[erlang-questions] Incorrect Beam Comparison

[dmkolesnikov@REDACTED]

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> 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>
> Sent: Thursday, March 22, 2018 12:44am
> To: "Prakash Parmar" <prakashkumar_parmar@REDACTED>, 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> 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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> 
> 
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