atexit.c: New file.

* config/rs6000/atexit.c: New file.
* config/rs6000/t-aix-cxa (LIB2ADDEH): Build atexit.c.
* config/rs6000/libgcc-aix-cxa.ver (atexit): Add symbol to exports.
* config/rs6000/cxa_finalize.c
(catomic_compare_and_exchange_bool_acq): Negate return value.

From-SVN: r229932

libgcc/ChangeLog

+2015-11-07  David Edelsohn  <dje.gcc@gmail.com>
+
+	* config/rs6000/atexit.c: New file.
+	* config/rs6000/t-aix-cxa (LIB2ADDEH): Build atexit.c.
+	* config/rs6000/libgcc-aix-cxa.ver (atexit): Add symbol to exports.
+	* config/rs6000/cxa_finalize.c
+	(catomic_compare_and_exchange_bool_acq): Negate return value.
+
 2015-10-30  Venkataramanan Kumar  <venkataramanan.kumar@amd.com>
 
 	* config/i386/cpuinfo.c (enum processor_types): Add AMDFAM17H.

libgcc/config/rs6000/atexit.c

+/* Copyright (C) 1999-2015 Free Software Foundation, Inc.
+
+   NOTE: This source is derived from an old version taken from the GNU C
+   Library (glibc).
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include <stdlib.h>
+#include "exit.h"
+
+
+/* This is defined by newer gcc version unique for each module.  */
+extern void *__dso_handle __attribute__ ((__weak__));
+
+
+/* Register FUNC to be executed by `exit'.  */
+int
+#ifndef atexit
+attribute_hidden
+#endif
+atexit (void (*func) (void))
+{
+  return __cxa_atexit ((void (*) (void *)) func, NULL,
+		       &__dso_handle == NULL ? NULL : __dso_handle);
+}

libgcc/config/rs6000/cxa_finalize.c

@@ -32,8 +32,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 static boolean_t
 catomic_compare_and_exchange_bool_acq (long *mem, long newval, long oldval)
 {
-  return __atomic_compare_exchange (mem, &oldval, &newval, 0,
-				    __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
+  return ! __atomic_compare_exchange (mem, &oldval, &newval, 0,
+				      __ATOMIC_ACQUIRE, __ATOMIC_ACQUIRE);
 }
 
 /* If D is non-NULL, call all functions registered with `__cxa_atexit'

libgcc/config/rs6000/libgcc-aix-cxa.ver

@@ -7,3 +7,7 @@ GCC_4.9 {
   _GLOBAL__AIXI_shr_o
   _GLOBAL__AIXD_shr_o
 }
+
+GCC_5 {
+  atexit
+}

libgcc/config/rs6000/t-aix-cxa

 LIB2ADDEH += $(srcdir)/config/rs6000/cxa_atexit.c \
-	$(srcdir)/config/rs6000/cxa_finalize.c
+	$(srcdir)/config/rs6000/cxa_finalize.c \
+	$(srcdir)/config/rs6000/atexit.c
 
 LIB2ADD_ST += $(srcdir)/config/rs6000/aixinitfini.c