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my $gcov_tool   = 'gcov';
my $da_filename = 'c:/path/to/file.gcda';
...

$gcov_error = system_no_output(0, 'echo', $gcov_tool, $da_filename, "-
+o", 
$object_dir, "-b");

gcov c:/path/to/file.gcda -o relative/path/to/source -b