# define EXTERN_C_END
 #endif  /* __cplusplus */
 
+/**
+ * Macros to help force linkage of symbols that otherwise would not be
+ * included.
+ *
+ * // In a source file that you want to force linkage (file scope):
+ * FORCE_LINK_THIS(myfilename);
+ *
+ * // In a source file that you are sure will be linked (file scope):
+ * FORCE_LINK_THAT(myfilename)
+ *
+ */
+#define FORCE_LINK_THIS(x) int force_link_##x = 0;
+#define FORCE_LINK_THAT(x) \
+  void force_link_function_##x() { \
+    extern int force_link_##x; \
+    force_link_##x = 1; \
+  }
 
 #endif  /* LIBRARIES_UTILS_MACROS_H_ */