*
* This layout is not as flexible as the pattern one
*/
-XBT_PUBLIC xbt_log_layout_t xbt_log_layout_simple_new(char* arg);
-XBT_PUBLIC xbt_log_layout_t xbt_log_layout_format_new(char* arg);
-XBT_PUBLIC xbt_log_appender_t xbt_log_appender_file_new(char* arg);
-XBT_PUBLIC xbt_log_appender_t xbt_log_appender2_file_new(char* arg, int roll);
+XBT_PUBLIC xbt_log_layout_t xbt_log_layout_simple_new(const char* arg);
+XBT_PUBLIC xbt_log_layout_t xbt_log_layout_format_new(const char* arg);
+XBT_PUBLIC xbt_log_appender_t xbt_log_appender_file_new(const char* arg);
+XBT_PUBLIC xbt_log_appender_t xbt_log_appender2_file_new(const char* arg, int roll);
/* ********************************** */
/* Functions that you shouldn't call */