How to get associated function names with the imported library - linux

Question

if i have an ELF file, how can i get each functions imported from a library file ".so" , displaying that shared library associated with the function ?

Answer 1

This works nicely for me:
nm -uC test
E.g. on the code from this other answer I just wrote:
g++ -O0 -I ~/custom/boost/ test.cpp -o test
nm -uC test
The output is
w _Jv_RegisterClasses
U _Unwind_Resume##GCC_3.0
U std::string::compare(std::string const&) const##GLIBCXX_3.4
U std::allocator<char>::allocator()##GLIBCXX_3.4
U std::allocator<char>::~allocator()##GLIBCXX_3.4
U std::ostream::operator<<(std::ostream& (*)(std::ostream&))##GLIBCXX_3.4
U std::ostream::operator<<(int)##GLIBCXX_3.4
U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(char const*, std::allocator<char> const&)##GLIBCXX_3.4
U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string(std::string const&)##GLIBCXX_3.4
U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string()##GLIBCXX_3.4
U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()##GLIBCXX_3.4
U std::ios_base::Init::Init()##GLIBCXX_3.4
U std::ios_base::Init::~Init()##GLIBCXX_3.4
U std::__throw_bad_alloc()##GLIBCXX_3.4
U std::_Rb_tree_decrement(std::_Rb_tree_node_base const*)##GLIBCXX_3.4
U std::_Rb_tree_decrement(std::_Rb_tree_node_base*)##GLIBCXX_3.4
U std::_Rb_tree_increment(std::_Rb_tree_node_base const*)##GLIBCXX_3.4
U std::_Rb_tree_increment(std::_Rb_tree_node_base*)##GLIBCXX_3.4
U std::_Rb_tree_insert_and_rebalance(bool, std::_Rb_tree_node_base*, std::_Rb_tree_node_base*, std::_Rb_tree_node_base&)##GLIBCXX_3.4
U std::basic_ostream<char, std::char_traits<char> >& std::endl<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&)##GLIBCXX_3.4
U std::basic_ostream<char, std::char_traits<char> >& std::operator<< <char, std::char_traits<char>, std::allocator<char> >(std::basic_ostream<char, std::char_traits<char> >&, std::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)##GLIBCXX_3.4
U operator delete(void*)##GLIBCXX_3.4
U operator new(unsigned long)##GLIBCXX_3.4
U __cxa_atexit##GLIBC_2.2.5
U __cxa_begin_catch##CXXABI_1.3
U __cxa_end_catch##CXXABI_1.3
U __cxa_rethrow##CXXABI_1.3
w __gmon_start__
U __gxx_personality_v0##CXXABI_1.3
U __libc_start_main##GLIBC_2.2.5
U memmove##GLIBC_2.2.5
w pthread_cancel
I'm somewhat aware of the deficiency that this doesn't say which shared object should fulfil the dependency, but I guess a little join on the output of nm for those libraries should take you a long way.
Drop the -C flag to prevent name demangling. This could be highly effective if you intend to do a crossreference on the data. Use c++filt to demangle names later, in case you want to present the names in user-friendly fashion