Re: [Boost-users] MPFR in Boost 1.45.0

Subject: Re: [Boost-users] MPFR in Boost 1.45.0
From: Novak Elliott (n.s.j.elliott_at_[hidden])
Date: 2011-02-01 06:01:06

Yes, you're right.  The object file is compiled ok:

g++ -I/path/to/boost_1_45_0 -lgmpfrxx -lmpfr  -lgmpxx -lgmp -c
boost_mpfr_example.cpp

but linking fails in building the executable:

g++ -I/path/to/boost_1_45_0 -lgmpfrxx -lmpfr  -lgmpxx -lgmp
boost_mpfr_example.o -o boost_mpfr_example

Actually, simply including <boost/math/bindings/mpfr.hpp> gives the
following three errors (i.e. commented out the contents of main):

boost_mpfr_example.o: In function `MpFrC::get_base()':
boost_mpfr_example.cpp:(.text._ZN5MpFrC8get_baseEv[MpFrC::get_base()]+0x6):
undefined reference to `MpFrC::base'
boost_mpfr_example.o: In function `MpFrC::get_rnd()':
boost_mpfr_example.cpp:(.text._ZN5MpFrC7get_rndEv[MpFrC::get_rnd()]+0x6):
undefined reference to `MpFrC::rnd'
boost_mpfr_example.o: In function `std::basic_istream<char,
std::char_traits<char> >& operator>><__mpfr_struct
[1]>(std::basic_istream<char, std::char_traits<char> >&,
__gmp_expr<__mpfr_struct [1], __mpfr_struct [1]>&)':
boost_mpfr_example.cpp:(.text._ZrsIA1_13__mpfr_structERSiS2_R10__gmp_exprIT_S4_E[std::basic_istream<char,
std::char_traits<char> >& operator>><__mpfr_struct
[1]>(std::basic_istream<char, std::char_traits<char> >&,
__gmp_expr<__mpfr_struct [1], __mpfr_struct [1]>&)]+0x2a): undefined
reference to `operator>>(std::basic_istream<char, std::char_traits<char> >&,
__mpfr_struct*)'
collect2: ld returned 1 exit status

I have MPFR 3.0.0-2 (ubuntu packages: libmpfr-dev, libmpfr4), gmp 4.3.2
(libgmp3-dev, libgmp3c2, libgmpxx4ldbl), and gmpfrxx (
http://math.berkeley.edu/~wilken/code/gmpfrxx/).  I note that gmpfrxx was
"Last updated 2008/11/16 to incorporate new features of MPFR 2.3.*"

Has anyone got MPFR 3.0.0 working with boost 1.45.0 and if so, what was your
setup?

cheers,
Novak.

On 1 February 2011 09:38, John Maddock <boost.regex_at_[hidden]> wrote:

> I get a large number of compile errors (attached).
>>
>
> Those are all linker errors not compiler errors - are you linking to the
> correct libraries?
>
> HTH, John.
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