some C++ code in a project of mine triggers an ICE in various g++ versions:

$ g++-4.1 -g -Wall -Wdeprecated -Wno-cast-qual -pipe -O2 -ftracer
finline-functions -fno-keep-static-consts   -fPIC -DPIC  -c xice-uma.cc 
xice-uma.cc:71: internal compiler error: in splice_child_die, at
dwarf2out.c:5503
Please submit a full bug report,...

$ g++-4.1 --version
g++-4.1 (GCC) 4.1.2 20060928 (prerelease) (Ubuntu 4.1.1-13ubuntu5)
$ uname -a
Linux cruncher 2.6.17-10-generic #2 SMP Tue Dec 5 22:28:26 UTC 2006 i686
GNU/Linux

$ g++-4.0 xice-uma.cc 
xice-uma.cc: In member function ‘const AutoLocker::Locker* AutoLocker::locker()
const’:
xice-uma.cc:97: internal compiler error: Segmentation fault
$ g++-3.4 xice-uma.cc 
xice-uma.cc: In member function `const AutoLocker::Locker* AutoLocker::locker()
const':
xice-uma.cc:97: internal compiler error: Segmentation fault
$ g++-3.3 xice-uma.cc 
xice-uma.cc: In member function `const AutoLocker::Locker* AutoLocker::locker() 
   const':
xice-uma.cc:97: internal compiler error: Segmentation fault

i managed to shrink this down to a may_alias attribute on a union, source code
follows as xice-uma.cc.


-- 
           Summary: ICE in splice_child_die, at dwarf2out.c:5503
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: timj at gtk dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30894