[Bug lto/87906] New: [9 Regression] ICE in tree check: expected block, have function_decl in block_ultimate_origin, at tree.c:12326 since r264734

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87906

            Bug ID: 87906
           Summary: [9 Regression] ICE in tree check: expected block, have
                    function_decl in block_ultimate_origin, at
                    tree.c:12326 since r264734
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: marxin at gcc dot gnu.org
  Target Milestone: ---

Following 2 files cause an ICE:

$ cat 1.ii
namespace com {
namespace sun {
namespace star {}
} // namespace sun
} // namespace com
namespace a = com::sun::star;
namespace com {
namespace sun {
namespace star {
namespace uno {
class b {
public:
  ~b();
};
class c {
  b e;
};
class RuntimeException : c {};
} // namespace uno
} // namespace star
} // namespace sun
} // namespace com
template <typename> void d(int) { throw a::uno::RuntimeException(); }
int f;
void g() { d<a::uno::b>(f); }

$ cat 2.ii
namespace com {
namespace sun {
namespace star {
namespace uno {
class a {
public:
  ~a();
};
class b {
  a c;
};
class RuntimeException : b {};
} // namespace uno
class C : uno::RuntimeException {};
} // namespace star
} // namespace sun
} // namespace com
using com::sun::star::C;
using com::sun::star::uno::RuntimeException;
void d() { throw RuntimeException(); }
void e() { C(); }

$ g++ [12].ii -O -shared -fPIC -flto
1.ii:11:7: warning: type ‘struct b’ violates the C++ One Definition Rule
[-Wodr]
   11 | class b {
      |       ^
1.ii:11:7: note: a different type is defined in another translation unit
2.ii:10:5: note: the first difference of corresponding definitions is field ‘c’
   10 |   a c;
      |     ^
1.ii:11:7: note: a type with different number of fields is defined in another
translation unit
   11 | class b {
      |       ^
1.ii:18:7: warning: type ‘struct RuntimeException’ violates the C++ One
Definition Rule [-Wodr]
   18 | class RuntimeException : c {};
      |       ^
1.ii:18:7: note: a type with different bases is defined in another translation
unit
during GIMPLE pass: optimized
2.ii: In function ‘e’:
2.ii:21:6: internal compiler error: tree check: expected block, have
function_decl in block_ultimate_origin, at tree.c:12326
   21 | void e() { C(); }
      |      ^
0x7d56a6 tree_check_failed(tree_node const*, char const*, int, char const*,
...)
        /home/marxin/Programming/gcc/gcc/tree.c:9544
0x7dca31 tree_check(tree_node*, char const*, int, char const*, tree_code)
        /home/marxin/Programming/gcc/gcc/tree.h:3118
0x7dca31 block_ultimate_origin(tree_node const*)
        /home/marxin/Programming/gcc/gcc/tree.c:12324
0x184709b inlined_polymorphic_ctor_dtor_block_p(tree_node*, bool)
        /home/marxin/Programming/gcc/gcc/ipa-polymorphic-call.c:516
0x2a06f91 remove_unused_scope_block_p
        /home/marxin/Programming/gcc/gcc/tree-ssa-live.c:420
0x2a074a5 remove_unused_scope_block_p
        /home/marxin/Programming/gcc/gcc/tree-ssa-live.c:516
0x2a074a5 remove_unused_scope_block_p
        /home/marxin/Programming/gcc/gcc/tree-ssa-live.c:516
0x2a0f17e remove_unused_locals()
        /home/marxin/Programming/gcc/gcc/tree-ssa-live.c:896
0x1e65964 execute_function_todo
        /home/marxin/Programming/gcc/gcc/passes.c:1920
0x1e6709e execute_todo
        /home/marxin/Programming/gcc/gcc/passes.c:1996