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Trying to compile with g++ -o addr 69_addr2.cpp $(pkg-config --cflags --libs libbitcoin) is getting me this error:

/usr/bin/ld: /home/pi/libbitcoininstall/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): in function `secp256k1_num_mod_inverse':
/home/pi/GitBen/LibbitcoinBen/build-libbitcoin/secp256k1/src/num_gmp_impl.h:128: undefined reference to `__gmpn_gcdext'
/usr/bin/ld: /home/pi/libbitcoininstall/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): in function `__gmpn_sub':
/usr/include/arm-linux-gnueabihf/gmp.h:2190: undefined reference to `__gmpn_sub_n'
/usr/bin/ld: /home/pi/libbitcoininstall/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): in function `secp256k1_num_set_bin':
/home/pi/GitBen/LibbitcoinBen/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/usr/bin/ld: /home/pi/GitBen/LibbitcoinBen/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/usr/bin/ld: /home/pi/libbitcoininstall/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): in function `secp256k1_num_get_bin':
/home/pi/GitBen/LibbitcoinBen/build-libbitcoin/secp256k1/src/num_gmp_impl.h:34: undefined reference to `__gmpn_get_str'
/usr/bin/ld: /home/pi/libbitcoininstall/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): in function `secp256k1_num_set_bin':
/home/pi/GitBen/LibbitcoinBen/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/usr/bin/ld: /home/pi/GitBen/LibbitcoinBen/build-libbitcoin/secp256k1/src/num_gmp_impl.h:49: undefined reference to `__gmpn_set_str'
/usr/bin/ld: /home/pi/libbitcoininstall/lib/libsecp256k1.a(libsecp256k1_la-secp256k1.o): in function `secp256k1_num_get_bin':
/home/pi/GitBen/LibbitcoinBen/build-libbitcoin/secp256k1/src/num_gmp_impl.h:34: undefined reference to `__gmpn_get_str'
collect2: error: ld returned 1 exit status

Why is there a reference to the build-libbitcoin directory?

I installed libbitcoin in /home/pi/libbitcoininstall and the other directory is just the git where the automatic install script placed all the files.

So, this process should be finished. Why do I even get a print with that directory?

The installation went without error.

I am doing this on a Raspberry (should it matter?)

The small program I try to compile is from a textbook:

#include <bitcoin/bitcoin.hpp>

int main()
{
  bc::ec_secret secret;
  bool success = bc::decode_base16(secret,"038109007313a5807b2eccc082c8c3fbb988a973cacf1a7df9ce725c31v14776");
  assert(success);

  bc::ec_point public_key = bc::secret_to_public_key(secret);
  std::cout << "Public key: " << bc::encode_hex(public_key) << std::endl;

  const bc::short_hash hash = bc::bitcoin_short_hash(public_key);

  bc::data_chunk unencoded_address;
  unencoded_address.reserve(25);
  unencoded_address.push_back(0);
  bc::extend_data(unencoded_address, hash);
  bc::append_checksum(unencoded_address);
  assert(unencoded_address.size() == 25);
  const std::string address = bc::encode_base58(unencoded_address);

  std::cout << "Address: " << address << std::endl;
  return 0;
}
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  • how you have build the libsecp256k1? – vincenzopalazzo Sep 23 '19 at 11:47
  • It is part of the install script install.sh of libbitcoin and the developers there argued that using this is the best method to make sure an installation is done properly. See also github.com/libbitcoin/… – Ben Sep 23 '19 at 12:47
  • add this to the compile command -lgmp ad rebuild the library – vincenzopalazzo Sep 23 '19 at 12:50
  • Could you please elaborate on the subject? Recompiling will take half a day on my Raspberry so I would like to think about it. :) – Ben Sep 23 '19 at 12:52
  • look this issue on github, inside it is the solution – vincenzopalazzo Sep 23 '19 at 12:54
1

It seems like pkg-config found libsecp256k1 in the build-libbitcoin directory. which is part of libbitcoin, so they probably build libsecp25k61 there.

The reason your code doesn't compile is because your libsecp was compiled with libgmp enabled, now this is a dynamic link.
So if you're trying to create a binary here you need to add -lgmp and if it's not in your system libs you'll need to also give a location to the .so file

Another option would be to recompile libsecp with libgmp linking disabled.

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  • Thank you very much for your effort! As I understand libsecp256k1 is a part of libbitcoin (as a fork) and thus build-libbitcoin should probably contain libsecp256k1. Also, when compiling libbitcoin-system I used --disable-shared so there should be no dynamic link, right? – Ben Sep 25 '19 at 12:36
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I could solve the issue by using the --static attribute:

g++ -o addr 69_addr2.cpp $(pkg-config --cflags --libs --static libbitcoin)

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