From 3.4 branch.  Fixes test failure

 FAIL: g++.dg/abi/empty6.C  (test for warnings, line 6)

 ===================================================================

 RCS file: /cvs/gcc/gcc/gcc/testsuite/g++.dg/abi/empty6.C,v

 retrieving revision 1.1

 retrieving revision 1.2

 diff -u -r1.1 -r1.2

 --- gcc/gcc/testsuite/g++.dg/abi/empty6.C	2002/09/25 19:07:35	1.1

 +++ gcc/gcc/testsuite/g++.dg/abi/empty6.C	2003/06/03 19:10:09	1.2

 @@ -5,4 +5,9 @@

  struct B {

    A a; // { dg-warning "empty" }

    virtual void f () {}

 -};

 +} __attribute__((aligned(8)));

 +/* The preceding attribute is necessary on targets with

 +   BIGGEST_ALIGNMENT <= 32 to trigger the warning, as otherwise a 32 bit

 +   offset is split into DECL_FIELD_OFFSET 4 and DECL_FIELD_BIT_OFFSET 0,

 +   and then there is no discrepancy between DECL_FIELD_OFFSET and

 +   byte_position to warn about.  */