------- Comment #9 from tbm at cyrius dot com  2007-10-19 21:10 -------
(In reply to comment #8)
> Whether or not an ICE occurs depends to some extent
> on checking being enabled.  With checking enabled, I see this on 4.1
> and the trunk.
> 
> The ICE is here:
> 
>           result = expand_expr (exp, target, tmode,
>                                 modifier == EXPAND_INITIALIZER
>                                 ? EXPAND_INITIALIZER : EXPAND_CONST_ADDRESS);
> 
>           /* If the DECL isn't in memory, then the DECL wasn't properly
>              marked TREE_ADDRESSABLE, which will be either a front-end
>              or a tree optimizer bug.  */
>          gcc_assert (MEM_P (result));

Julien Cristau just reported an ICE with gcc 4.2 on hppa and I tracked it down
to the same piece of quote you're quoting above.  Note that my reduced testcase
produces an ICE with gcc 4.1, 4.2 and trunk.  Dave, can you take a look at it
please?

The following testcase requires -O:

paer% gcc-4.2 -c -O2 basematrix.cc
basematrix.cc: In member function ‘void S_BaseMatrix<complex<double>
>::_ZTv0_n12_N12S_BaseMatrixI7complexIdEE12MultTransAddES1_(Complex)’:
basematrix.cc:33: internal compiler error: in expand_expr_addr_expr_1, at
expr.c:6554
Please submit a full bug report,
with preprocessed source if appropriate.


Testcase:

/* Testcase by Martin Michlmayr <tbm@cyrius.com> */

template < typename _CharT > class basic_stringstream;
typedef basic_stringstream < char >stringstream;

template < typename _CharT > class basic_ios
{
};
template < typename _CharT > class basic_stringstream:
 virtual public basic_ios < _CharT >
{
};

template < typename _Tp > class complex;
template <> struct complex <double >
{
    __complex__ double _M_value;
};
typedef complex < double >Complex;

class BaseMatrix
{
    virtual void MultTransAdd (Complex s);
};
template < typename SCAL > class S_BaseMatrix:virtual public BaseMatrix
{
};
template < > class S_BaseMatrix < Complex >:virtual public BaseMatrix
{
    virtual void MultTransAdd (Complex s);
};
void S_BaseMatrix < Complex >::MultTransAdd (Complex s) {
    stringstream err;
}


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29209