[Bug libgomp/81689] New: libgomp.c/target-link-1.c fails for nvptx: #pragma omp target link not implemented

["vries at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81689

            Bug ID: 81689
           Summary: libgomp.c/target-link-1.c fails for nvptx: #pragma omp
                    target link not implemented
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: vries at gcc dot gnu.org
                CC: jakub at gcc dot gnu.org
  Target Milestone: ---

The error looks like:
...
ptxas /tmp/ccOmk7fK.o, line 102; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 121; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 126; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 231; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 252; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 289; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 294; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 301; error   : State space mismatch between
instruction and address in instruction 'ld'^M
ptxas /tmp/ccOmk7fK.o, line 102; error   : Unknown symbol 'a_linkptr'^M
ptxas /tmp/ccOmk7fK.o, line 102; fatal   : Label expected for forward reference
of 'a_linkptr'^M
ptxas fatal   : Ptx assembly aborted due to errors^M
nvptx-as: ptxas returned 255 exit status^M
mkoffload: fatal error: x86_64-none-linux-gnu-accel-nvptx-none-gcc returned 1
exit status^M
compilation terminated.^M
...

The problem is that #pragma omp target link is not implemented for nvptx, as
mentioned before here (
https://gcc.gnu.org/ml/gcc-patches/2016-11/msg00972.html ):
...
With OpenMP/PTX offloading there are 5 additional failures in
check-target-libgomp:

<SNIP>

One with 'target link' (not implemented)
FAIL: libgomp.c/target-link-1.c (test for excess errors)
...