problem with enum and aliasing for gcc4.0.2?

problem with enum and aliasing for gcc4.0.2?

[Dirk-Jan Jongeneel]

I have a problem with enum and aliasing with a g++ gcc 4.0.2 compile 
that used to work on gcc3.2.3.

It circles around the following construct ++((int &)t) where t is an 
enum in a for loop.

I managed to strip it down to the following example:

class TOP {
public:
        class TEST;
        enum MY_ENUM {
        FIRST_MY_ENUM = 0,   // use to iterate in "for" loops
        MY_ENUM_MIN = 0,
        ENUM_0 = 0,
        ENUM_1 = 1,
        ENUM_2 = 2,
        ENUM_3 = 3,
        MY_ENUM_MAX = 4,
        INVALID_MY_ENUM = 4  // use to iterate in "for" loops
    };
#ifndef FIX
        inline static void incr(MY_ENUM &t) {++((int &)t);}
#else
        inline static void incr(MY_ENUM &t){
                int i=t;
        i++;
        t=(TOP::MY_ENUM)i;
#endif
};

class TOP::TEST {
public:
        TEST(){
                for ( int i = FIRST_MY_ENUM; i < INVALID_MY_ENUM; ++i) {
            _data[i]=0.0;
        }
        }
        TEST(const TEST &that){
                for ( TOP::MY_ENUM i = TOP::FIRST_MY_ENUM; i < 
TOP::INVALID_MY_ENUM;
incr(i)) {
                        _data[i]=that._data[i];
                }
        }
        double get_data(){
                return _data[0];
        }
private:
       double _data[INVALID_MY_ENUM];
     };

TOP::TEST testclass;
TOP::TEST testclass2(testclass);

main(){
        //cout<<testclass.get_data()<<'\n';
        //cout<<testclass2.get_data()<<'\n';

}

If compiled on -O2 or -O3 it will hang forever in the second 
constructer. If -fno-strict-aliasing is added it passes.
I actually beleave that if I would replace the constructors to function 
and call them I would still run into the same problem but this is the 
construct as I found it. I am not alble to get warning related to 
aliasing. I am not sure if this is actually valid code or a gcc bug. In 
case it is not a warning would have been nice. If compiled with -DFIX 
and thus using the other version of the incr function it works fine.

Thanks

Dirk-Jan