Make maria_data_root const char*

This allow one to remove some casts like:
maria_data_root= (char *)".";

It also removes warnings from icc.

include/mysql/plugin.h

@@ -313,6 +313,12 @@ typedef void (*mysql_var_update_func)(MYSQL_THD thd,
   const type def_val;                 \
 } MYSQL_SYSVAR_NAME(name)
 
+#define DECLARE_MYSQL_SYSVAR_CONST_BASIC(name, type) struct { \
+  MYSQL_PLUGIN_VAR_HEADER;      \
+  const type *value;                  \
+  const type def_val;                 \
+} MYSQL_SYSVAR_NAME(name)
+
 #define DECLARE_MYSQL_SYSVAR_SIMPLE(name, type) struct { \
   MYSQL_PLUGIN_VAR_HEADER;      \
   type *value; type def_val;    \
@@ -367,6 +373,11 @@ DECLARE_MYSQL_SYSVAR_BASIC(name, char *) = { \
   PLUGIN_VAR_STR | ((opt) & PLUGIN_VAR_MASK), \
   #name, comment, check, update, &varname, def}
 
+#define MYSQL_SYSVAR_CONST_STR(name, varname, opt, comment, check, update, def) \
+DECLARE_MYSQL_SYSVAR_CONST_BASIC(name, char *) = { \
+  PLUGIN_VAR_STR | ((opt) & PLUGIN_VAR_MASK), \
+  #name, comment, check, update, &varname, def}
+
 #define MYSQL_SYSVAR_INT(name, varname, opt, comment, check, update, def, min, max, blk) \
 DECLARE_MYSQL_SYSVAR_SIMPLE(name, int) = { \
   PLUGIN_VAR_INT | ((opt) & PLUGIN_VAR_MASK), \

storage/maria/aria_chk.c

@@ -128,7 +128,7 @@ int main(int argc, char **argv)
   MY_INIT(argv[0]);
 
   my_setup_stacktrace();
-  default_log_dir= opt_log_dir= maria_data_root= (char *)".";
+  default_log_dir= opt_log_dir= maria_data_root= ".";
   maria_chk_init(&check_param);
   check_param.opt_lock_memory= 1;		/* Lock memory if possible */
   check_param.using_global_keycache = 0;
@@ -322,7 +322,7 @@ static struct my_option my_long_options[] =
    0, GET_ULL, REQUIRED_ARG, -1, 0, 0, 0, 0, 0},
   {"datadir", 'h',
    "Path for control file (and logs if --logdir not used).",
-   &maria_data_root, 0, 0, GET_STR, REQUIRED_ARG,
+   (char**) &maria_data_root, 0, 0, GET_STR, REQUIRED_ARG,
    0, 0, 0, 0, 0, 0},
   {"logdir", OPT_LOG_DIR,
    "Path for log files.",

storage/maria/aria_dump_log.c

@@ -143,7 +143,7 @@ int main(int argc, char **argv)
     translog_table_init();
   translog_fill_overhead_table();
 
-  maria_data_root= (char *)".";
+  maria_data_root= ".";
 
   if ((handler= my_open(opt_file, O_RDONLY, MYF(MY_WME))) < 0)
   {

storage/maria/aria_pack.c

@@ -229,7 +229,7 @@ int main(int argc, char **argv)
   my_bool no_control_file= 0;
   MY_INIT(argv[0]);
 
-  maria_data_root= (char *)".";
+  maria_data_root= ".";
   load_defaults_or_exit("my", load_default_groups, &argc, &argv);
   default_argv= argv;
   get_options(&argc,&argv);
@@ -316,7 +316,7 @@ static struct my_option my_long_options[] =
    (char**) &charsets_dir, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"datadir", 'h',
    "Path for control file (and logs if --logdir not used).",
-   &maria_data_root, 0, 0, GET_STR, REQUIRED_ARG,
+   (char**) &maria_data_root, 0, 0, GET_STR, REQUIRED_ARG,
    0, 0, 0, 0, 0, 0},
   {"debug", '#', "Output debug log. Often this is 'd:t:o,filename'.",
    0, 0, 0, GET_STR, OPT_ARG, 0, 0, 0, 0, 0, 0},

storage/maria/aria_read_log.c

@@ -83,7 +83,7 @@ int main(int argc, char **argv)
   uint warnings_count;
   MY_INIT(argv[0]);
 
-  maria_data_root= (char *)".";
+  maria_data_root= ".";
   sf_leaking_memory=1; /* don't report memory leaks on early exits */
   load_defaults_or_exit("my", load_default_groups, &argc, &argv);
   default_argv= argv;
@@ -248,7 +248,7 @@ static struct my_option my_long_options[] =
     0, 0, 0, 0 },
   {"aria-log-dir-path", 'h',
     "Path to the directory where to store transactional log",
-    (uchar **) &maria_data_root, (uchar **) &maria_data_root, 0,
+    (char **) &maria_data_root, (char **) &maria_data_root, 0,
     GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   { "page-buffer-size", 'P',
     "The size of the buffer used for index blocks for Aria tables",

storage/maria/ha_maria.cc

@@ -187,12 +187,11 @@ static MYSQL_SYSVAR_BOOL(page_checksum, maria_page_checksums, 0,
        "with PAGE_CHECKSUM clause in CREATE TABLE)", 0, 0, 1);
 
 /* It is only command line argument */
-static MYSQL_SYSVAR_STR(log_dir_path, maria_data_root,
+static MYSQL_SYSVAR_CONST_STR(log_dir_path, maria_data_root,
        PLUGIN_VAR_NOSYSVAR | PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
        "Path to the directory where to store transactional log",
        NULL, NULL, mysql_real_data_home);
 
-
 static MYSQL_SYSVAR_ULONG(log_file_size, log_file_size,
        PLUGIN_VAR_RQCMDARG,
        "Limit for transaction log size",

storage/maria/ma_rt_test.c

@@ -95,7 +95,7 @@ int main(int argc, char *argv[])
 {
   char buff[FN_REFLEN];  
   MY_INIT(argv[0]);
-  maria_data_root= (char *)".";
+  maria_data_root= ".";
   get_options(argc, argv);
   /* Maria requires that we always have a page cache */
   if (maria_init() ||
@@ -616,8 +616,8 @@ static struct my_option my_long_options[] =
 #endif
   {"help", '?', "Display help and exit",
    0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
-  {"datadir", 'h', "Path to the database root.", &maria_data_root,
+  {"datadir", 'h', "Path to the database root.", (char**) &maria_data_root,
-   &maria_data_root, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+   (char**) &maria_data_root, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"row-fixed-size", 'S', "Fixed size records",
    0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
   {"rows-in-block", 'M', "Store rows in block format",

storage/maria/ma_static.c

@@ -62,7 +62,7 @@ PAGECACHE *maria_pagecache= &maria_pagecache_var;
 PAGECACHE maria_log_pagecache_var;
 PAGECACHE *maria_log_pagecache= &maria_log_pagecache_var;
 MY_TMPDIR *maria_tmpdir;                        /* Tempdir for redo */
-char *maria_data_root;
+const char *maria_data_root;
 HASH maria_stored_state;
 int (*maria_create_trn_hook)(MARIA_HA *);
 

storage/maria/ma_test1.c

@@ -25,7 +25,7 @@
 #include "trnman.h"
 
 extern PAGECACHE *maria_log_pagecache;
-extern char *maria_data_root;
+extern const char *maria_data_root;
 
 #define MAX_REC_LENGTH 1024
 
@@ -75,7 +75,7 @@ int main(int argc,char *argv[])
   safe_mutex_deadlock_detector= 1;
 #endif
   MY_INIT(argv[0]);
-  maria_data_root= (char *)".";
+  maria_data_root= ".";
   get_options(argc,argv);
   /* Maria requires that we always have a page cache */
   if (maria_init() ||
@@ -739,8 +739,8 @@ static struct my_option my_long_options[] =
   {"debug", '#', "Undocumented",
    0, 0, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
 #endif
-  {"datadir", 'h', "Path to the database root.", &maria_data_root,
+  {"datadir", 'h', "Path to the database root.", (char**) &maria_data_root,
-   &maria_data_root, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+   (char**) &maria_data_root, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"delete-rows", 'd', "Abort after this many rows has been deleted",
    (uchar**) &remove_count, (uchar**) &remove_count, 0, GET_UINT, REQUIRED_ARG,
    1000, 0, 0, 0, 0, 0},

storage/maria/ma_test2.c

@@ -76,7 +76,7 @@ int main(int argc, char *argv[])
 #endif
   MY_INIT(argv[0]);
 
-  maria_data_root= (char *)".";
+  maria_data_root= ".";
   get_options(argc,argv);
   fn_format(filename, "test2", maria_data_root, "", MYF(0));
 

storage/maria/maria_def.h

@@ -1238,7 +1238,7 @@ extern uchar maria_file_magic[], maria_pack_file_magic[];
 extern uchar maria_uuid[MY_UUID_SIZE];
 extern uint32 maria_read_vec[], maria_readnext_vec[];
 extern uint maria_quick_table_bits;
-extern char *maria_data_root;
+extern const char *maria_data_root;
 extern uchar maria_zero_string[];
 extern my_bool maria_inited, maria_in_ha_maria, maria_recovery_changed_data;
 extern my_bool maria_recovery_verbose, maria_checkpoint_disabled;

storage/maria/test_ma_backup.c

@@ -41,7 +41,7 @@ int main(int argc __attribute__((unused)), char *argv[])
   safe_mutex_deadlock_detector= 1;
 #endif
   MY_INIT(argv[0]);
-  maria_data_root= (char *)".";
+  maria_data_root= ".";
 
   /* Maria requires that we always have a page cache */
   if (maria_init() ||