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--
-- <alias_bug.vhd>
--
-- Illustrates GHDL 0.29.1 WinXP problem with attributes and aliases
--
-- Problem:
-- A signal attribute, placed after an alias on the signal, causes errors like this:
--
-- .\alias_bug.vhd:35:13: alias "address_ms" does not denote the entire object
--
--
-- Workaround: move the attribute before the alias
--
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity alias_bug is
end alias_bug;
architecture test of alias_bug is
signal processor_address : std_logic_vector(15 downto 0);
--
-- if alias is _NOT_ declared, error goes away
--
alias address_ms : std_logic_vector(3 downto 0) is processor_address(15 downto 12);
--
-- if the keep attribute is placed _BEFORE_ the alias, no error occurs
--
attribute keep : boolean;
attribute keep of processor_address: signal is TRUE;
begin
processor_address <= X"1234";
end test;
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