mach-defpager: Declare `__malloc_initialize_hook' as volatile.

* mach-defpager/kalloc.c (__MALLOC_HOOK_VOLATILE): New macro.

1 files changed, 7 insertions, 1 deletions

diff --git a/mach-defpager/kalloc.c b/mach-defpager/kalloc.c
index 28c0b55e..5d91aceb 100644
--- a/mach-defpager/kalloc.c
+++ b/mach-defpager/kalloc.c
@@ -40,7 +40,13 @@ static void init_hook (void);
 static void *malloc_hook (size_t size, const void *caller);
 static void free_hook (void *ptr, const void *caller);
 
-void (*__malloc_initialize_hook) (void) = init_hook;
+/* GNU libc 2.14 defines this macro to declare hook variables as volatile.
+   Define it as empty for older libc versions.  */
+#ifndef __MALLOC_HOOK_VOLATILE
+# define __MALLOC_HOOK_VOLATILE
+#endif
+
+void (*__MALLOC_HOOK_VOLATILE __malloc_initialize_hook) (void) = init_hook;
 
 
 #define	DEBUG