[Omake] multiple generator invokation

[Sam Steingold]

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I have a further question:

my_save(file) =
  if $(file-exists $(file))
    cp $(file) $(file).save

my_diff(file) =
  save=$(file).save
  if $(file-exists $(save))
    diff -u $(save) $(file) || true
    rm -f $(save)

UTDEST=../new
Ut(src) =
  return $(addprefix $(UTDEST)/ut_, $(addsuffix .ml, $(addsuffixes
_by_freq _by_type _simple, $(src))))
Map(src) =
  return $(addprefix $(UTDEST)/map_, $(addsuffixes .ml _flat.ml
_tree.ml, $(src)))
Gen(src) =
  return $(src)_tick.ml $(Ut $(src)) $(Map $(src))
R_GEN = $(Gen foo)
A_GEN = $(Gen bar)
AUTOGEN = $(R_GEN) $(A_GEN)
$(R_GEN) : ./tools/gen_foo.exe
  foreach($(my_save), $@)
  $< -by_type -tp foo_tick.ml -ut $(UTDEST)/ut_foo.ml \
    -map $(UTDEST)/map_foo.ml
  foreach($(my_diff), $@)

I noticed that the generator ./tools/gen_foo.exe is invoked 6(!) times
in quick succession (few seconds). why?

PS. Aleksey, thanks for your help with functions!

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