re PR libgcc/56846 (_Unwind_Backtrace on ARM and noexcept)

2014-09-10  Tony Wang  <tony.wang@arm.com>

    libstdc++-v3/
    PR target/56846
    * libsupc++/eh_personality.cc (PERSONALITY_FUNCTION):
    Return with CONTINUE_UNWINDING when the state pattern
    contains: _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND

From-SVN: r215101

libstdc++-v3/ChangeLog

+2014-09-10  Tony Wang  <tony.wang@arm.com>
+
+	PR target/56846
+	* libsupc++/eh_personality.cc (PERSONALITY_FUNCTION):
+	Return with CONTINUE_UNWINDING when the state pattern
+	contains: _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND
+
 2014-09-09  Jonathan Wakely  <jwakely@redhat.com>
 
 	* include/bits/deque.tcc (deque::operator=(const deque&)): Handle

libstdc++-v3/libsupc++/eh_personality.cc

@@ -378,6 +378,12 @@ PERSONALITY_FUNCTION (int version,
   switch (state & _US_ACTION_MASK)
     {
     case _US_VIRTUAL_UNWIND_FRAME:
+      // If the unwind state pattern is
+      // _US_VIRTUAL_UNWIND_FRAME | _US_FORCE_UNWIND
+      // then we don't need to search for any handler as it is not a real
+      // exception. Just unwind the stack.
+      if (state & _US_FORCE_UNWIND)
+	CONTINUE_UNWINDING;
       actions = _UA_SEARCH_PHASE;
       break;