../boost/smart_ptr/make_shared_object.hpp:55:13: warning: destructor called on non-final 'single_derived' that has virtual functions but non-virtual destructor [-Wdelete-non-abstract-non-virtual-dtor]
../boost/smart_ptr/make_shared_object.hpp:55:17: note: qualify call to silence this warning
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/ext/new_allocator.h:152:4: warning: destructor called on non-final 'single_derived' that has virtual functions but non-virtual destructor [-Wdelete-non-abstract-non-virtual-dtor]
/usr/bin/../lib/gcc/x86_64-linux-gnu/9/../../../../include/c++/9/ext/new_allocator.h:152:10: note: qualify call to silence this warning
2 warnings generated.