BUG#11754894: MYISAMCHK ERROR HAS INCORRECT REFERENCE

              TO 'MYISAM_SORT_BUFFER_SIZE'
Problem: 'myisam_sort_buffer_size' is a parameter used by 
mysqld program only whereas 'sort_buffer_size' is used by
mysqld and myisamchk programs. But the error message printed
when myisamchk program is run with insufficient buffer size 
is myisam_sort_buffer_size is too small which may mislead to the
server parameter myisam_sort_buffer_size.
SOLUTION: A parameter 'myisam_sort_buffer_size' is added as an
alias for 'sort_buffer_size' and the 'sort_buffer_size' parameter
is marked as deprecated. So myisamchk also has both the parameters
with the same role.

storage/myisam/myisamchk.c

@@ -310,7 +310,14 @@ static struct my_option my_long_options[] =
     &check_param.write_buffer_length, 0, GET_ULONG, REQUIRED_ARG,
     (long) READ_BUFFER_INIT, (long) MALLOC_OVERHEAD,
     INT_MAX32, (long) MALLOC_OVERHEAD, (long) 1L, 0},
-  { "sort_buffer_size", OPT_SORT_BUFFER_SIZE, "",
+  { "sort_buffer_size", OPT_SORT_BUFFER_SIZE, 
+    "Deprecated. myisam_sort_buffer_size alias is being used",
+    &check_param.sort_buffer_length,
+    &check_param.sort_buffer_length, 0, GET_ULONG, REQUIRED_ARG,
+    (long) SORT_BUFFER_INIT, (long) (MIN_SORT_BUFFER + MALLOC_OVERHEAD),
+    ULONG_MAX, (long) MALLOC_OVERHEAD, (long) 1L, 0},
+  { "myisam_sort_buffer_size", OPT_SORT_BUFFER_SIZE, 
+    "Alias of sort_buffer_size parameter",
     &check_param.sort_buffer_length,
     &check_param.sort_buffer_length, 0, GET_ULONG, REQUIRED_ARG,
     (long) SORT_BUFFER_INIT, (long) (MIN_SORT_BUFFER + MALLOC_OVERHEAD),