/*
* Compiler specific macros.
*
- * Copyright (C) 2013 Simon Ruderich
+ * Copyright (C) 2013-2014 Simon Ruderich
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
#ifndef COMPILER_H
#define COMPILER_H 1
-/* Prevent/force inlining. Used to improve performance. */
#ifdef HAVE___ATTRIBUTE__
+/* Prevent/force inlining. Used to improve performance. */
# define noinline __attribute__((noinline))
# define always_inline __attribute__((always_inline))
+/* Unused parameter. */
+# define unused __attribute__((unused))
+/* Mark the function protected, which means it can't be overwritten by other
+ * modules (libraries), e.g. with LD_PRELOAD); otherwise same as the default
+ * visibility. This causes the compiler not use the PLT (and no relocations)
+ * for local calls from inside this module; but the symbols are still
+ * exported. This is faster and in this case prevents useless lookups as we
+ * hook those functions and nobody else should modify them. Not strictly
+ * necessary, but nice to have. */
+# define visibility_protected __attribute__((visibility("protected")))
#else
# define noinline
# define always_inline
+# define unused
+# define visibility_protected
#endif
/* Branch prediction information for the compiler. */