[erlang-questions] Incorrect Beam Comparison

Thu Mar 22 07:15:10 CET 2018

I had decoded "Abst" chunk of both beam file and there are difference in Absolute path, rest of chunk content are same. I think during compilation source directory's relative path is being added into this Chunk.

 Is there any way to ignore path inclusion in "Abst" chunk ? or Is there any option to say the Compiler to use Absolute path rather than Relative path. 

I have strip both beam file using beam_lib:strip/1 to remove 'debug_info' and 'abstract_code' chunk. But it shows difference in "Line" chunk :( Does anyone explain what is use of "Line" chunk and Why there is difference ?

- Prakash

-----Original Message-----
From: dmkolesnikov@REDACTED
Sent: Thursday, March 22, 2018 10:57am
To: "Prakash Parmar" <prakashkumar_parmar@REDACTED>
Cc: "Vladimir Gordeev" <gordeev.vladimir..v@REDACTED>, erlang-questions@REDACTED
Subject: Re: [erlang-questions] Incorrect Beam Comparison

Hello,
Compilation process injects various attributes to you module. Check them out to find difference xxx:module_info()
-Dmitry 

On 22 Mar 2018, at 6.31, Prakash Parmar <[ prakashkumar_parmar@REDACTED ]( mailto:prakashkumar_parmar@REDACTED )> wrote:

Source code of Both files are same but both compiled from different Branch. Chksum of both *.erl file are same but *.beam files are different.

-----Original Message-----
From: "Vladimir Gordeev" <[ gordeev.vladimir.v@REDACTED ]( mailto:gordeev.vladimir.v@REDACTED )>
Sent: Thursday, March 22, 2018 12:44am
To: "Prakash Parmar" <[ prakashkumar_parmar@REDACTED ]( mailto:prakashkumar_parmar@REDACTED )>, [ erlang-questions@REDACTED ]( mailto:erlang-questions@REDACTED )
Subject: Re: [erlang-questions] Incorrect Beam Comparison

> both files are Identical..

Indentical in the sense that content of *.beam files produce exactly same hashsum?

On Wed, Mar 21, 2018 at 1:13 PM, Prakash Parmar <[ prakashkumar_parmar@REDACTED ]( mailto:prakashkumar_parmar@REDACTED )> wrote:

Hello Everyone,

I have a two identical branch in SVN and I'm trying to compare beam file of both branch. For same I'm using beam_lib:cmp/2 .

beam_lib:cmp("./erl_experiment-0.1.0/ebin/mynew_server.beam","./erl_experiment-0.2.0/ebin/mynew_server.beam").
{error,beam_lib,{chunks_different,"Abst"}}

Though both files are Identical. Still beam_lib:cmp/2 is giving difference in 'Abst' chunk.

Does anyone have idea what's going wrong or reason ?

Here is a svn diff of between both branch for reference.

 user@REDACTED:~/svn/erl_experiment/branches/rel_v0_2_0$ svn diff -r18
 Index: lib/erl_experiment/src/erl_experiment.app.src
 _===================================================================_
 --- lib/erl_experiment/src/erl_experiment.app.src    (.../rel_v0_1_0)    (revision 18)
 +++ lib/erl_experiment/src/erl_experiment.app.src    (.../rel_v0_2_0)    (working copy)
 @@ -1,6 +1,6 @@
  {application, erl_experiment,
   [{description, "An OTP application"},
 -  {vsn, "0.1.0"},
 +  {vsn, "0.2.0"},
    {registered, []},
    {mod, { erl_experiment_app, []}},
    {applications,
 Index: rebar.config
 ===================================================================
 --- rebar.config    (.../rel_v0_1_0)    (revision 18)
 +++ rebar.config    (.../rel_v0_2_0)    (working copy)
 @@ -5,7 +5,7 @@
  { base_dir, "../_build"}.
  { out_dir, "../_build/default/lib/"}.

 -{relx, [{release, {erl_experiment, "0.1.0"}, [ erl_experiment, kernel, stdlib, sasl ]},
 +{relx, [{release, {erl_experiment, "0.2.0"}, [ erl_experiment, kernel, stdlib, sasl ]},

   {dev_mode, false},
   {include_erts, true},

Cheers,
Prakash

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