From 92e1ab0eb58c57d5843fa982ff6c24f551f2f634 Mon Sep 17 00:00:00 2001
From: Florian Weimer <fweimer@redhat.com>
Date: Mon, 20 Jun 2016 11:11:29 +0200
Subject: Revert __malloc_initialize_hook symbol poisoning

It turns out the Emacs-internal malloc implementation uses
__malloc_* symbols.  If glibc poisons them in <stdc-pre.h>,
Emacs will no longer compile.
---
 malloc/Makefile       | 14 --------------
 malloc/arena.c        |  2 +-
 malloc/malloc-hooks.h |  5 +----
 malloc/malloc.c       |  6 +++---
 malloc/mcheck-init.c  |  2 +-
 5 files changed, 6 insertions(+), 23 deletions(-)

(limited to 'malloc')

diff --git a/malloc/Makefile b/malloc/Makefile
index 91eb17dd7a..fa1730ecb7 100644
--- a/malloc/Makefile
+++ b/malloc/Makefile
@@ -115,20 +115,6 @@ endif
 
 include ../Rules
 
-# Support references to removed APIs.  We use #pragma GCC poison in
-# <stdc-predef.h> to make it difficult to reference them.  For select
-# source files, we work around this poisoning by defining a macro on
-# the command line (which is processed before <stdc-predef.h> and can
-# therefore use tokens poisoned later).
-poisoned_apis = \
-  __malloc_initialize_hook \
-
-unpoisoned_api_defines := \
-  $(foreach sym,$(poisoned_apis), \
-    $(patsubst %,-Dold%, $(sym))=$(sym))
-CPPFLAGS-malloc.c = $(unpoisoned_api_defines)
-CPPFLAGS-mcheck-init.c = $(unpoisoned_api_defines)
-
 CFLAGS-mcheck-init.c = $(PIC-ccflag)
 CFLAGS-obstack.c = $(uses-callbacks)
 
diff --git a/malloc/arena.c b/malloc/arena.c
index 64a118c319..ed5a4d5cd3 100644
--- a/malloc/arena.c
+++ b/malloc/arena.c
@@ -341,7 +341,7 @@ ptmalloc_init (void)
         __malloc_check_init ();
     }
 #if HAVE_MALLOC_INIT_HOOK
-  void (*hook) (void) = atomic_forced_read (old__malloc_initialize_hook);
+  void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook);
   if (hook != NULL)
     (*hook)();
 #endif
diff --git a/malloc/malloc-hooks.h b/malloc/malloc-hooks.h
index 3be391b6fb..c7aa8b2d53 100644
--- a/malloc/malloc-hooks.h
+++ b/malloc/malloc-hooks.h
@@ -19,9 +19,6 @@
 #ifndef _MALLOC_HOOKS_H
 #define _MALLOC_HOOKS_H
 
-/* These hooks are no longer part of the public API and are poisoned
-   in <stdc-predef.h>.  Their names here reflect the command-line
-   mapping which is used inside glibc to get past the poisoning.  */
-void (*old__malloc_initialize_hook) (void);
+void (*__malloc_initialize_hook) (void);
 
 #endif  /* _MALLOC_HOOKS_H */
diff --git a/malloc/malloc.c b/malloc/malloc.c
index 21a912a6d1..1f5f166ea2 100644
--- a/malloc/malloc.c
+++ b/malloc/malloc.c
@@ -1851,9 +1851,9 @@ static void *memalign_hook_ini (size_t alignment, size_t sz,
                                 const void *caller) __THROW;
 
 #if HAVE_MALLOC_INIT_HOOK
-void weak_variable (*old__malloc_initialize_hook) (void) = NULL;
-compat_symbol (libc, old__malloc_initialize_hook,
-	       old__malloc_initialize_hook, GLIBC_2_0);
+void weak_variable (*__malloc_initialize_hook) (void) = NULL;
+compat_symbol (libc, __malloc_initialize_hook,
+	       __malloc_initialize_hook, GLIBC_2_0);
 #endif
 
 void weak_variable (*__free_hook) (void *__ptr,
diff --git a/malloc/mcheck-init.c b/malloc/mcheck-init.c
index 3218bb03b9..8d63dd3488 100644
--- a/malloc/mcheck-init.c
+++ b/malloc/mcheck-init.c
@@ -27,4 +27,4 @@ turn_on_mcheck (void)
   mcheck (NULL);
 }
 
-void (*old__malloc_initialize_hook) (void) = turn_on_mcheck;
+void (*__malloc_initialize_hook) (void) = turn_on_mcheck;
-- 
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