Minor fixes to get rid of the spurious gcc warnings

 /* GNU Mailutils -- a suite of utilities for electronic mail
-   Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -616,7 +616,7 @@ mu_sql_authenticate (struct mu_auth_data **return_data ARG_UNUSED,
 		     const void *key,
 		     void *func_data ARG_UNUSED, void *call_data)
 {
-  struct mu_auth_data *auth_data = key;
+  const struct mu_auth_data *auth_data = key;
   char *pass = call_data;
   char *sql_pass;
   int rc;

@@ -125,7 +125,7 @@ mu_sieve_get_message_sender (mu_message_t msg, char **ptext)
     {
       mu_header_t hdr = NULL;
       mu_message_get_header (msg, &hdr);
-      if (rc = mu_header_aget_value (hdr, MU_HEADER_SENDER, &text))
+      if ((rc = mu_header_aget_value (hdr, MU_HEADER_SENDER, &text)))
 	rc = mu_header_aget_value (hdr, MU_HEADER_FROM, &text);
     }
 

@@ -64,7 +64,7 @@ build_mime (mu_sieve_machine_t mach, mu_list_t tags, mu_mime_t *pmime,
   mu_message_get_body (newmsg, &body);
   mu_body_get_stream (body, &stream);
 
-  if (rc = mu_memory_stream_create (&input, 0, MU_STREAM_RDWR))
+  if ((rc = mu_memory_stream_create (&input, 0, MU_STREAM_RDWR)))
     {
       mu_sieve_error (mach,
 		      _("cannot create temporary stream: %s"),
@@ -72,7 +72,7 @@ build_mime (mu_sieve_machine_t mach, mu_list_t tags, mu_mime_t *pmime,
       return 1;
     }
 
-  if (rc = mu_stream_open (input))
+  if ((rc = mu_stream_open (input)))
     {
       mu_sieve_error (mach,
 		      _("cannot open temporary stream: %s"),

 /* GNU Mailutils -- a suite of utilities for electronic mail
    Copyright (C) 1999, 2000, 2001, 2002, 2004, 
-   2005 Free Software Foundation, Inc.
+   2005, 2006 Free Software Foundation, Inc.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -84,7 +84,7 @@ sieve_code_number (long num)
 }
 
 int
-sieve_code_string (char *string)
+sieve_code_string (const char *string)
 {
   sieve_op_t op;
 

 /* GNU Mailutils -- a suite of utilities for electronic mail
-   Copyright (C) 1999, 2000, 2001, 2002, 2005 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2000, 2001, 2002, 2005, 2006 Free Software Foundation, Inc.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -31,7 +31,7 @@ typedef union {
   mu_sieve_value_t *val;
   mu_list_t list;
   long number;
-  char *string;
+  const char *string;
   size_t pc;
   size_t line;
 } sieve_op_t;
@@ -59,7 +59,7 @@ struct sieve_machine {
 
   int debug_level;           /* Debugging level */
   jmp_buf errbuf;            /* Target location for non-local exits */
-  char *identifier;          /* Name of action or test being executed */
+  const char *identifier;    /* Name of action or test being executed */
   
   mu_mailbox_t mailbox;      /* Mailbox to operate upon */
   size_t    msgno;           /* Current message number */

@@ -240,7 +240,7 @@ push_source (const char *name)
       yyerror (_("recursive inclusion"));
       return 1;
     }
-  if (ctx = ctx_lookup (st.st_ino))
+  if ((ctx = ctx_lookup (st.st_ino)))
     {
       yyerror (_("recursive inclusion"));
       if (ctx->prev)

 /* GNU Mailutils -- a suite of utilities for electronic mail
-   Copyright (C) 1999, 2001, 2002, 2005 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2001, 2002, 2005, 2006 Free Software Foundation, Inc.
 
    GNU Mailutils is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -187,7 +187,7 @@ escape_shell (int argc, char **argv, compose_env_t *env)
 int
 escape_command (int argc, char **argv, compose_env_t *env)
 {
-  struct mail_command_entry *entry;
+  const struct mail_command_entry *entry;
   int status;
 
   if (escape_check_args (argc, argv))

@@ -209,7 +209,7 @@ argcv_unquote_copy (char *dst, const char *src, size_t n)
 	case '"':
 	  if (!expect_delim)
 	    {
-	      char *p;
+	      const char *p;
 	      
 	      for (p = src+i+1; *p && *p != src[i]; p++)
 		if (*p == '\\')

@@ -582,8 +582,8 @@ mu_temp_file_stream_create (mu_stream_t *stream, const char *dir)
   fs->tempfile = 1;
 
   if (!dir)
-    fs->filename = dir;
-  else if ((fs->filename = strdup(dir)) == NULL)
+    fs->filename = NULL;
+  else if ((fs->filename = strdup (dir)) == NULL)
     {
       free (fs);
       return ENOMEM;

 /* GNU Mailutils -- a suite of utilities for electronic mail
-   Copyright (C) 1999, 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
+   Copyright (C) 1999, 2000, 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -31,7 +31,7 @@
 static regex_t *re_prefix;
 
 int
-mu_unre_set_regex (char *str, int caseflag, char **errp)
+mu_unre_set_regex (const char *str, int caseflag, char **errp)
 {
   int rc;
   int flags = REG_EXTENDED;

@@ -1350,7 +1350,7 @@ char *
 __argp_base_name (const char *arg)
 {
   char *p = strrchr (arg, '/');
-  return p ? p + 1 : arg;
+  return (char *)(p ? p + 1 : arg);
 }
 
 /* A locale-independent version of strftime */

@@ -255,7 +255,7 @@ push_source (const char *name, int fail)
       free (filename);
       return 1;
     }
-  if (ctx = ctx_lookup (st.st_ino))
+  if ((ctx = ctx_lookup (st.st_ino)))
     {
       ali_parse_error (_("recursive inclusion"));
       if (ctx->prev)

@@ -359,7 +359,6 @@ mh_alias_get_address (char *name, mu_address_t *paddr, int *incl)
 {
   mu_iterator_t itr;
   mu_list_t list;
-  const char *domain = NULL;
 
   if (incl)
     *incl = 0;

@@ -564,7 +564,7 @@ mh_spawnp (const char *prog, const char *file)
   xargv[i++] = (char*) file;
   xargv[i++] = NULL;
 
-  rc = mu_spawnvp (xargv[0], (const char**) xargv, &status);
+  rc = mu_spawnvp (xargv[0], xargv, &status);
 
   free (xargv);
   mu_argcv_free (argc, argv);

@@ -265,7 +265,7 @@ invoke (char *compname, char *defval, int argc, char **argv,
   if (extra1)
     xargv[i++] = extra1;
   xargv[i++] = NULL;
-  rc = mu_spawnvp (xargv[0], (const char **) xargv, &status);
+  rc = mu_spawnvp (xargv[0], xargv, &status);
   free (xargv);
   return rc ? rc : check_exit_status (progname, status);
 }

@@ -105,7 +105,7 @@ mh_alias_expand (char *str, mu_address_t *paddr, int *incl)
     {
       int status;
       mu_argcv_string (argc, argv, &buf);
-      if (status = mu_address_create (paddr, buf))
+      if ((status = mu_address_create (paddr, buf)))
 	mu_error (_("Bad address `%s': %s"), buf, mu_strerror (status));
       free (buf);
     }

@@ -1623,7 +1623,8 @@ store_handler (mu_message_t msg, msg_part_t part, char *type, char *encoding,
 	    }
 
 	  if (!name
-	      && mu_header_aget_value (hdr, MU_HEADER_CONTENT_TYPE, &val) == 0) {
+	      && mu_header_aget_value (hdr, MU_HEADER_CONTENT_TYPE, &val) == 0)
+	    {
 	      if (mu_argcv_get (val, "=", NULL, &argc, &argv) == 0)
 		{
 		  int i;

 /* GNU Mailutils -- a suite of utilities for electronic mail
-   Copyright (C) 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc.
 
    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
@@ -48,6 +48,8 @@ init_disptab ()
   return 0;
 }
 
+/* FIXME: See comment 'For dynamic loading' below */
+#if 0
 static int
 add_disptab (mu_sql_dispatch_t *tab)
 {
@@ -64,6 +66,7 @@ add_disptab (mu_sql_dispatch_t *tab)
   sql_disptab[sql_disptab_next] = tab;
   return sql_disptab_next++;
 }
+#endif
 
 int
 mu_sql_interface_index (char *name)
@@ -75,9 +78,10 @@ mu_sql_interface_index (char *name)
   for (i = 1; i < sql_disptab_next; i++)
     if (sql_disptab[i] && (!name || strcmp (sql_disptab[i]->name, name) == 0))
       return i;
-  // FIXME
-  //  if (name && mu_sql_load_ext (name, "dispatch_tab", &tab))
-  //  return add_disptab (tab);
+  /* FIXME: For dynamic loading
+      if (name && mu_sql_load_ext (name, "dispatch_tab", &tab))
+       return add_disptab (tab);
+  */  
   return 0;
 }