[Bug hsa/81477] New: HSA offloading regressions: "function cannot be cloned"

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81477

            Bug ID: 81477
           Summary: HSA offloading regressions: "function cannot be
                    cloned"
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Keywords: openmp
          Severity: normal
          Priority: P3
         Component: hsa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: hubicka at gcc dot gnu.org, jamborm at gcc dot gnu.org,
                    marxin at gcc dot gnu.org
  Target Milestone: ---

I noticed that with HSA offloading enabled, as of r250048 ("Avoid global
optimize flag checks in LTO"), a handful of test cases FAIL "for excess
errors": "c-c++-common/gomp/pr61486-1.c" (C, C++),
"c-c++-common/gomp/pr63249.c" (C, C++), "g++.dg/gomp/pr63249.C",
"g++.dg/gomp/pr66571-1.C".

    cc1: warning: could not emit HSAIL for function foo._omp_fn.0: function
cannot be cloned [-Whsa]

gcc/ipa-hsa.c:

    /* If NODE is not versionable, warn about not emiting HSAIL and return
false.
       Otherwise return true.  */

    static bool
    check_warn_node_versionable (cgraph_node *node)
    {
      if (!node->local.versionable)
        {
          warning_at (EXPR_LOCATION (node->decl), OPT_Whsa,
                      "could not emit HSAIL for function %s: function cannot be
"
                      "cloned", node->name ());
          return false;
        }
      return true;
    }