[erlang-bugs] make docs fails in git master

Patrik Nyblom <>
Wed Oct 10 16:45:21 CEST 2012


On 10/05/2012 09:59 PM, Tuncer Ayaz wrote:
> On Fri, Oct 5, 2012 at 5:48 PM, Patrik Nyblom wrote:
>> On 10/05/2012 04:40 PM, Tuncer Ayaz wrote:
>>> On Fri, Oct 5, 2012 at 4:16 PM, Patrik Nyblom wrote:
>>>> Right, found it, a C statement with "undefined behaviour" exposed
>>>> by gcc 4.7. There is actually a warning from gcc. Try this patch
>>>> to master:
>>>> ----------------------
>>>> diff --git a/erts/emulator/beam/erl_message.c
>>>> b/erts/emulator/beam/erl_message.c
>>>> index e397f07..d5b7d01 100644
>>>> --- a/erts/emulator/beam/erl_message.c
>>>> +++ b/erts/emulator/beam/erl_message.c
>>>> @@ -1096,7 +1096,6 @@ erts_send_message(Process* sender,
>>>>           }
>>>>            BM_SWAP_TIMER(send,system);
>>>>    #endif /* #ifndef ERTS_SMP */
>>>> -       return;
>>>>        }
>>>>       return res;
>>>>    }
>>>> ---------------
>>> Thanks, that's it.
>>
>> Great! Thanks for the help with the huge bisect and the error
>> report!
>>
>> Fix will appear in master in a couple of days (hopefully :))!
> clang-3.2-git treats this as an error
>
> beam/erl_message.c:1099:2: error: non-void function 'erts_send_message'
>    should return a value [-Wreturn-type]
>
> while for gcc 4.7.1 it's a warning
>
> beam/erl_message.c:1099:2: warning: 'return' with no value, in
>    function returning non-void [-Wreturn-type]
>
> I don't have a gcc-4.8-git build to check with, but we can treat this
> warning as an error with gcc-4.7:
>
> $ CFLAGS="-Werror=return-type" ./otp_build setup -a
> [...]
> beam/erl_message.c:1099:2: error: 'return' with no value, in function
>    returning non-void [-Werror=return-type]
> cc1: some warnings being treated as errors
Could you do a patch to configure that enables this if using gcc? That 
would be really nice!

Cheers,
/Patrik
>
> http://gcc.gnu.org/wiki/ClangDiagnosticsComparison
>
>> Cheers,
>> /Patrik
>>>
>>>> Cheers,
>>>> /Patrik
>>>>
>>>> On 10/03/2012 09:26 PM, Tuncer Ayaz wrote:
>>>>> On Tue, Oct 2, 2012 at 6:58 PM, Tuncer Ayaz wrote:
>>>>>> On Tue, Oct 2, 2012 at 6:24 PM, Patrik Nyblom wrote:
>>>>>>>
>>>>>>> On Tue, 2 Oct 2012, Tuncer Ayaz wrote:
>>>>>>>
>>>>>>>> On Tue, Oct 2, 2012 at 5:59 PM, Patrik Nyblom wrote:
>>>>>>>>> And you configure parameters are?
>>>>>>>>
>>>>>>>> Nothing explicit, just automatic flags, with the fresh
>>>>>>>> rebuild. Not even --prefix. I'll mail you the configure.log
>>>>>>>> files? Anything else?
>>>>>>>
>>>>>>> Could you send me a complete log, from git clean -xfd to the
>>>>>>> crash? And what Linux/Unix distro you use?
>>>>>>>
>>>>>>> BTW, what's in your ERL_FLAGS when you do no set it to "-smp
>>>>>>> disable", anything fancy there?
>>>>>>>
>>>>>>> And the erl_crash.dump you get when running erl -smp disable
>>>>>>> might help.
>>>>>> Mailed you all the info and files.
>>>>>>
>>>>>>> Sorry, I'm clueless on this one. Did it work in R15B02 plain?
>>>>>>> Do you know a point when it stopped working?
>>>>>> No, I haven't bisected. Want me to?
>>>>> result of git-bisect started with OTP_R15B02=good and
>>>>> g3ba23ad=bad: e76262ea8ac6986a4 is the first bad commit



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