use open_out_bin (open_out does not work with marshal on windows) #889
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Note
output_value,input_valuerequires channel to be opened in binary modehttps://caml.inria.fr/mantis/view.php?id=5639
TODO:
Reading directories from
sources, we need convert linux path to platform dependent path,however, we should only convert it into absolute path for once? (or it maybe not necessary since source files have to be in the project directory)