[cfe-dev] Clang/LLVM OpenMP program not spawning threads

[Anton Korobeynikov]

Probably for 3.7 we'd need to issue a warning / error for -fopenmp w/o libomp.

On Tue, Jul 28, 2015 at 1:28 PM, David Chisnall
<David.Chisnall at cl.cam.ac.uk> wrote:
> On 28 Jul 2015, at 11:12, Andrey Bokhanko <andreybokhanko at gmail.com> wrote:
>>
>> On Tue, Jul 28, 2015 at 12:37 PM, David Chisnall
>> <David.Chisnall at cl.cam.ac.uk> wrote:
>>> On 27 Jul 2015, at 23:19, Jaime Arteaga <jandres742 at gmail.com> wrote:
>>>>
>>>> clang -lomp -I/.../openmp/runtime/exports/common/include -L/.../openmp/runtime/exports/lin_32e/lib ./test-openmp.c -o ./test-openmp
>>>
>>> Doesn’t this need -fopenmp?
>>
>> -fopenmp alone is not enough, since OpenMP support (that relies on
>> Intel OMP API) is enabled *only* if compiler is specifically directed
>> to target libomp. Thus, -fopenmp=libomp is required.
>
> Ugh.  I thought we were going to fix that before the 3.7 release.  Having -fopenmp default to the null implementation is quite user hostile.
>
> David
>
>
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-- 
With best regards, Anton Korobeynikov
Faculty of Mathematics and Mechanics, Saint Petersburg State University