$gcov_error = system_no_output(1, $gcov_tool, $da_filename, "-o", 
$object_dir, "-b");

sub system_no_output($@)
{
	my $mode = shift;
	my $result;
	local *OLD_STDERR;
	local *OLD_STDOUT;

	# Save old stdout and stderr handles
	($mode & 1) && open(OLD_STDOUT, ">>&STDOUT");
	($mode & 2) && open(OLD_STDERR, ">>&STDERR");

	# Redirect to /dev/null
	($mode & 1) && open(STDOUT, ">/dev/null");
	($mode & 2) && open(STDERR, ">/dev/null");
 
	system(@_);
	$result = $?;

	# Close redirected handles
	($mode & 1) && close(STDOUT);
	($mode & 2) && close(STDERR);

	# Restore old handles
	($mode & 1) && open(STDOUT, ">>&OLD_STDOUT");
	($mode & 2) && open(STDERR, ">>&OLD_STDERR");
 
	return $result;
}