[Bug tree-optimization/104069] -Werror=use-after-free false positive on elfutils-0.186

[msebor at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104069

--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Actually, this is already supposed to be handled but the code is not effective
due to a typo.  This fixes it:

diff --git a/gcc/gimple-ssa-warn-access.cc b/gcc/gimple-ssa-warn-access.cc
index f639807a78a..f9508a1d211 100644
--- a/gcc/gimple-ssa-warn-access.cc
+++ b/gcc/gimple-ssa-warn-access.cc
@@ -4082,7 +4082,9 @@ pointers_related_p (gimple *stmt, tree p, tree q,
pointer_query &qry)
   access_ref pref, qref;
   if (!qry.get_ref (p, stmt, &pref, 0)
       || !qry.get_ref (q, stmt, &qref, 0))
-    return true;
+    /* GET_REF() only rarely fails.  When it does, it's likely because
+       it involves a self-referential PHI.  Return a conservative result.  */
+    return false;

   return pref.ref == qref.ref;
 }