Fix some failures in 5.1 Buildbot:

 - Fix some warnings in newer GCC (-Werror ...).
 - Fix wrong STACK_DIRECTION detected by configure due to compiler inlining.

config/ac-macros/misc.m4

@@ -456,10 +456,8 @@ fi
 AC_DEFUN([MYSQL_STACK_DIRECTION],
  [AC_CACHE_CHECK(stack direction for C alloca, ac_cv_c_stack_direction,
  [AC_TRY_RUN([#include <stdlib.h>
- /* Prevent compiler optimization by HP's compiler, see bug#42213 */
-#if defined(__HP_cc) || defined (__HP_aCC) || defined (__hpux)
-#pragma noinline
-#endif
+ /* Prevent compiler inline optimization, see bug#42213 */
+ int (volatile *ptr_f)();
  int find_stack_direction ()
  {
    static char *addr = 0;
@@ -467,14 +465,15 @@ AC_DEFUN([MYSQL_STACK_DIRECTION],
    if (addr == 0)
      {
        addr = &dummy;
-       return find_stack_direction ();
+       return (*prt_f) ();
      }
    else
      return (&dummy > addr) ? 1 : -1;
  }
  int main ()
  {
-   exit (find_stack_direction() < 0);
+   ptr_f = find_stack_direction;
+   exit ((*ptr_f)() < 0);
  }], ac_cv_c_stack_direction=1, ac_cv_c_stack_direction=-1,
    ac_cv_c_stack_direction=)])
  AC_DEFINE_UNQUOTED(STACK_DIRECTION, $ac_cv_c_stack_direction)

storage/maria/ha_maria.cc

@@ -186,7 +186,7 @@ static MYSQL_SYSVAR_ULONG(pagecache_age_threshold,
        "until it is considered aged enough to be downgraded to a warm block. "
        "This specifies the percentage ratio of that number of hits to the "
        "total number of blocks in the page cache.", 0, 0,
-        300, 100, ~0L, 100);
+        300, 100, ~(unsigned long)0, 100);
 
 static MYSQL_SYSVAR_ULONGLONG(pagecache_buffer_size, pagecache_buffer_size,
        PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
@@ -209,12 +209,12 @@ static MYSQL_SYSVAR_SET(recover, maria_recover_options, PLUGIN_VAR_OPCMDARG,
 static MYSQL_THDVAR_ULONG(repair_threads, PLUGIN_VAR_RQCMDARG,
        "Number of threads to use when repairing maria tables. The value of 1 "
        "disables parallel repair.",
-       0, 0, 1, 1, ~0L, 1);
+       0, 0, 1, 1, ~(unsigned long)0, 1);
 
 static MYSQL_THDVAR_ULONG(sort_buffer_size, PLUGIN_VAR_RQCMDARG,
        "The buffer that is allocated when sorting the index when doing a "
        "REPAIR or when creating indexes with CREATE INDEX or ALTER TABLE.",
-       0, 0, 128L*1024L*1024L, 4, ~0L, 1);
+       0, 0, 128L*1024L*1024L, 4, ~(unsigned long)0, 1);
 
 static MYSQL_THDVAR_ENUM(stats_method, PLUGIN_VAR_RQCMDARG,
        "Specifies how maria index statistics collection code should treat "

storage/maria/ma_ft_nlq_search.c

@@ -82,6 +82,7 @@ static int walk_and_match(FT_WORD *word, uint32 count, ALL_IN_ONE *aio)
 #error
 #endif
   DBUG_ENTER("walk_and_match");
+  LINT_INIT(subkeys.i);
 
   word->weight=LWS_FOR_QUERY;
 

storage/myisam/ft_nlq_search.c

@@ -83,6 +83,7 @@ static int walk_and_match(FT_WORD *word, uint32 count, ALL_IN_ONE *aio)
 #error
 #endif
   DBUG_ENTER("walk_and_match");
+  LINT_INIT(subkeys.i);
 
   word->weight=LWS_FOR_QUERY;
 

storage/xtradb/handler/ha_innodb.cc

@@ -11621,7 +11621,7 @@ static MYSQL_SYSVAR_BOOL(doublewrite, innobase_use_doublewrite,
 static MYSQL_SYSVAR_ULONG(io_capacity, srv_io_capacity,
   PLUGIN_VAR_RQCMDARG,
   "Number of IOPs the server can do. Tunes the background IO rate",
-  NULL, NULL, 200, 100, ~0L, 0);
+  NULL, NULL, 200, 100, ~0UL, 0);
 
 static MYSQL_SYSVAR_ULONG(fast_shutdown, innobase_fast_shutdown,
   PLUGIN_VAR_OPCMDARG,
@@ -11709,7 +11709,7 @@ static MYSQL_SYSVAR_BOOL(adaptive_flushing, srv_adaptive_flushing,
 static MYSQL_SYSVAR_ULONG(max_purge_lag, srv_max_purge_lag,
   PLUGIN_VAR_RQCMDARG,
   "Desired maximum length of the purge queue (0 = no limit)",
-  NULL, NULL, 0, 0, ~0L, 0);
+  NULL, NULL, 0, 0, ~0UL, 0);
 
 static MYSQL_SYSVAR_BOOL(rollback_on_timeout, innobase_rollback_on_timeout,
   PLUGIN_VAR_OPCMDARG | PLUGIN_VAR_READONLY,
@@ -11796,7 +11796,7 @@ static MYSQL_SYSVAR_ULONG(commit_concurrency, innobase_commit_concurrency,
 static MYSQL_SYSVAR_ULONG(concurrency_tickets, srv_n_free_tickets_to_enter,
   PLUGIN_VAR_RQCMDARG,
   "Number of times a thread is allowed to enter InnoDB within the same SQL query after it has once got the ticket",
-  NULL, NULL, 500L, 1L, ~0L, 0);
+  NULL, NULL, 500L, 1L, ~0UL, 0);
 
 #ifdef EXTENDED_FOR_KILLIDLE
 #define kill_idle_help_text "If non-zero value, the idle session with transaction which is idle over the value in seconds is killed by InnoDB."
@@ -11866,12 +11866,12 @@ static MYSQL_SYSVAR_LONG(open_files, innobase_open_files,
 static MYSQL_SYSVAR_ULONG(sync_spin_loops, srv_n_spin_wait_rounds,
   PLUGIN_VAR_RQCMDARG,
   "Count of spin-loop rounds in InnoDB mutexes (30 by default)",
-  NULL, NULL, 30L, 0L, ~0L, 0);
+  NULL, NULL, 30L, 0L, ~0UL, 0);
 
 static MYSQL_SYSVAR_ULONG(spin_wait_delay, srv_spin_wait_delay,
   PLUGIN_VAR_OPCMDARG,
   "Maximum delay between polling for a spin lock (6 by default)",
-  NULL, NULL, 6L, 0L, ~0L, 0);
+  NULL, NULL, 6L, 0L, ~0UL, 0);
 
 static MYSQL_SYSVAR_BOOL(thread_concurrency_timer_based,
   innobase_thread_concurrency_timer_based,
@@ -11887,7 +11887,7 @@ static MYSQL_SYSVAR_ULONG(thread_concurrency, srv_thread_concurrency,
 static MYSQL_SYSVAR_ULONG(thread_sleep_delay, srv_thread_sleep_delay,
   PLUGIN_VAR_RQCMDARG,
   "Time of innodb thread sleeping before joining InnoDB queue (usec). Value 0 disable a sleep",
-  NULL, NULL, 10000L, 0L, ~0L, 0);
+  NULL, NULL, 10000L, 0L, ~0UL, 0);
 
 static MYSQL_SYSVAR_STR(data_file_path, innobase_data_file_path,
   PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,