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

[Marcelo Novaes via Openmp-dev]

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
>>
>


-- 
Best,
Marcelo
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