From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12183 invoked by alias); 7 May 2006 11:56:32 -0000 Received: (qmail 12173 invoked by uid 22791); 7 May 2006 11:56:31 -0000 X-Spam-Check-By: sourceware.org Received: from easeserver.easesoftware.com (HELO easeserver.easesoftware.com) (64.192.143.210) by sourceware.org (qpsmtpd/0.31) with ESMTP; Sun, 07 May 2006 11:56:28 +0000 Received: from [64.192.143.213] (small-fry.easesoftware.com [64.192.143.213]) by easeserver.easesoftware.com (Postfix) with ESMTP id 9C4AA21F444; Sun, 7 May 2006 06:56:26 -0500 (CDT) In-Reply-To: <5b7094580605051429j3b4577c5o7d46dfb7f36fbc17@mail.gmail.com> References: <5b7094580605051429j3b4577c5o7d46dfb7f36fbc17@mail.gmail.com> Mime-Version: 1.0 (Apple Message framework v749.3) Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Message-Id: <6FFD3C7B-3315-4FDE-8C09-508D3979C604@easesoftware.com> Cc: gcc-help Content-Transfer-Encoding: 7bit From: Perry Smith Subject: Re: gcc linking and address of template function Date: Sun, 07 May 2006 11:56:00 -0000 To: Brian Budge X-Mailer: Apple Mail (2.749.3) Mailing-List: contact gcc-help-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-help-owner@gcc.gnu.org X-SW-Source: 2006-05/txt/msg00074.txt.bz2 I may be right in front of my face but I don't see it. Can you send a couple lines of what the link's error messages are like? On May 5, 2006, at 4:29 PM, Brian Budge wrote: > Hi all - > > I'm attempting to use gsl (gnu scientific library) from my C++ > program. gsl is a C program, and I need to pass function pointers to > gsl to make it do it's magic on my data. > > The problem I'm having stems from the fact that I need my functions to > be template functions. > > I can get everything to compile, but I can't get it to link. > > The gist is like this: > > template > int ll_uv_f(const gsl_vector *x, void *params, gsl_vector *f){ > LL_uv_data *lld = static_cast< LL_uv_data* > > (params); > const real a = gsl_vector_get(x,0); > const real b = gsl_vector_get(x,1); > Vec v = lld->ll->eval(a, b) - lld->pt; > for(int i = 0; i < 2; ++i){ > gsl_vector_set(f, i, v[i]); > } > return GSL_SUCCESS; > } > > template > int ll_uv_df(const gsl_vector *x, void *params, gsl_matrix *J){...} > > template > int ll_uv_fdf(const gsl_vector *x, void *params, gsl_vector *f, > gsl_matrix *J){...} > > The calling function then contains the code: > > LL_uv_data dat(Vec(u,v), this); > gsl_multiroot_function_fdf f = {ll_uv_f, > ll_uv_df, > ll_uv_fdf, > 2, &dat}; > > I also explicitly instantiate the template functions for several > instances in a .cc file: > > //explicit instantiation of template functions > template int ll_uv_fdf(const gsl_vector *x, void *params, > gsl_vector *f, gsl_matrix *J); > template int ll_uv_fdf(const gsl_vector *x, void *params, > gsl_vector *f, gsl_matrix *J); > . > . > . > template int ll_uv_df(const gsl_vector *x, void *params, > gsl_matrix *J); > template int ll_uv_df(const gsl_vector *x, void *params, > gsl_matrix *J); > . > . > . > template int ll_uv_f(const gsl_vector *x, void *params, > gsl_vector *f); > template int ll_uv_f(const gsl_vector *x, void *params, > gsl_vector *f); > . > . > . > > The program compiles fine, and the functions int ll_uv_*() are found > by the nm utility to be in a .o file. > > The program still won't link. Anyone have any ideas? Is this > something I'm doing wrong? The gcc version is 3.4.5-r1, and this is > on a xeon box running linux. > > Thanks, > Brian >