Fix some compiler warnings seen in Buildbot.

Add some extra error output and code cleanup in an attempt to fix/debug
a rare random testsuite problem in check_warnings, where the exit code
from mysqltest is somehow corrupted inside mysql-test-run.pl.

include/my_global.h:
  Fix compiler warnings on some platforms.
mysql-test/lib/My/SafeProcess.pm:
  Move dereference of $? subprocess exit code closer to where it is generated,
  to make the code more robust and on the chance that this will fix the
  occasional problems in check_warnings we see in Buildbot.
mysql-test/mysql-test-run.pl:
  When check_warnings failed, also log the mysqld server for which it failed.
sql/sql_lex.cc:
  Fix compiler warning about possibly uninitialised value, by rewriting a for()
  loop that is always executed at least once into a do .. while() loop with an
  assert.
sql/table.cc:
  Fix compiler warning about uninitialised value.
storage/federatedx/ha_federatedx.cc:
  Fix uninitialised variable.
storage/maria/ma_delete.c:
  Fix compiler warning about uninitialised value.
storage/maria/ma_loghandler.c:
  Fix compiler warning about uninitialised value.
storage/myisam/ft_stopwords.c:
  Fix compiler warning.
storage/myisam/mi_write.c:
  Fix compiler warning about possibly uninitialised value, by rewriting a while()
  loop that is always executed at least once into a do .. while() loop with an
  assert.
storage/xtradb/btr/btr0cur.c:
  Fix compiler warning about possibly uninitialised value.
support-files/compiler_warnings.supp:
  Fix warning suppression to cover all cases in yassl.
vio/viossl.c:
  Fix compiler warning.

include/my_global.h

@@ -1260,9 +1260,9 @@ do { doubleget_union _tmp; \
                          } while (0)
 #define float4get(V,M)   do { *((float *) &(V)) = *((const float*) (M)); } while(0)
 #define float8get(V,M)   doubleget((V),(M))
-#define float4store(V,M) memcpy((uchar*) V,(const uchar*) (&M),sizeof(float))
-#define floatstore(T,V)  memcpy((uchar*)(T), (const uchar*)(&V),sizeof(float))
-#define floatget(V,M)    memcpy((uchar*) &V,(const uchar*) (M),sizeof(float))
+#define float4store(V,M) memcpy((uchar*) V,(uchar*) (&M),sizeof(float))
+#define floatstore(T,V)  memcpy((uchar*)(T), (uchar*)(&V),sizeof(float))
+#define floatget(V,M)    memcpy((uchar*) &V,(uchar*) (M),sizeof(float))
 #define float8store(V,M) doublestore((V),(M))
 #else
 

mysql-test/lib/My/SafeProcess.pm

@@ -384,9 +384,9 @@ sub kill {
 
 
 sub _collect {
-  my ($self)= @_;
+  my ($self, $exit_code)= @_;
 
-  $self->{EXIT_STATUS}= $?;
+  $self->{EXIT_STATUS}= $exit_code;
   _verbose("_collect: $self");
 
   # Take the process out of running list
@@ -453,6 +453,7 @@ sub wait_one {
   #_verbose("blocking: $blocking, use_alarm: $use_alarm");
 
   my $retpid;
+  my $exit_code;
   eval
   {
     # alarm should break the wait
@@ -461,6 +462,7 @@ sub wait_one {
     alarm($timeout) if $use_alarm;
 
     $retpid= waitpid($pid, $blocking ? 0 : &WNOHANG);
+    $exit_code= $?;
 
     alarm(0) if $use_alarm;
   };
@@ -492,7 +494,7 @@ sub wait_one {
   #warn "wait_one: expected pid $pid but got $retpid"
   #  unless( $retpid == $pid );
 
-  $self->_collect();
+  $self->_collect($exit_code);
   return 0;
 }
 
@@ -505,6 +507,8 @@ sub wait_one {
 #
 sub wait_any {
   my $ret_pid;
+  my $exit_code;
+
   if (IS_WIN32PERL) {
     # Can't wait for -1 => use a polling loop
     do {
@@ -514,6 +518,7 @@ sub wait_any {
 	last if $pid == $ret_pid;
       }
     } while ($ret_pid == 0);
+    $exit_code= $?;
   }
   else
   {
@@ -523,6 +528,7 @@ sub wait_any {
       print STDERR "wait_any, got invalid pid: $ret_pid\n";
       return undef;
     }
+    $exit_code= $?;
   }
 
   # Look it up in "running" table
@@ -532,7 +538,7 @@ sub wait_any {
     print STDERR "running: ". join(", ", keys(%running)). "\n";
     return undef;
   }
-  $proc->_collect;
+  $proc->_collect($exit_code);
   return $proc;
 }
 

mysql-test/mysql-test-run.pl

@@ -4102,7 +4102,7 @@ sub start_check_warnings ($$) {
      error         => $errfile,
      output        => $errfile,
      args          => \$args,
-     user_data     => $errfile,
+     user_data     => [$errfile, $mysqld],
      verbose       => $opt_verbose,
     );
   mtr_verbose("Started $proc");
@@ -4148,7 +4148,7 @@ sub check_warnings ($) {
     if ( delete $started{$proc->pid()} ) {
       # One check warning process returned
       my $res= $proc->exit_status();
-      my $err_file= $proc->user_data();
+      my ($err_file, $mysqld)= @{$proc->user_data()};
 
       if ( $res == 0 or $res == 62 ){
 
@@ -4184,7 +4184,8 @@ sub check_warnings ($) {
 	my $report= mtr_grab_file($err_file);
 	$tinfo->{comment}.=
 	  "Could not execute 'check-warnings' for ".
-	    "testcase '$tname' (res: $res):\n";
+	    "testcase '$tname' (res: $res) server: '".
+              $mysqld->name() .":\n";
 	$tinfo->{comment}.= $report;
 
 	$result= 2;

sql/sql_lex.cc

@@ -1842,13 +1842,15 @@ void st_select_lex_unit::exclude_tree()
 void st_select_lex::mark_as_dependent(st_select_lex *last, Item *dependency)
 {
   SELECT_LEX *next_to_last;
+
+  DBUG_ASSERT(this != last);
+
   /*
     Mark all selects from resolved to 1 before select where was
     found table as depended (of select where was found table)
   */
-  for (SELECT_LEX *s= this;
-       s && s != last;
-       s= s->outer_select())
+  SELECT_LEX *s= this;
+  do
   {
     if (!(s->uncacheable & UNCACHEABLE_DEPENDENT))
     {
@@ -1866,7 +1868,8 @@ void st_select_lex::mark_as_dependent(st_select_lex *last, Item *dependency)
       }
     }
     next_to_last= s;
-  }
+  } while ((s= s->outer_select()) != last && s != 0);
+
   is_correlated= TRUE;
   this->master_unit()->item->is_correlated= TRUE;
   if (dependency)

sql/table.cc

@@ -2053,6 +2053,8 @@ ulong get_form_pos(File file, uchar *head, TYPELIB *save_names)
   ulong ret_value=0;
   DBUG_ENTER("get_form_pos");
 
+  LINT_INIT(buf);
+
   names=uint2korr(head+8);
   a_length=(names+2)*sizeof(char *);		/* Room for two extra */
 

storage/federatedx/ha_federatedx.cc

@@ -1783,7 +1783,7 @@ int ha_federatedx::open(const char *name, int mode, uint test_if_locked)
 
 int ha_federatedx::close(void)
 {
-  int retval, error;
+  int retval= 0, error;
   THD *thd= current_thd;
   DBUG_ENTER("ha_federatedx::close");
 

storage/maria/ma_delete.c

@@ -169,6 +169,8 @@ my_bool _ma_ck_delete(MARIA_HA *info, MARIA_KEY *key)
   MARIA_KEY org_key;
   DBUG_ENTER("_ma_ck_delete");
 
+  LINT_INIT_STRUCT(org_key);
+
   save_key_data= key->data;
   if (share->now_transactional)
   {

storage/maria/ma_loghandler.c

@@ -1394,6 +1394,7 @@ LSN translog_get_file_max_lsn_stored(uint32 file)
 
   {
     LOGHANDLER_FILE_INFO info;
+    LINT_INIT_STRUCT(info);
     File fd= open_logfile_by_number_no_cache(file);
     if ((fd < 0) ||
         (translog_read_file_header(&info, fd) | my_close(fd, MYF(MY_WME))))

storage/myisam/ft_stopwords.c

@@ -45,7 +45,7 @@ static int ft_add_stopword(const char *w)
 {
   FT_STOPWORD sw;
   return !w ||
-         (((sw.len= (uint) strlen(sw.pos=w)) >= ft_min_word_len) &&
+    (((sw.len= (uint) strlen(sw.pos=(const uchar *)w)) >= ft_min_word_len) &&
           (tree_insert(stopwords3, &sw, 0, stopwords3->custom_arg)==NULL));
 }
 

storage/myisam/mi_write.c

@@ -735,10 +735,12 @@ static uchar *_mi_find_last_pos(MI_KEYDEF *keyinfo, uchar *page,
   }
 
   end=page+length-key_ref_length;
+  DBUG_ASSERT(page < end);
   *key='\0';
   length=0;
   lastpos=page;
-  while (page < end)
+
+  do
   {
     prevpos=lastpos; lastpos=page;
     last_length=length;
@@ -749,7 +751,8 @@ static uchar *_mi_find_last_pos(MI_KEYDEF *keyinfo, uchar *page,
       my_errno=HA_ERR_CRASHED;
       DBUG_RETURN(0);
     }
-  }
+  } while (page < end);
+
   *return_key_length=last_length;
   *after_key=lastpos;
   DBUG_PRINT("exit",("returns: 0x%lx  page: 0x%lx  end: 0x%lx",

storage/xtradb/btr/btr0cur.c

@@ -3233,7 +3233,7 @@ btr_estimate_number_of_different_key_vals(
 	ulint		matched_bytes;
 	ib_int64_t	n_recs	= 0;
 	ib_int64_t*	n_diff;
-	ib_int64_t*	n_not_nulls;
+	ib_int64_t*	n_not_nulls= 0;
 	ullint		n_sample_pages; /* number of pages to sample */
 	ulint		not_empty_flag	= 0;
 	ulint		total_external_size = 0;

support-files/compiler_warnings.supp

@@ -108,7 +108,7 @@ ha_pbxt\.cc : variable.*might be clobbered by.*longjmp
 #
 # Yassl
 include/runtime.hpp: .*pure_error.*
-.*/extra/yassl/taocrypt/.*: comparison with string literal
+.*/extra/yassl/.*taocrypt/.*: comparison with string literal
 .*/extra/yassl/taocrypt/src/blowfish\.cpp: array subscript is above array bounds
 .*/extra/yassl/taocrypt/src/file\.cpp: ignoring return value
 .*/extra/yassl/taocrypt/src/integer\.cpp: control reaches end of non-void function

vio/viossl.c

@@ -75,9 +75,11 @@ report_errors(SSL* ssl)
 
   if (ssl)
   {
+#ifndef DBUG_OFF
     int error= SSL_get_error(ssl, l);
     DBUG_PRINT("error", ("error: %s (%d)",
                          ERR_error_string(error, buf), error));
+#endif
   }
 
   DBUG_PRINT("info", ("socket_errno: %d", socket_errno));