$ find . -name *.a | xargs nm -C -g | grep "std::allocator<char>"
         U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()
         U std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(unsigned int, char)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(unsigned int, char, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string&&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string&&, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&, unsigned int, unsigned int, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&, unsigned int, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::initializer_list<char>)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::initializer_list<char>, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::basic_string_view<char, std::char_traits<char> >)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::basic_string_view<char, std::char_traits<char> >, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(unsigned int, char)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(unsigned int, char, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string&&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string&&, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, unsigned int, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&, unsigned int, unsigned int, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&, unsigned int, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::initializer_list<char>)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::initializer_list<char>, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::basic_string_view<char, std::char_traits<char> >)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::basic_string_view<char, std::char_traits<char> >, std::allocator<char> const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(char const*, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)
00000001 W std::basic_string<char, std::char_traits<char>, std::allocator<char> > std::operator+<char, std::char_traits<char>, std::allocator<char> >(std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, char const*)
         U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)
         U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()