[erlang-questions] Dialyzer PLT & unknown Erlang/OTP functions

Olivier BOUDEVILLE <>
Mon Aug 29 16:58:14 CEST 2011


Hi,

I am using R14B03, and apparently cannot succeed in making good use of 
Dialyzer: I wanted first to generate a PLT for the full Erlang/OTP install 
and then use it against my codebase to perform more accurate checkings.

So I generated a full PLT with a line like:
(this is slightly edited as actually the building of the PLT is already 
integrated into the script we use to streamline our Erlang installations)

${prefix}/bin/dialyzer --build_plt -r ${prefix}/lib/erlang --output_plt 
${prefix}/Erlang-R14B03.plt

The operation seems to succeed and I end up some time later with a 4.4MB 
PLT file.

However if I run it against a random module of us:

 ${prefix}/bin/dialyzer --plt ${prefix}/Erlang-R14B03.plt  --output_plt 
./common.plt  src/utils/basic_utils.beam  --build_plt

It looks as if the previous PLT was not used:

  Creating PLT ./common.plt ...
Unknown functions:
  calendar:datetime_to_gregorian_seconds/1
  calendar:seconds_to_daystime/1
  code:get_object_code/1
  global:register_name/2
  global:unregister_name/1
  global:whereis_name/1
  os:cmd/1
  random:seed/0
  random:seed/3
  random:uniform/0
  random:uniform/1
  rpc:multicall/5
  sets:from_list/1
  sets:to_list/1
  string:tokens/2
  text_utils:string_to_integer/1
  timer:sleep/1
 done in 0m0.58s
done (passed successfully)

Most of these functions come from stdlib and al, so I would expect them to 
be in Erlang-R14B03.plt. 
And if I run, as an example (calendar being among the missing modules):

${prefix}/dialyzer --plt_info --plt ${prefix}/Erlang-R14B03.plt | grep 
calendar

I have:
 "${prefix}/lib/erlang/lib/stdlib-1.17.4/ebin/calendar.beam",

So apparently the two calendar functions should be known of  this PLT.

I must be making some mistake, but I tried different other approaches (ex: 
with '--apps erts kernel stdlib' instead of a wide '-r ') but with no 
luck.

Are the installed BEAMs stripped in some way of debug_info/type specs, or 
anything like that ?

Any help appreciated!

Thanks in advance,
Best regards,

Olivier.
---------------------------
Olivier Boudeville

EDF R&D : 1, avenue du Général de Gaulle, 92140 Clamart, France
Département SINETICS, groupe ASICS (I2A), bureau B-226
Office : +33 1 47 65 59 58 / Mobile : +33 6 16 83 37 22 / Fax : +33 1 47 
65 27 13



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