This is introduced by the new type merging code

jh@evans:~> /abuild/jh/trunk-install/bin/g++ -r -nostdlib -Os -g ~/d?.ii
-fwhopr
In file included from ../../../dist/include/nsThreadUtils.h:49:0,
                 from
/abuild/jh/mozilla-central/accessible/src/base/a11yGeneric.h:42,
                 from
/abuild/jh/mozilla-central/accessible/src/base/nsAccessNode.h:49,
                 from
/abuild/jh/mozilla-central/accessible/src/base/../atk/nsAccessNodeWrap.h:46,
                 from
/abuild/jh/mozilla-central/accessible/src/base/nsAccessible.h:42,
                 from
/abuild/jh/mozilla-central/accessible/src/base/../atk/nsAccessibleWrap.h:46,
                 from
/abuild/jh/mozilla-central/accessible/src/base/../html/nsHyperTextAccessible.h:48,
                 from
/abuild/jh/mozilla-central/accessible/src/base/../atk/nsHyperTextAccessibleWrap.h:42,
                 from
/abuild/jh/mozilla-central/accessible/src/base/nsARIAGridAccessible.h:44,
                 from
/abuild/jh/mozilla-central/accessible/src/base/nsARIAGridAccessible.cpp:39:
../../../dist/include/nsAutoPtr.h: In member function ‘void
nsAutoPtr<T>::assign(T*) [with T = AccGroupInfo]’:
../../../dist/include/nsAutoPtr.h:134:11:   instantiated from ‘nsAutoPtr<T>&
nsAutoPtr<T>::operator=(T*) [with T = AccGroupInfo]’
/abuild/jh/mozilla-central/accessible/src/base/nsAccessible.h:332:18:  
instantiated from here
../../../dist/include/nsAutoPtr.h:71:11: warning: possible problem detected in
invocation of delete operator: [enabled by default]
../../../dist/include/nsAutoPtr.h:69:14: warning: ‘oldPtr’ has incomplete type
[enabled by default]
/abuild/jh/mozilla-central/accessible/src/base/nsAccessible.h:55:7: warning:
forward declaration of ‘struct AccGroupInfo’ [enabled by default]
../../../dist/include/nsAutoPtr.h:71:11: note: neither the destructor nor the
class-specific operator delete will be called, even if they are declared when
the class is defined.
lto1: internal compiler error: Segmentation fault
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: /abuild/jh/trunk-install/bin/g++ returned 1 exit status
collect2: lto-wrapper returned 1 exit status


-- 
           Summary: -Os -g -fwhopr dwarf2out ICE
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: hubicka at gcc dot gnu dot org
 GCC build triplet: x86_64-linux
  GCC host triplet: x86_64-linux
GCC target triplet: x86_64-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45089