Hello,

I'm working on Dev-cpp this is the output :
********************************************************************************

Compiler: Default compiler
Building Makefile: "C:\cygwin\tmp\Makefile.win"
Executing  make...
make.exe -f "C:\cygwin\tmp\Makefile.win" all
g++.exe -c toto.cc -o toto.o -I"C:/GTK/INCLUDE"  -I"C:/GTK/INCLUDE/GTK-2.0"  -I"C:/GTK/INCLUDE/GLIB-2.0"  -I"C:/GTK/INCLUDE/PANGO-1.0"  -I"C:/GTK/INCLUDE/ATK-1.0"  -I"C:/GTK/INCLUDE/GTKGLEXT-1.0"  -I"C:/GTK/LIB/GTK-2.0/INCLUDE"  -I"C:/GTK/LIB/GLIB-2.0/INCLUDE"  -I"C:/GTK/LIB/GTKGLEXT-1.0/INCLUDE"  -I"C:/GTK/INCLUDE/LIBGLADE-2.0"  -I"C:/GTK/INCLUDE/LIBXML2"  -v -save-temps  

Using built-in specs.
Target: mingw32
Configured with: ../gcc-4.1.2/configure --with-gcc --with-gnu-ld --with-gnu-as --host=mingw32 --target=mingw32 --prefix=C:/MinGW --enable-threads --disable-nls --enable-languages=c,c++ --disable-win32-registry --disable-shared --enable-fully-dynamic-string --disable-libstdcxx-pch
Thread model: win32
gcc version 4.1.2
 c:/dev-cpp/bin/../libexec/gcc/mingw32/4.1.2/cc1plus.exe -E -quiet -v -IC:/GTK/INCLUDE -IC:/GTK/INCLUDE/GTK-2.0 -IC:/GTK/INCLUDE/GLIB-2.0 -IC:/GTK/INCLUDE/PANGO-1.0 -IC:/GTK/INCLUDE/ATK-1.0 -IC:/GTK/INCLUDE/GTKGLEXT-1.0 -IC:/GTK/LIB/GTK-2.0/INCLUDE -IC:/GTK/LIB/GLIB-2.0/INCLUDE -IC:/GTK/LIB/GTKGLEXT-1.0/INCLUDE -IC:/GTK/INCLUDE/LIBGLADE-2.0 -IC:/GTK/INCLUDE/LIBXML2 -iprefix c:\dev-cpp\bin\../lib/gcc/mingw32/4.1.2/ toto.cc -fpch-preprocess -o toto.ii

ignoring nonexistent directory "c:/dev-cpp/bin/../lib/gcc/mingw32/4.1.2/../../../../include/c++/4.1.2"
ignoring nonexistent directory "c:/dev-cpp/bin/../lib/gcc/mingw32/4.1.2/../../../../include/c++/4.1.2/mingw32"
ignoring nonexistent directory "c:/dev-cpp/bin/../lib/gcc/mingw32/4.1.2/../../../../include/c++/4.1.2/backward"
ignoring nonexistent directory "c:/dev-cpp/bin/../lib/gcc/mingw32/4.1.2/../../../../mingw32/include"
ignoring nonexistent directory "C:/MinGW/lib/gcc/mingw32/../../../include/c++/4.1.2"
ignoring nonexistent directory "C:/MinGW/lib/gcc/mingw32/../../../include/c++/4.1.2/mingw32"
ignoring nonexistent directory "C:/MinGW/lib/gcc/mingw32/../../../include/c++/4.1.2/backward"
ignoring nonexistent directory "C:/MinGW/lib/gcc/mingw32/4.1.2/include"
ignoring nonexistent directory "C:/MinGW/lib/gcc/mingw32/../../../mingw32/include"
#include "..." search starts here:
#include <...> search starts here:
 C:/GTK/INCLUDE
 C:/GTK/INCLUDE/GTK-2.0
 C:/GTK/INCLUDE/GLIB-2.0
 C:/GTK/INCLUDE/PANGO-1.0
 C:/GTK/INCLUDE/ATK-1.0
 C:/GTK/INCLUDE/GTKGLEXT-1.0
 C:/GTK/LIB/GTK-2.0/INCLUDE
 C:/GTK/LIB/GLIB-2.0/INCLUDE
 C:/GTK/LIB/GTKGLEXT-1.0/INCLUDE
 C:/GTK/INCLUDE/LIBGLADE-2.0
 C:/GTK/INCLUDE/LIBXML2
 c:/dev-cpp/bin/../lib/gcc/mingw32/4.1.2/../../../../include
 c:/dev-cpp/bin/../lib/gcc/mingw32/4.1.2/include
 C:/MinGW/lib/gcc/mingw32/../../../include
 C:/MinGW/include

 /mingw/include
End of search list.

 c:/dev-cpp/bin/../libexec/gcc/mingw32/4.1.2/cc1plus.exe -fpreprocessed toto.ii -quiet -dumpbase toto.cc -auxbase-strip toto.o -version -o toto.s

GNU C++ version 4.1.2 (mingw32)
	compiled by GNU C version 4.1.2.
GGC heuristics: --param ggc-min-expand=99 --param ggc-min-heapsize=130982
Compiler executable checksum: 669e873dd1c794b0f5ddbea8fe211782
toto.cc:54: internal compiler error: in write_type, at cp/mangle.c:1651
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.

make.exe: *** [toto.o] Error 1

Execution terminated
********************************************************************************

the same error occurs on cygwin (v 3.4.4) and on latest ubuntu (v 4.2?)

this is the code:
********************************************************************************
#include <complex>

using namespace std;

template <class T>
class X
{
public:
    X() {}
};

template <class T>
class Y
{
public:
    template <class U>
    Y(const X<U>&) {}

    template <class U>
    Y& operator *=(const U&) { return *this; }
};

template <class Tx, class Ty>
Y<typeof(Tx()*Ty())> operator *(X<Tx>& x, const Ty& y)
{
    Y<typeof(Tx()*Ty())> res(x);
    //res *= y;
    return res;
}

template <class Tx, class Ty>
Y<typeof(Tx()*Ty())> operator *(const Tx& x, X<Ty>& y)
{
    Y<typeof(Tx()*Ty())> res(y);
    //res *= x;
    return res;
}

int main()
{
    double a;
    complex<double> b;
    X<double> i;
    X<complex<double> > j;

    i*a;
    a*i;
    i*b;
    b*i;

    j*a;
    a*j;
    j*b;
    b*j;
}

********************************************************************************
It's my first bug report, How can I give you the .ii file?