Hello
I am working on adding OpenMP offloading to a C++ code. I would like to declare target a few functions since they are called in offloaded compute loops. While doing this I encountered a possible issue in the nvc++ compiler.
If I understand the standard correctly, then functions that are referenced within a function that has been declare target and that are defined in the same compilation unit are implicitly declare target too and don’t need themselves an explicit annotation. This works fine if both functions are in the same namespace. But if the referenced function is not in the same namespace I am getting following error:
NVC++-S-1073-Procedures called in a OpenMP target region must have 'omp declare target' information - a() (reproducer.cpp: 7)
Here is a minimal reproducer that fails with nvhpc 21.11 and CUDA 11.5.1:
void a() {}
namespace n {
#pragma omp declare target
void b() { a(); }
#pragma omp end declare target
}
I am not sure if I’m missing here something, but I think above example should work.
For testing I tried to compile the same example with recent versions of LLVM and Intel oneAPI, which seems to work fine.
Thanks!