Problems with gcov

Hello,

i`m trying to use the gcov tool to measure the code coverage of my ada-
code, but it seems no to work.
I tried to measure the following code: (helloworld.adb)

with Ada.Text_IO;
use Ada.Text_IO;
procedure helloworld is
begin
Put_Line("Hello World");
end helloworld;

The next steps are:

% gnatmake -fprofile-arcs -ftest-coverage helloworld.adb
gnatgcc -c -fprofile-arcs -ftest-coverage helloworld.adb
gnatbind -x helloworld.ali
gnatlink helloworld.ali

% ls
helloworld helloworld.adb helloworld.ali helloworld.bb
helloworld.bbg helloworld.o

% ./helloworld
Hello World

% ls
helloworld helloworld.adb helloworld.ali helloworld.bb
helloworld.bbg helloworld.o


There is no helloworld.gcno file.
What am i doing wrong.

Thanks

flux

.