[Bug bootstrap/98414] [11 Regression] UBSAN bootstrap is broken: ubsan/ubsan_type_hash_itanium.cpp:162: undefined reference to `__dynamic_cast' since r11-6083-gb7dfc2074c78415d451eb34d1608016c80b1c41a

[marxin at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98414

--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
I replaced cp/mapper-client.o cp/mapper-resolver.o just with:

$ cat mapper-resolver.ii
namespace Cody {
enum class Flags : unsigned;
class Resolver {
  virtual int IncludeTranslateRequest(int *s, Flags flags, int &include);
};
}  // namespace Cody
class module_resolver : public Cody::Resolver {
  virtual int IncludeTranslateRequest(int *s, Cody::Flags,
                                      int &include) override;

 private:
};
int module_resolver::IncludeTranslateRequest(int *s, Cody::Flags,
                                             int &include) {}

which needs the symbol:

nm mapper-resolver.o
...
                 U _ZTVN10__cxxabiv120__si_class_type_infoE

Jakub: Does it confirm your description. Do you know how to fix that?