[Openmp-dev] [cfe-dev] Error building openmp 3.1 on clang 3.7

[Marcelo Novaes via Openmp-dev]

Hi all,

I was wondering if from OpenMP 4.0 to OpenMP 4.5, does the way it chooses
the number of thread-blocks and the number of threads per block was
changed?

Thank you very much in advance.

best,
Marcelo


2017-08-10 6:00 GMT-03:00 Marcelo Novaes <novaes.ssa at gmail.com>:

> That's fine, for my purpose, it would be good, but I don't need to reflect
> the current implementation.
>
> I'll try to update it asap :) thank you!
>
> best,
> Marcelo
>
> 2017-08-10 5:53 GMT-03:00 Jonas Hahnfeld <hahnjo at hahnjo.de>:
>
>> Hmm, that's bad: 3.7 has been released almost 2 years ago, so whatever
>> results you measure with this pretty much won't reflect the current
>> implementation.
>>
>> Jonas
>>
>>
>> Am 2017-08-10 10:43, schrieb Marcelo Novaes:
>>
>>> hello Jonas, I meant, I didn't try any newer version by now.
>>>
>>> 2017-08-10 5:43 GMT-03:00 Marcelo Novaes <novaes.ssa at gmail.com>:
>>>
>>> Hello Jonas,
>>>>
>>>> I am not able to answer that at least until this weekend, sorry (I
>>>> am in a rush with a strict deadline).
>>>>
>>>> But I can get back to you with the answer soon.  If you need it
>>>> really soon, let me know.
>>>>
>>>> best regards,
>>>> Marcelo
>>>>
>>>> 2017-08-10 5:31 GMT-03:00 Jonas Hahnfeld <hahnjo at hahnjo.de>:
>>>> Hi Marcelo,
>>>>
>>>> so does this need to be fixed in the source or has that already
>>>> happened for newer versions?
>>>>
>>>> Thanks,
>>>> Jonas
>>>>
>>>> Am 2017-08-10 10:27, schrieb Marcelo Novaes:
>>>>
>>>> Hi Jonas,
>>>>
>>>> I've figured it out and forgot to reply here.
>>>>
>>>> Anyways, thank you for the reply!
>>>>
>>>> best
>>>>
>>>> --
>>>> Solution: added ffi dynamic lib inside the
>>>> openmp/src/CMakeLists.txt.
>>>> Then, built openmp (make sure the binary once compiled is linked
>>>> with
>>>> the correct omp, not gomp (from gcc) checking via ldd).
>>>>
>>>> 2017-08-10 4:12 GMT-03:00 Jonas Hahnfeld <hahnjo at hahnjo.de>:
>>>>
>>>> Hi,
>>>>
>>>> +openmp-dev for discussion about the runtime.
>>>>
>>>> 3.7 is quite old, do you see the same problem with 4.0.1? There
>>>> might be some patches in that fixed the build for ARM.
>>>>
>>>> Regards,
>>>> Jonas
>>>>
>>>> Am 2017-08-09 19:15, schrieb Marcelo Novaes via cfe-dev:
>>>>
>>>> Hi all,
>>>>
>>>> Should I be able to use OpenMP 3.1 using Clang 3.7 on  LLVM 3.7 on
>>>> an
>>>> ARM board with a Linux 3.10.63+?
>>>>
>>>> I've built the llvm 3.7 with clang 3.7 successfully, but it didn't
>>>> generate omp dynamic lib. I'm getting an error when I try to do a
>>>> "make" inside of my build/projects/openmp.
>>>>
>>>> Linking C shared library ../../../../lib/libomp.so
>>>> CMakeFiles/omp.dir/z_Linux_util.c.o: In function
>>>> `__kmp_invoke_microtask':
>>>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0x9e): undefined
>>>> reference to `ffi_prep_cif'
>>>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0xac): undefined
>>>> reference to `ffi_call'
>>>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0xd4): undefined
>>>> reference to `ffi_type_pointer'
>>>> z_Linux_util.c:(.text.__kmp_invoke_microtask+0xd8): undefined
>>>> reference to `ffi_type_void'
>>>> collect2: error: ld returned 1 exit status
>>>> make[2]: *** [lib/libomp.so] Error 1
>>>>
>>>> However, I have libffi linked, it didn't help.
>>>>
>>>> I want to generate a dyn lib I can call, I was calling a dyn from
>>>> my
>>>> gcc, but clang was not able to execute multi thread code compiled
>>>> with
>>>> the gcc's dynamic lib (it basically ignored the pragmas).
>>>> _______________________________________________
>>>> cfe-dev mailing list
>>>> cfe-dev at lists.llvm.org
>>>> http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev [1] [1]
>>>>
>>>
>>>  --
>>>
>>> Best,
>>> Marcelo
>>>
>>> Links:
>>> ------
>>> [1] http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev [1]
>>>
>>> --
>>>
>>> Best,
>>> Marcelo
>>>
>>> --
>>>
>>> Best,
>>> Marcelo
>>>
>>> Links:
>>> ------
>>> [1] http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-dev
>>>
>>
>
>
> --
> Best,
> Marcelo
>



-- 
Best,
Marcelo
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