undefined reference to `llvm_omp_target_alloc_shared

Runtimes OpenMP
1

I'd like to use llvm_omp_targe_alloc_shared(), but can't link with Clang 12;
are they available in main?

2

The special allocators are supported upstream only for the nvptx64 target. The library interface was added in March and the nvptx64 implementation in May. The test file omp_device_managed_memory.c gives an example usage.

3

Hi Joseph, all,
I was looking at too the test code in the libomptarget/test/api
directory, and it can be built with today's main branch Clang.

However, are the llvm_ prefixed omp_targer_allocs callable from C++ codes?

4

Yes, but you will need to cast the returned void pointer and declare the function extern "C" so the name doesn’t get mangled.