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Message from discussion http_uri_parse/1 inconsistent return value + dialyser headache
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Zabrane Mickael  
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 More options Aug 14 2012, 8:38 am
From: Zabrane Mickael <zabra...@gmail.com>
Date: Tue, 14 Aug 2012 14:38:19 +0200
Local: Tues, Aug 14 2012 8:38 am
Subject: Re: [erlang-questions] http_uri_parse/1 inconsistent return value + dialyser headache
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Following Magnus & Motiejus great suggestions, here it is:

%-------- put this marco somewhere (.hrl, top of your .erl)
-ifdef(DIALYZER_CATCH).
-define(CATCH_FOR_DIALYZER(X), catch X).
-else.
-define(CATCH_FOR_DIALYZER(X), X).
-endif.

%------- the new code
-spec http_uri_parse([byte()]) -> {ok, tuple()} | {error, atom()}.
http_uri_parse(URL) ->
    case ?CATCH_FOR_DIALYZER(http_uri:parse(URL)) of
        {ok,{_, _, _, _, _, _}} = Ret15 -> %% >=R15B
            Ret15;
        {_, _, _, _, _, _} = Ret14 -> %% =< R14B
            {ok, Ret14};
        Error ->
            Error
    end.

Add this flag "-DDIALYZER_CATCH=1" to your Dialyzer command line:
$ dialyzer --src src --plt /path  ...  -DDIALYZER_CATCH=1

Everything's perfect now.

Thanks for sharing these guys.
You saved my day.

Regards,
Zabrane

On Aug 14, 2012, at 2:06 PM, Magnus Henoch wrote:

> Motiejus Jakštys <desired....@gmail.com> writes:

>> On Tue, Aug 14, 2012 at 2:04 PM, Magnus Henoch
>> <magnus.hen...@erlang-solutions.com> wrote:
>>> Zabrane Mickael <zabra...@gmail.com> writes:

>>> An advanced variant of that is to define a ?catch_for_dialyzer macro
>>> that expands to nothing for normal compilation, and to 'catch' when
>>> running Dialyzer.

>> Interesting. How do you know when you are running in dialyzer (i.e.
>> how would you define that macro)?

> The only way I know is to have your build system pass different -D flags
> for normal compilation and dialyzer.

> Regards,
> Magnus

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