Rocm/aomp: typeid requests fail when offloading from OpenMP to gpu

[D-Dirk]

I am using rocm 2.4 on Ubuntu 18.04 with the rocm aomp tools and compilers based on clang 8 for offloading from OpenMP to AMD GPUs:

link to rocm/aomp project

The code works fine as long as I offload to the CPUs. However, once I offload to my GPU it only compiles and works when I remove all typeid requests. But I need these requests to pass the results and data from and to Rcpp (at least I get 18 errors if I don't have them all concerning typeid). The aomp compiler based on clang 8 suggests to compile with option -frtti but if I recompile my program with that option, the compilation still fails with the same error message.

I provide a minimal example by simply adding a single typeid request and the required header to one of the working examples from aomp, namely reduction.c:

link to aomp example "reduction"

`#include <stdio.h>
#define N 1000000ll
#define SUM (N * (N-1)/2)

int main (void)
{
long long a, i;

//std::cout << typeid(a).name() << std::endl;

#pragma omp target parallel shared(a) private(i)
{
#pragma omp master
a = 0;

#pragma omp barrier

#pragma omp for reduction(+:a)
for (i = 0; i < N; i++) {
    a += i;
}

// The Sum shall be sum:[0:N]
#pragma omp single
{
  if (a != SUM)
    printf ("Incorrect result = %lld, expected = %lld!\n", a, SUM);
  else
    printf ("The result is correct = %lld!\n", a);
}

}

return 0;
}`

This works fine when compiled unchanged with the following options:

$ /opt/rocm/aomp/bin/clang++ -frtti -target x86_64-pc-linux-gnu -fopenmp -fopenmp-targets=amdgcn-amd-amdhsa -Xopenmp-target=amdgcn-amd-amdhsa -march=gfx906 reduction.c

However, when I uncomment the single typeid request in the code above and add the required headers at the very top:

#include <typeinfo> #include <iostream>

the compilation fails with the error:

reduction.c:12:14: error: use of typeid requires -frtti

which is however already used. Once I compile with CPU options only, it works again:

$ /opt/rocm/aomp/bin/clang++ -target x86_64-pc-linux-gnu -fopenmp reduction.c

Does anybody know the reason for this problem and how it can be solved? Any hint would be greatly appreciated!

[tasso]

Is this still reproducible? If not, can we please close it? Thanks!

[tasso]

Original ticket is more than a year old and the person that opened ticket originally has not responded to the latest request. If this is still an issue, please file a new ticket and we will happy to investigate it. Thanks!