gccundefinedldcephcephfs

get "libcephfs.so:undefined reference to 'blablabla' " error during compiler. How to do solve this problem?

I have a cephfs and i'm writing a client code in c language using libcephfs.h library for it.

Note: installed libcephfs-dev and libcephfs2, but did not work on any version(12.2.12 or 12.2.4) I am using ubuntu 18.04.3. 

#include "/usr/include/cephfs/libcephfs.h"
#include <stdlib.h>
#include <stdio.h>

int main (int argc, const char* argv[]){

    struct ceph_mount_info *cmount;

    const char id[] = "client.admin";

    int err = ceph_create(&cmount, id);

    printf("%d", err);

    return 0;
}

$ g++ -o example example.c -lcephfs 

/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `AdminSocket::unregister_command(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `ceph_clock_now()'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `AdminSocket::register_command(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, AdminSocketHook*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `PerfCountersBuilder::add_u64_counter(int, char const*, char const*, char const*, int)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `md_config_t::set_val(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, char const*, bool, std::__cxx11::basic_stringstream<char, std::char_traits<char>, std::allocator<char> >*)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `CrushWrapper::get_full_location_ordered(int, std::vector<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >&)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `PerfCounters::tinc(int, utime_t, unsigned int)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `md_config_t::parse_env()'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `md_config_t::parse_argv(std::vector<char const*, std::allocator<char const*> >&)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `ceph::Formatter::create(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `PerfCounters::tinc(int, std::chrono::duration<unsigned long, std::ratio<1l, 1000000000l> >, unsigned int)'
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/libcephfs.so: undefined reference to `FSMap::parse_role(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, mds_role_t*, std::ostream&) const'
collect2: error: ld returned 1 exit status
Solution

  • It worked ! Before upgrading my ubuntu version(from 16.04 to 18.04), i have installed librados. Now, i reinstall librados and libcephfs. It worked successfully.