From: Richard Dawe <rich AT phekda DOT freeserve DOT co DOT uk>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: error while linking using GMP library
Date: Tue, 25 Jun 2002 20:19:33 +0100
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

Hello.

Andrew wrote:
[snip]
> The command line options I am using are as follows:
> 
> ---
> C:\test>gpp bignum.cpp -o bignum.exe -lgmp
> ---
> 
> I get this error:
> 
> ---
> c:/djgpp/tmp\ccaIkv3J.o(.gnu.linkonce.t._ZlsRSoRK10__gmp_exprI12__gmpz_valueS1_E
> +0x1c):bignum.cpp: undefined reference to `operator<<(std::ostream&,
> __mpz_struc
> t const*)'
> 
> collect2: ld returned 1 exit status
> ---
> 
> Anyone know what may be causing this?  It seems like the linker can't
> find the standard library...  Thanks!

Actually I think the linker cannot find an appropriate operator<< to output
__mpz_structs to a std::ostream. I expect that this function is in libgmpxx.a.
Try linking in libgmpxx.a (the C++ part of the GMP library):

    gpp bignum.cpp -o bignum.exe -lgmp -lgmpxx

Hope that helps, regards,

-- 
Richard Dawe [ http://www.phekda.freeserve.co.uk/richdawe/ ]