[Openmp-dev] Target CUDA RTL --> CUDA error is: an illegal memory access was encountered

[Itaru Kitayama via Openmp-dev]

[kitayama1 at juronc12 ~]$ clang++ -fno-rtti -g -fopenmp
-fopenmp-targets=nvptx64 test2.cpp
nvlink error   : Undefined reference to '__cxa_pure_virtual' in
'/tmp/test2-ed87e2.cubin'
clang-10: error: nvlink command failed with exit code 255 (use -v to see
invocation)

On Sun, Jan 12, 2020 at 3:20 PM Doerfert, Johannes <jdoerfert at anl.gov>
wrote:

> Can you try it with -fno-rtti.
>
> ________________________________________
> From: Itaru Kitayama <itaru.kitayama at gmail.com>
> Sent: Sunday, January 12, 2020 00:17
> To: Doerfert, Johannes
> Cc: Alexey Bataev; openmp-dev
> Subject: Re: [Openmp-dev] Target CUDA RTL --> CUDA error is: an illegal
> memory access was encountered
>
> This doesn't get compile:
>
> class AbsBase {
> virtual int f() = 0;
> };
> class Derived : public AbsBase {
> private:
> int a;
> public:
> int f() { a = 1; return a; }
> };
>
> int main() {
> #pragma omp target parallel for
> for (int i=0;i<10;i++) {
> Derived d;
> }
> }
>
> $ clang++ -g -fopenmp -fopenmp-targets=nvptx64 test2.cpp
> nvlink error   : Undefined reference to '__cxa_pure_virtual' in
> '/tmp/test2-d564cf.cubin'
> nvlink error   : Undefined reference to
> '_ZTVN10__cxxabiv117__class_type_infoE' in '/tmp/test2-d564cf.cubin'
> nvlink error   : Undefined reference to
> '_ZTVN10__cxxabiv120__si_class_type_infoE' in '/tmp/test2-d564cf.cubin'
> clang-10: error: nvlink command failed with exit code 255 (use -v to see
> invocation)
>
>
> On Sun, Jan 12, 2020 at 1:45 PM Doerfert, Johannes <jdoerfert at anl.gov
> <mailto:jdoerfert at anl.gov>> wrote:
> On 01/12, Itaru Kitayama wrote:
> > Do you guys have a timeframe for that feature
> > Implemented?
>
> I do not and I don't know anyone who will drive this right now.
>
> As mentioned before, you should be able to "move/copy-create" the
> elements on the device in order to use virtual functions.
>
>
> > On Sun, Jan 12, 2020 at 12:51 Doerfert, Johannes <jdoerfert at anl.gov
> <mailto:jdoerfert at anl.gov>> wrote:
> >
> > > On 01/11, Alexey Bataev via Openmp-dev wrote:
> > > > Virtual functions are not supported.
> > >
> > > Not yet ;).
> > >
> > > We'll get it with 5.1 so we might actually implement it soon. Till
> then,
> > > you have to create the object on the device you call the virtual
> > > function.
> > >
>
> --
>
> Johannes Doerfert
> Researcher
>
> Argonne National Laboratory
> Lemont, IL 60439, USA
>
> jdoerfert at anl.gov<mailto:jdoerfert at anl.gov>
>
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