Re: c++/9704: [3.3/3.4 regression] miscompilation of classes with bit fields

[bangerth@dealii.org]

Old Synopsis: miscompiles openoffice (deals with bitfield members)
New Synopsis: [3.3/3.4 regression] miscompilation of classes with bit fields

Responsible-Changed-From-To: unassigned->mmitchel
Responsible-Changed-By: bangerth
Responsible-Changed-When: Fri Feb 14 22:14:05 2003
Responsible-Changed-Why:
    Possibly the one who's guilty ;-)
State-Changed-From-To: open->analyzed
State-Changed-By: bangerth
State-Changed-When: Fri Feb 14 22:14:05 2003
State-Changed-Why:
    Confirmed. Cleaned-up code:
    --------------------------
    extern "C" void abort(void);
    
    struct Dummy {
        void *p;
        Dummy()             {}
        Dummy(const Dummy&) {}
    };
    
    struct X {
        int  :1;
        int n:1;
        X () : n(1) {}
    };
    
    
    struct Y {
        Dummy dummy;
        X x;
    };
    
    int main()
    {
      Y y1;
      Y y2(y1);
      if (y1.x.n != y2.x.n)
        abort ();
    }
    ------------------------------
    This aborts with 3.3 and 3.4, though it shouldn't, of
    course (original and copy should be equal).
    
    W.

http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=9704