https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96946
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't know what the problem is, the code should be roughly equivalent to:
#include <new>
namespace x __attribute__((visibility("default")))
{
template<typename T>
struct buffer
{
alignas(__alignof__(T)) unsigned char buf[sizeof(T)];
void* addr() { return static_cast<void*>(buf); }
T* ptr() { return static_cast<T*>(addr()); }
};
}
struct IReporterFactory {
virtual ~IReporterFactory() = default;
};
class ReporterFactory : public IReporterFactory {};
int main()
{
auto p = new x::buffer<ReporterFactory>;
::new(p->addr()) ReporterFactory;
p->ptr()->~ReporterFactory();
delete p;
}
And clang has no problem with that (as expected).
Is it normal for cfi-unrelated-cast to just trap on a UD2 instruction, rather
than giving a UBsan diagnostic?
