Re: [boost] gmp-5.1.2 / boost-1.54 / multiprecision lib

Subject: Re: [boost] gmp-5.1.2 / boost-1.54 / multiprecision lib
From: John Maddock (john_at_[hidden])
Date: 2013-07-04 05:19:48

> I'm a bit of a newbie and I ran into some issues using gmp with boost.

You need to add

-lgmp

to the end of your command line, and probably an -L option before that to 
point to the directory containing the gmp library files - please see the GCC 
manual for information on those options.

HTH, John.

> After building gmp-5.1.2, I tried to build a simple file:
> boostMathExample.cpp, based on the documentation (using the multiprecision
> library + referencing gmp):
>
> //////////////////////////////////////////
> #include <boost/multiprecision/gmp.hpp>
>
> using namespace boost::multiprecision;
>
> int main(int argc, const char *argv[])
> {
>  mpz_int v = 1;
>
>  // Do some arithmetic:
>  for (unsigned int i = 1; i <= 1000; ++i)
>     v *= i;
>
>  std::cout << v << std::endl;
> }
> ///////////////////////////////////////////////
>
> I received the following missing symbol errors when trying to build:
>
> g++ -I ~/Dev/C++/gmp-5.1.2 -I ~/Dev/C++/boost boostMathExample.cpp -O2 -o
> boostMathExample
>
> Undefined symbols:
>  "_main", referenced from:
>      start in crt1.10.6.o
>  "___gmpz_init", referenced from:
>      __static_initialization_and_destruction_0(int, int)in cccOFSnR.o
>      __static_initialization_and_destruction_0(int, int)in cccOFSnR.o
>  "___gmpz_clear", referenced from:
>      ___tcf_1 in cccOFSnR.o
>      __static_initialization_and_destruction_0(int, int)in cccOFSnR.o
>  "___gmpz_set_si", referenced from:
>      __static_initialization_and_destruction_0(int, int)in cccOFSnR.o
> ld: symbol(s) not found
> collect2: ld returned 1 exit status
>
> ========================================
> I'm running the following version of g++:
> i686-apple-darwin10-g++-4.2.1 (GCC) 4.2.1 (Apple Inc. build 5666) (dot 3)
>
> I configured gmp, version 5.1.2 with the following flags:
> ./configure --enable-cxx CXX=g++ CXXFLAGS=-O2 CC=g++ CFLAGS="-g -O2"
> and then ran "make" and "make check".
>
>
> Any insight would be appreciated.
>
> Thanks,
> Fred
>
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