Removed some alias warnings

Fixed alias bug when compiling with gcc 4.2.4 that caused subselect.test to fail

sql/item.cc:
  Removed alias warnings by changing type from char * to const char*
sql/item.h:
  Removed alias warnings by changing type from char * to const char*
sql/item_subselect.cc:
  Fixed alias bug when compiling with gcc 4.2.4 that caused subselect.test to fail
sql/sql_string.h:
  Removed alias warnings by changing type from char * to const char*
storage/heap/hp_test2.c:
  Removed SAFEMALLOC to get rid of compiler error
  Fixed test case as we can't anymore use heap_rlast() on a HASH key entry.

sql/item.cc

@@ -2608,18 +2608,19 @@ void Item_string::print(String *str, enum_query_type query_type)
 
 
 double 
-double_from_string_with_check (CHARSET_INFO *cs, const char *cptr, char *end)
+double_from_string_with_check(CHARSET_INFO *cs, const char *cptr,
+                              const char *end)
 {
   int error;
-  char *org_end;
+  char *end_of_num= (char*) end;
   double tmp;
 
-  org_end= end;
-  tmp= my_strntod(cs, (char*) cptr, end - cptr, &end, &error);
-  if (error || (end != org_end && !check_if_only_end_space(cs, end, org_end)))
+  tmp= my_strntod(cs, (char*) cptr, end - cptr, &end_of_num, &error);
+  if (error || (end != end_of_num &&
+                !check_if_only_end_space(cs, end_of_num, end)))
   {
     char buff[80];
-    strmake(buff, cptr, min(sizeof(buff)-1, (size_t) (org_end-cptr)));
+    strmake(buff, cptr, min(sizeof(buff)-1, (size_t) (end-cptr)));
     push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                         ER_TRUNCATED_WRONG_VALUE,
                         ER(ER_TRUNCATED_WRONG_VALUE), "DOUBLE",
@@ -2634,26 +2635,27 @@ double Item_string::val_real()
   DBUG_ASSERT(fixed == 1);
   return double_from_string_with_check(str_value.charset(),
                                        str_value.ptr(), 
-                                       (char *) str_value.ptr() +
+                                       str_value.ptr() +
                                        str_value.length());
 }
 
 
 longlong 
-longlong_from_string_with_check (CHARSET_INFO *cs, const char *cptr, char *end)
+longlong_from_string_with_check(CHARSET_INFO *cs, const char *cptr,
+                                const char *end)
 {
   int err;
   longlong tmp;
-  char *org_end= end;
+  char *end_of_num= (char*) end;
 
-  tmp= (*(cs->cset->strtoll10))(cs, cptr, &end, &err);
+  tmp= (*(cs->cset->strtoll10))(cs, cptr, &end_of_num, &err);
   /*
     TODO: Give error if we wanted a signed integer and we got an unsigned
     one
   */
   if (!current_thd->no_errors &&
       (err > 0 ||
-       (end != org_end && !check_if_only_end_space(cs, end, org_end))))
+       (end != end_of_num && !check_if_only_end_space(cs, end_of_num, end))))
   {
     push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                         ER_TRUNCATED_WRONG_VALUE,
@@ -2672,7 +2674,7 @@ longlong Item_string::val_int()
 {
   DBUG_ASSERT(fixed == 1);
   return longlong_from_string_with_check(str_value.charset(), str_value.ptr(),
-                             (char *) str_value.ptr()+ str_value.length());
+                                         str_value.ptr()+ str_value.length());
 }
 
 

sql/item.h

@@ -2289,9 +2289,11 @@ private:
 
 
 longlong 
-longlong_from_string_with_check (CHARSET_INFO *cs, const char *cptr, char *end);
+longlong_from_string_with_check(CHARSET_INFO *cs, const char *cptr,
+                                const char *end);
 double 
-double_from_string_with_check (CHARSET_INFO *cs, const char *cptr, char *end);
+double_from_string_with_check(CHARSET_INFO *cs, const char *cptr,
+                              const char *end);
 
 class Item_static_string_func :public Item_string
 {

sql/item_subselect.cc

@@ -82,7 +82,6 @@ void Item_subselect::init(st_select_lex *select_lex,
   else
   {
     SELECT_LEX *outer_select= unit->outer_select();
-    DBUG_ASSERT(thd);
     /*
       do not take into account expression inside aggregate functions because
       they can access original table fields
@@ -3563,7 +3562,15 @@ subselect_single_select_engine::change_result(Item_subselect *si,
   }
   else
     result= res;
-  return select_lex->join->change_result(result);
+
+  /*
+    We can't use 'result' below as gcc 4.2.4's alias optimization
+    assumes that result was not changed by thd->change_item_tree().
+    I tried to find a solution to make gcc happy, but could not find anything
+    that would not require a lot of extra code that would be harder to manage
+    than the current code.
+  */
+  return select_lex->join->change_result(res);
 }
 
 

sql/sql_string.h

@@ -457,8 +457,9 @@ public:
   }
 };
 
-static inline bool check_if_only_end_space(CHARSET_INFO *cs, char *str, 
-                                           char *end)
+static inline bool check_if_only_end_space(CHARSET_INFO *cs,
+                                           const char *str, 
+                                           const char *end)
 {
   return str+ cs->cset->scan(cs, str, end, MY_SEQ_SPACES) == end;
 }

storage/heap/hp_test2.c

@@ -21,9 +21,6 @@
 #ifdef DBUG_OFF
 #undef DBUG_OFF
 #endif
-#ifndef SAFEMALLOC
-#define SAFEMALLOC
-#endif
 
 #include "heapdef.h"		/* Because of hp_find_block */
 #include <signal.h>
@@ -319,7 +316,8 @@ int main(int argc, char *argv[])
     if (!silent)
       printf("- Read last key - delete - prev - prev - opt_delete - prev -> first\n");
 
-    if (heap_rlast(file,record3,0)) goto err;
+    if (heap_rprev(file,record))
+      goto err;
     if (heap_delete(file,record3)) goto err;
     key_check-=atoi((char*) record3);
     key1[atoi((char*) record+keyinfo[0].seg[0].start)]--;
@@ -526,7 +524,7 @@ int main(int argc, char *argv[])
   }
 
   ant=0;
-  for (error=heap_rlast(file,record,0) ;
+  for (error=heap_rprev(file,record) ;
       ! error ;
       error=heap_rprev(file,record))
   {