[Bug libgomp/100573] [OpenMP] 'omp target teams' fails with nvptx and GCN offloading: FAIL libgomp.c-c++-common/for-3.c + for-9.c

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100573

--- Comment #12 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
With incremental
--- gcc/omp-offload.c.jj        2021-05-25 13:43:01.341137265 +0200
+++ gcc/omp-offload.c   2021-05-25 20:07:01.934506823 +0200
@@ -2696,8 +2696,16 @@ pass_omp_target_link::execute (function
     {
       gimple_stmt_iterator gsi;
       for (gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi))
-       if (walk_gimple_stmt (&gsi, NULL, find_link_var_op, NULL))
-         gimple_regimplify_operands (gsi_stmt (gsi), &gsi);
+       {
+         if (gimple_call_builtin_p (gsi_stmt (gsi), BUILT_IN_GOMP_TARGET))
+           {
+             /* Nullify the second argument of __builtin_GOMP_target_ext.  */
+             gimple_call_set_arg (gsi_stmt (gsi), 1, null_pointer_node);
+             update_stmt (gsi_stmt (gsi));
+           }
+         if (walk_gimple_stmt (&gsi, NULL, find_link_var_op, NULL))
+           gimple_regimplify_operands (gsi_stmt (gsi), &gsi);
+       }
     }

   return 0;
I see it fail with
Linking
Link complete: 0.000000ms
Link log info    : 240 bytes gmem, 1414 bytes cmem[3]

libgomp: cuModuleGetFunction error: named symbol not found

libgomp: Cannot map target functions or variables (expected 9, have 4294967295)
(target-41.c with GOMP_DEBUG=1), but it is unclear from that which named symbol
wasn't found.

Any idea how to troubleshoot what is missing?