I have installed ghdl in Ubuntu 10.10 (using apt-get from the repository) and used the hello_world example available in the ghdl manual. I can analyze (-a) and elaborate (-e) successfully but when I try to run/execute (-r) it, I get the following error:
/usr/lib/ghdl/bin/ghdl: compilation error
To elaborate my problem, I have mentioned the vhdl code at the end and the sequence of commands that I follow below:
$ ghdl -a hello.vhdl
$ ghdl -e hello_world
$ ./hello_world
bash: ./hello_world: Permission denied
$ ghdl -r hello_world
/usr/lib/ghdl/bin/ghdl: compilation error
I have tried working as root too but without success. The permissions are perfect, the execute bit is set. Everything seems to be fine, but still it doesnt work. I have even tried reinstalling the ghdl package.
Can someone please tell me what could be the source of problem?
Thanks in advance.
hello.vhdl (Vhdl code)
-- Hello world program.
use std.textio.all; -- Imports the standard textio package.
-- Defines a design entity, without any ports.
entity hello_world is
end hello_world;
architecture behaviour of hello_world is
begin
process
variable l : line;
begin
write (l, String'("Hello world!"));
writeline (output, l);
wait;
end process;
end behaviour;
