[Bug sanitizer/85081] [7/8 Regression] Sanitizer error with references in vectorized/parallel for-loop

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85081

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-03-27
     Ever confirmed|0                           |1

--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Martin, this is because of:
  /* When within an OMP context, do not emit ASAN_MARK internal fns.  */
  if (gimplify_omp_ctxp)
    return;
in asan_poison_variable.  Not really sure why exactly it has been added, but if
we can't emit the ASAN_UNPOISON, we can't emit the corresponding ASAN_POISON
either.

So something like:
--- gcc/gimplify.c.jj   2018-03-16 13:43:14.831910333 +0100
+++ gcc/gimplify.c      2018-03-27 20:11:27.680195380 +0200
@@ -1689,7 +1689,8 @@ gimplify_decl_expr (tree *stmt_p, gimple
          && !TREE_STATIC (decl)
          && !DECL_HAS_VALUE_EXPR_P (decl)
          && DECL_ALIGN (decl) <= MAX_SUPPORTED_STACK_ALIGNMENT
-         && dbg_cnt (asan_use_after_scope))
+         && dbg_cnt (asan_use_after_scope)
+         && !gimplify_omp_ctxp)
        {
          asan_poisoned_variables->add (decl);
          asan_poison_variable (decl, false, seq_p);
@@ -6614,7 +6615,8 @@ gimplify_target_expr (tree *expr_p, gimp
            }
          if (asan_poisoned_variables
              && DECL_ALIGN (temp) <= MAX_SUPPORTED_STACK_ALIGNMENT
-             && dbg_cnt (asan_use_after_scope))
+             && dbg_cnt (asan_use_after_scope)
+             && !gimplify_omp_ctxp)
            {
              tree asan_cleanup = build_asan_poison_call_expr (temp);
              if (asan_cleanup)

fixes it from me, but not really sure about the reasons why the above check is
in there.  Martin?