MDEV-8791 - AIX: Unresolved Symbols during linking

Clean-up nolock.h: it doesn't serve any purpose anymore. Appropriate code moved
to x86-gcc.h and my_atomic.h.

If gcc sync bultins were detected, we want to make use of them independently of
__GNUC__ definition. E.g. XLC simulates those, but doesn't define __GNUC__.

HS/Spider: According to AIX manual alloca() returns char*, which cannot be
casted to any type with static_cast. Use explicit cast instead.

MDL: Removed namemangling pragma, which didn't let MariaDB build with XLC.

WSREP: _int64 seem to be conflicting name with XLC, replaced with _integer64.

CONNECT: RTLD_NOLOAD is GNU extention. Removed rather meaningless check if
library is loaded. Multiple dlopen()'s of the same library are permitted,
and it never gets closed anyway. Except for error, which was a bug: it may
close library, which can still be referenced by other subsystems.

InnoDB: __ppc_get_timebase() is GNU extention. Only use it when __GLIBC__ is
defined.

Based on contribution by flynn1973.

include/atomic/nolock.h

-#ifndef ATOMIC_NOLOCK_INCLUDED
-#define ATOMIC_NOLOCK_INCLUDED
-
-/* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
-
-   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
-   the Free Software Foundation; version 2 of the License.
-
-   This program 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.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
-
-#if defined(__i386__) || defined(_MSC_VER) || defined(__x86_64__)   \
-    || defined(HAVE_GCC_ATOMIC_BUILTINS) \
-    || defined(HAVE_SOLARIS_ATOMIC)
-
-#  ifdef MY_ATOMIC_MODE_DUMMY
-#    define LOCK_prefix ""
-#  else
-#    define LOCK_prefix "lock"
-#  endif
-/*
-  We choose implementation as follows:
-  ------------------------------------
-  On Windows using Visual C++ the native implementation should be
-  preferrable. When using gcc we prefer the Solaris implementation
-  before the gcc because of stability preference, we choose gcc
-  builtins if available, otherwise we choose the somewhat broken
-  native x86 implementation. If neither Visual C++ or gcc we still
-  choose the Solaris implementation on Solaris (mainly for SunStudio
-  compilers).
-*/
-#  if defined(_MSC_VER)
-#    include "generic-msvc.h"
-#  elif __GNUC__
-#    if defined(HAVE_SOLARIS_ATOMIC)
-#      include "solaris.h"
-#    elif defined(HAVE_GCC_ATOMIC_BUILTINS)
-#      include "gcc_builtins.h"
-#    elif defined(__i386__) || defined(__x86_64__)
-#      include "x86-gcc.h"
-#    endif
-#  elif defined(HAVE_SOLARIS_ATOMIC)
-#    include "solaris.h"
-#  endif
-#endif
-
-#endif /* ATOMIC_NOLOCK_INCLUDED */

include/atomic/x86-gcc.h

@@ -28,6 +28,12 @@
 */
 #undef MY_ATOMIC_HAS_8_AND_16
 
+#ifdef MY_ATOMIC_MODE_DUMMY
+#define LOCK_prefix ""
+#else
+#define LOCK_prefix "lock"
+#endif
+
 #ifdef __x86_64__
 #  ifdef MY_ATOMIC_NO_XADD
 #    define MY_ATOMIC_MODE "gcc-amd64" LOCK_prefix "-no-xadd"

include/my_atomic.h

@@ -112,9 +112,26 @@
 #undef MY_ATOMIC_HAS_8_16
 
 /*
- * Attempt to do atomic ops without locks
- */
-#include "atomic/nolock.h"
+  We choose implementation as follows:
+  ------------------------------------
+  On Windows using Visual C++ the native implementation should be
+  preferrable. When using gcc we prefer the Solaris implementation
+  before the gcc because of stability preference, we choose gcc
+  builtins if available, otherwise we choose the somewhat broken
+  native x86 implementation. If neither Visual C++ or gcc we still
+  choose the Solaris implementation on Solaris (mainly for SunStudio
+  compilers).
+*/
+#if defined(_MSC_VER)
+#include "atomic/generic-msvc.h"
+#elif defined(HAVE_SOLARIS_ATOMIC)
+#include "atomic/solaris.h"
+#elif defined(HAVE_GCC_ATOMIC_BUILTINS)
+#include "atomic/gcc_builtins.h"
+#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
+#include "atomic/x86-gcc.h"
+#endif
+
 
 #ifndef make_atomic_cas_body
 /* nolock.h was not able to generate even a CAS function, fall back */

plugin/handler_socket/libhsclient/allocator.hpp

@@ -35,7 +35,7 @@ typedef std::allocator<int> allocator_type;
 
 #if 1
 #define DENA_ALLOCA_ALLOCATE(typ, len) \
-	static_cast<typ *>(alloca((len) * sizeof(typ)))
+	(typ *) alloca((len) * sizeof(typ))
 #define DENA_ALLOCA_FREE(x)
 #else
 #define DENA_ALLOCA_ALLOCATE(typ, len) \

sql/mdl.h

@@ -15,15 +15,6 @@
    along with this program; if not, write to the Free Software Foundation,
    51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */
 
-#if defined(__IBMC__) || defined(__IBMCPP__)
-/* Further down, "next_in_lock" and "next_in_context" have the same type,
-   and in "sql_plist.h" this leads to an identical signature, which causes
-   problems in function overloading.
-*/
-#pragma namemangling(v5)
-#endif
-
-
 #include "sql_plist.h"
 #include <my_sys.h>
 #include <m_string.h>

sql/wsrep_var.cc

@@ -670,7 +670,7 @@ int wsrep_show_status (THD *thd, SHOW_VAR *var, char *buff,
       v->name = thd->strdup(sv->name);
       switch (sv->type) {
       case WSREP_VAR_INT64:
-        v->value = (char*)thd->memdup(&sv->value._int64, sizeof(longlong));
+        v->value = (char*)thd->memdup(&sv->value._integer64, sizeof(longlong));
         v->type  = SHOW_LONGLONG;
         break;
       case WSREP_VAR_STRING:

storage/connect/reldef.cpp

@@ -534,7 +534,7 @@ PTABDEF OEMDEF::GetXdef(PGLOBAL g)
 #endif // 0
 
   // Is the library already loaded?
-  if (!Hdll && !(Hdll = dlopen(soname, RTLD_NOLOAD)))
+  if (!Hdll)
     // Load the desired shared library
     if (!(Hdll = dlopen(soname, RTLD_LAZY))) {
       error = dlerror();

storage/innobase/include/ut0ut.h

@@ -70,7 +70,7 @@ typedef time_t	ib_time_t;
    the YieldProcessor macro defined in WinNT.h. It is a CPU architecture-
    independent way by using YieldProcessor. */
 #  define UT_RELAX_CPU() YieldProcessor()
-# elif defined(__powerpc__)
+# elif defined(__powerpc__) && defined __GLIBC__
 #include <sys/platform/ppc.h>
 #  define UT_RELAX_CPU() do { \
      volatile lint      volatile_var = __ppc_get_timebase(); \

storage/spider/hs_client/allocator.hpp

@@ -31,7 +31,7 @@ extern "C" {
 
 #if 1
 #define DENA_ALLOCA_ALLOCATE(typ, len) \
-	static_cast<typ *>(alloca((len) * sizeof(typ)))
+	(typ *) alloca((len) * sizeof(typ))
 #define DENA_ALLOCA_FREE(x)
 #else
 #define DENA_ALLOCA_ALLOCATE(typ, len) \

storage/xtradb/include/ut0ut.h

@@ -85,7 +85,7 @@ struct ut_when_dtor {
    the YieldProcessor macro defined in WinNT.h. It is a CPU architecture-
    independent way by using YieldProcessor. */
 #  define UT_RELAX_CPU() YieldProcessor()
-# elif defined(__powerpc__)
+# elif defined(__powerpc__) && defined __GLIBC__
 #include <sys/platform/ppc.h>
 #  define UT_RELAX_CPU() do { \
      volatile lint      volatile_var = __ppc_get_timebase(); \

wsrep/wsrep_api.h

@@ -502,7 +502,7 @@ struct wsrep_stats_var
     const char*      name;     //!< variable name
     wsrep_var_type_t type;     //!< variable value type
     union {
-        int64_t     _int64;
+        int64_t     _integer64;
         double      _double;
         const char* _string;
     } value;                   //!< variable value