Problem to link to libsecp256k1 on ARM architecture

0

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;
}

Ben

Posted 2019-09-23T09:17:38.363

Reputation: 245

how you have build the libsecp256k1? – vincenzopalazzo – 2019-09-23T11:47:24.357

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 https://github.com/libbitcoin/libbitcoin-system#building-icu-zlib-png-qrencode-andor-boost

– Ben – 2019-09-23T12:47:54.890

add this to the compile command -lgmp ad rebuild the library – vincenzopalazzo – 2019-09-23T12:50:50.223

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 – 2019-09-23T12:52:42.730

look this issue on github, inside it is the solution

– vincenzopalazzo – 2019-09-23T12:54:29.247

Thanks. The install script is 100% automatic. I start ./install.sh and it finishes after several hours. I am not sure where to add the command. Actually, as you can see, I already appended a message to that closed issue. :) – Ben – 2019-09-23T12:57:36.530

The directories discussed in the issue you linked are probably special to this github project. I can not find them and also not the link.txt. Interestingly, I have the very same error message. Thanks for your input. – Ben – 2019-09-23T13:06:58.430

Answers

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.

elichai2

Posted 2019-09-23T09:17:38.363

Reputation: 111

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 – 2019-09-25T12:36:19.940

0

I could solve the issue by using the --static attribute:

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

Ben

Posted 2019-09-23T09:17:38.363

Reputation: 245

Asked: 2019-09-23T09:17:38.363

Viewed: 41 times

Active: 2019-09-24T20:16:39.413