malloc: Remove __malloc_initialize_hook from the API [BZ #19564]

__malloc_initialize_hook is interposed by application code, so
the usual approach to define a compatibility symbol does not work.
This commit adds a new mechanism based on #pragma GCC poison in
<stdc-predef.h>.

1 files changed, 3 insertions, 1 deletions

diff --git a/malloc/arena.c b/malloc/arena.c
index 1dd9deef0e..64a118c319 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -340,9 +340,11 @@ ptmalloc_init (void)
       if (check_action != 0)
         __malloc_check_init ();
     }
-  void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook);
+#if HAVE_MALLOC_INIT_HOOK
+  void (*hook) (void) = atomic_forced_read (old__malloc_initialize_hook);
   if (hook != NULL)
     (*hook)();
+#endif
   __malloc_initialized = 1;
 }