gcc/testsuite/gcc.dg/Wcxx-compat-22.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-Wc++-compat" } */
   3 struct A {}; /* { dg-warning "empty struct has size 0 in C" } */
   4 union B {}; /* { dg-warning "empty union has size 0 in C" } */
   5 struct C { struct D {}; int x; }; /* { dg-warning "empty struct has size 0 in C|declaration does not declare anything" } */
   6 struct E { union F {}; int x; }; /* { dg-warning "empty union has size 0 in C|declaration does not declare anything" } */
   7 union G { union H {}; int x; }; /* { dg-warning "empty union has size 0 in C|declaration does not declare anything" } */
   8 union I { struct J {}; int x; }; /* { dg-warning "empty struct has size 0 in C|declaration does not declare anything" } */