[Bug middle-end/61207] New: Win64 gcc 4.9.0: ICE at -Os compiling some C++ code

["mingw.android at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61207

            Bug ID: 61207
           Summary: Win64 gcc 4.9.0: ICE at -Os compiling some C++ code
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mingw.android at gmail dot com

Created attachment 32810
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=32810&action=edit
testcase for Win64 gcc 4.9.0 ICE at -Os compiling some C++ code

I work on the MSYS2 project and we ran into:

g++ -Os -x c++ testcase.i
testcase.i: In constructor 'QQuickFlickablePrivate::QQuickFlickablePrivate()':
testcase.i:47:10: internal compiler error: in expand_expr_addr_expr_1, at
expr.c:7669
         {}
          ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://sourceforge.net/projects/msys2> for instructions.

This ICE doesn't happen at -O2 or when specifying the same flags that -Os
enables, so I think it is a specific size-optimization that causes this.

g++ --version
g++.exe (Rev4, Built by MSYS2 project) 4.9.0

.. I also tested with an unpatched version of 4.9.0 with the same results.