GHDL --STD=08 elaborate klappt nicht

[Martin O. (ossi-2)]

Ich will das folgende "Programm" unter GHDL laufen lassen.

library STD;                            -- you don't need STD, it is automatic
library IEEE;                           -- but may need other libraries
use IEEE.std_logic_1164.all;            -- basic logic types
use STD.textio.all;                     -- basic I/O
use IEEE.std_logic_textio.all;          -- I/O for logic types

entity hello_world is 
end entity hello_world;

architecture test of hello_world is -- where declarations are placed
  subtype word_32 is std_logic_vector(31 downto 0);  -- simple name
  signal four_32 : word_32 := x"00000AB4";           -- just four in hex
  signal I : integer := 0;  

begin
  my_print : process is                  -- a process is parallel
               variable my_line : line;  -- type 'line' comes from textio
             begin
             L1: for I in 2 to 5 loop
               write(my_line, string'("Hello World 1"));   -- formatting
               writeline(output, my_line);               -- write to "output"
         
               write(my_line, string'("four_32 = "));   
               hwrite(my_line, four_32); -- format type std_logic_vector as hex
         
               write(my_line, string'("  I= ")); write(my_line, I);  -- format 'counter' as integer
               wait for 10 ns ;
               write(my_line, string'(" at time ")); write(my_line, now);                     -- format time
               writeline(output, my_line);              -- write to display
             end loop L1;
               wait;
             end process my_print;
end architecture test;

Da ich "hwrite" verwende muss ich zum compilieren die IEEE Version 08 
verwenden. Mein Aufruf:

ghdl -a --std=08  *.vhd

Danach funktioniert "elaborate" oder "run" nicht

ghdl -e hello_world

Fehler: cannot find entity or configuration hello_world

Hat einer ne Idee was ich falsch mache? Ohne "hwrite" und "std=08" 
klappt alles.

[Georg A. (georga)]

Brauchts das std evtl. beim Elaborieren auch?