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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: java-prs@gcc.gnu.org
Subject: [Bug java/60667] Undefined behavior in Java FE
Date: Fri, 28 Mar 2014 16:06:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60667

--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Supposedly you could just try to configure with --disable-lto to workaround it.
Not to mention that you really don't need to do bootstrap-ubsan for this, just
add
--- gcc/double-int.c    2014-01-03 11:40:46.102383481 +0100
+++ gcc/double-int.c    2014-03-28 17:05:37.237498526 +0100
@@ -1060,9 +1060,11 @@ double_int::set_bit (unsigned bitpos) co
   double_int a = *this;
   if (bitpos < HOST_BITS_PER_WIDE_INT)
     a.low |= (unsigned HOST_WIDE_INT) 1 << bitpos;
-  else
+  else if (bitpos < HOST_BITS_PER_DOUBLE_INT)
     a.high |= (HOST_WIDE_INT) 1 <<  (bitpos - HOST_BITS_PER_WIDE_INT);
- 
+  else
+    gcc_unreachable ();
+
   return a;
 }

and you should be able to reproduce it with normal bootstrap/regtest.