Bug#58057: 5.1 libmysql/libmysql.c unused variable/compile failure

Bug#57995: Compiler flag change build error on OSX 10.4: my_getncpus.c
Bug#57996: Compiler flag change build error on OSX 10.5 : bind.c
Bug#57994: Compiler flag change build error : my_redel.c
Bug#57993: Compiler flag change build error on FreeBsd 7.0 : regexec.c
Bug#57992: Compiler flag change build error on FreeBsd : mf_keycache.c
Bug#57997: Compiler flag change build error on OSX 10.6: debug_sync.cc

Fix assorted compiler generated warnings.

cmd-line-utils/readline/bind.c:
  Bug#57996: Compiler flag change build error on OSX 10.5 : bind.c
  
  Initialize variable to work around a false positive warning.
include/m_string.h:
  Bug#57994: Compiler flag change build error : my_redel.c
  
  The expansion of stpcpy (in glibc) causes warnings if the
  return value of strmov is not being used. Since stpcpy is
  a GNU extension and the expansion ends up using a built-in
  provided by GCC, use the compiler provided built-in directly
  when possible.
include/my_compiler.h:
  Define a dummy MY_GNUC_PREREQ when not compiling with GCC.
libmysql/libmysql.c:
  Bug#58057: 5.1 libmysql/libmysql.c unused variable/compile failure
  
  Variable might not be used in some cases. So, tag it as unused.
mysys/mf_keycache.c:
  Bug#57992: Compiler flag change build error on FreeBsd : mf_keycache.c
  
  Use UNINIT_VAR to work around a false positive warning.
mysys/my_getncpus.c:
  Bug#57995: Compiler flag change build error on OSX 10.4: my_getncpus.c
  
  Declare variable in the same block where it is used.
regex/regexec.c:
  Bug#57993: Compiler flag change build error on FreeBsd 7.0 : regexec.c
  
  Work around a compiler bug which causes the cast to not be enforced.
sql/debug_sync.cc:
  Bug#57997: Compiler flag change build error on OSX 10.6: debug_sync.cc
  
  Use UNINIT_VAR to work around a false positive warning.
sql/handler.cc:
  Use UNINIT_VAR to work around a false positive warning.
sql/slave.cc:
  Use UNINIT_VAR to work around a false positive warning.
sql/sql_partition.cc:
  Use UNINIT_VAR to work around a false positive warning.
storage/myisam/ft_nlq_search.c:
  Use UNINIT_VAR to work around a false positive warning.
storage/myisam/mi_create.c:
  Use UNINIT_VAR to work around a false positive warning.
storage/myisammrg/myrg_open.c:
  Use UNINIT_VAR to work around a false positive warning.
tests/mysql_client_test.c:
  Change function to take a pointer to const, no need for a cast.

cmd-line-utils/readline/bind.c

@@ -855,7 +855,7 @@ _rl_read_init_file (filename, include_level)
 {
   register int i;
   char *buffer, *openname, *line, *end;
-  size_t file_size;
+  size_t file_size = 0;
 
   current_readline_init_file = filename;
   current_readline_init_include_level = include_level;

include/m_string.h

@@ -73,7 +73,9 @@ extern "C" {
 extern void *(*my_str_malloc)(size_t);
 extern void (*my_str_free)(void *);
 
-#if defined(HAVE_STPCPY)
+#if MY_GNUC_PREREQ(3, 4)
+#define strmov(dest, src) __builtin_stpcpy(dest, src)
+#elif defined(HAVE_STPCPY)
 #define strmov(A,B) stpcpy((A),(B))
 #ifndef stpcpy
 extern char *stpcpy(char *, const char *);	/* For AIX with gcc 2.95.3 */

include/my_compiler.h

@@ -76,6 +76,11 @@
 /**
   Generic (compiler-independent) features.
 */
+
+#ifndef MY_GNUC_PREREQ
+# define MY_GNUC_PREREQ(maj, min) (0)
+#endif
+
 #ifndef MY_ALIGNOF
 # ifdef __cplusplus
     template<typename type> struct my_alignof_helper { char m1; type m2; };

libmysql/libmysql.c

@@ -131,8 +131,8 @@ int STDCALL mysql_server_init(int argc __attribute__((unused)),
       mysql_port = MYSQL_PORT;
 #ifndef MSDOS
       {
-	struct servent *serv_ptr;
-	char	*env;
+        char *env;
+        struct servent *serv_ptr __attribute__((unused));
 
         /*
           if builder specifically requested a default port, use that

mysys/mf_keycache.c

@@ -3917,11 +3917,11 @@ restart:
             if (!(block->status & (BLOCK_IN_EVICTION | BLOCK_IN_SWITCH |
                                    BLOCK_REASSIGNED)))
             {
-              struct st_hash_link *next_hash_link;
-              my_off_t            next_diskpos;
-              File                next_file;
-              uint                next_status;
-              uint                hash_requests;
+              struct st_hash_link *UNINIT_VAR(next_hash_link);
+              my_off_t UNINIT_VAR(next_diskpos);
+              File UNINIT_VAR(next_file);
+              uint UNINIT_VAR(next_status);
+              uint UNINIT_VAR(hash_requests);
 
               total_found++;
               found++;

mysys/my_getncpus.c

@@ -18,9 +18,10 @@
 #include "mysys_priv.h"
 #include <unistd.h>
 
+#ifdef _SC_NPROCESSORS_ONLN
+
 static int ncpus=0;
 
-#ifdef _SC_NPROCESSORS_ONLN
 int my_getncpus()
 {
   if (!ncpus)

regex/regexec.c

@@ -117,6 +117,7 @@ size_t nmatch;
 my_regmatch_t pmatch[];
 int eflags;
 {
+	char *pstr = (char *) str;
 	register struct re_guts *g = preg->re_g;
 #ifdef REDEBUG
 #	define	GOODFLAGS(f)	(f)
@@ -133,7 +134,7 @@ int eflags;
 
 	if ((size_t) g->nstates <= CHAR_BIT*sizeof(states1) &&
 	    !(eflags&REG_LARGE))
-		return(smatcher(preg->charset, g, (char *)str, nmatch, pmatch, eflags));
+		return(smatcher(preg->charset, g, pstr, nmatch, pmatch, eflags));
 	else
-		return(lmatcher(preg->charset, g, (char *)str, nmatch, pmatch, eflags));
+		return(lmatcher(preg->charset, g, pstr, nmatch, pmatch, eflags));
 }

sql/debug_sync.cc

@@ -1718,7 +1718,7 @@ static void debug_sync_execute(THD *thd, st_debug_sync_action *action)
 
   if (action->execute)
   {
-    const char  *old_proc_info;
+    const char *UNINIT_VAR(old_proc_info);
 
     action->execute--;
 

sql/handler.cc

@@ -4141,7 +4141,7 @@ int handler::read_multi_range_first(KEY_MULTI_RANGE **found_range_p,
 */
 int handler::read_multi_range_next(KEY_MULTI_RANGE **found_range_p)
 {
-  int result;
+  int UNINIT_VAR(result);
   DBUG_ENTER("handler::read_multi_range_next");
 
   /* We should not be called after the last call returned EOF. */

sql/slave.cc

@@ -2321,7 +2321,7 @@ static int exec_relay_log_event(THD* thd, Relay_log_info* rli)
 
     if (slave_trans_retries)
     {
-      int temp_err;
+      int UNINIT_VAR(temp_err);
       if (exec_res && (temp_err= has_temporary_error(thd)))
       {
         const char *errmsg;

sql/sql_partition.cc

@@ -6747,8 +6747,8 @@ int get_part_iter_for_interval_via_mapping(partition_info *part_info,
 {
   DBUG_ASSERT(!is_subpart);
   Field *field= part_info->part_field_array[0];
-  uint32             max_endpoint_val;
-  get_endpoint_func  get_endpoint;
+  uint32             UNINIT_VAR(max_endpoint_val);
+  get_endpoint_func  UNINIT_VAR(get_endpoint);
   bool               can_match_multiple_values;  /* is not '=' */
   uint field_len= field->pack_length_in_rec();
   part_iter->ret_null_part= part_iter->ret_null_part_orig= FALSE;

storage/myisam/ft_nlq_search.c

@@ -63,7 +63,7 @@ static int FT_SUPERDOC_cmp(void* cmp_arg __attribute__((unused)),
 
 static int walk_and_match(FT_WORD *word, uint32 count, ALL_IN_ONE *aio)
 {
-  int	       subkeys, r;
+  int	       UNINIT_VAR(subkeys), r;
   uint	       keylen, doc_cnt;
   FT_SUPERDOC  sdoc, *sptr;
   TREE_ELEMENT *selem;

storage/myisam/mi_create.c

@@ -38,7 +38,7 @@ int mi_create(const char *name,uint keys,MI_KEYDEF *keydefs,
 	      MI_CREATE_INFO *ci,uint flags)
 {
   register uint i,j;
-  File UNINIT_VAR(dfile),file;
+  File UNINIT_VAR(dfile), UNINIT_VAR(file);
   int errpos,save_errno, create_mode= O_RDWR | O_TRUNC;
   myf create_flag;
   uint fields,length,max_key_length,packed,pointer,real_length_diff,
@@ -73,8 +73,6 @@ int mi_create(const char *name,uint keys,MI_KEYDEF *keydefs,
   {
     DBUG_RETURN(my_errno=HA_WRONG_CREATE_OPTION);
   }
-  LINT_INIT(dfile);
-  LINT_INIT(file);
   errpos=0;
   options=0;
   bzero((uchar*) &share,sizeof(share));

storage/myisammrg/myrg_open.c

@@ -221,7 +221,7 @@ MYRG_INFO *myrg_parent_open(const char *parent_name,
                             int (*callback)(void*, const char*),
                             void *callback_param)
 {
-  MYRG_INFO *m_info;
+  MYRG_INFO *UNINIT_VAR(m_info);
   int       rc;
   int       errpos;
   int       save_errno;

tests/mysql_client_test.c

@@ -1175,7 +1175,7 @@ my_bool fetch_n(const char **query_list, unsigned query_count,
 
 /* Separate thread query to test some cases */
 
-static my_bool thread_query(char *query)
+static my_bool thread_query(const char *query)
 {
   MYSQL *l_mysql;
   my_bool error;
@@ -1197,7 +1197,7 @@ static my_bool thread_query(char *query)
     goto end;
   }
   l_mysql->reconnect= 1;
-  if (mysql_query(l_mysql, (char *)query))
+  if (mysql_query(l_mysql, query))
   {
      fprintf(stderr, "Query failed (%s)\n", mysql_error(l_mysql));
      error= 1;
@@ -5821,7 +5821,7 @@ static void test_prepare_alter()
   rc= mysql_stmt_execute(stmt);
   check_execute(stmt, rc);
 
-  if (thread_query((char *)"ALTER TABLE test_prep_alter change id id_new varchar(20)"))
+  if (thread_query("ALTER TABLE test_prep_alter change id id_new varchar(20)"))
     exit(1);
 
   is_null= 1;