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Re: [Help-glpk] Linking errors when using cfg.h in a MacOs X


From: Jose Walteros
Subject: Re: [Help-glpk] Linking errors when using cfg.h in a MacOs X
Date: Wed, 18 Jun 2014 00:26:28 -0500

Dear Heinrich,

Thank you for your early response. I just checked the paths and the version and it is 4.54, which is the one I am actually using. 

The same goes for the path to /src/cglib, It points to the 4.54. 

Is there anything else that might be happening?

Thanks

On Jun 17, 2014, at 11:50 PM, "Heinrich Schuchardt" <address@hidden> wrote:

Hello Jose,

The errors you report look like you are linking to an old version of GLPK which does not contain the library function you want to use,

You could check the output of glp_version.

You can influence the library loadpath on OS X by exporting DYLD_LIBRARY_PATH.


Best regards

Heinrich Schuchardt

http://www.xypron.de



Jose L Walteros <address@hidden> schrieb:
Hi all, 

I tried to send this before and I think it didn't work. I am sorry if you receive it again.

I have been working on a code for a while that uses the conflict graph libraries of GLPK. The code compiles perfectly in a Linux machine. However, when I try to compile it on a MacOS X (via the console) I get some linking errors. 

To give you an idea of my problem, I attached bellow a makefile and two trivial applications: main1.cpp is an application that reads clique4.lp, generates the conflict graph, and prints the number of vertices of such graph. As I mentioned, the code compiles perfectly in Linux using the same makefile (after updating the corresponding paths). In MacOS X, I get the following error:

-----------------------------------------
Undefined symbols for architecture x86_64:
  "__glp_cfg_build_graph", referenced from:
      _main in main1-5183c5.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)
make: *** [main1] Error 1
-----------------------------------------

To make sure there was no issues with the installation of GLPK or the path to the libraries, I created main2.cpp, which is an applications that simply reads and solves clique4.lp. Contrary to the previous case, main2.cpp compiles and runs perfectly.

I have tried many things, but I haven't been able to make it work. I hope you guys can help.

Regards, 

Attachments:

-----------------------------------------
main1.cpp
-----------------------------------------
#include <iostream>
extern "C" {
#include <glpk.h>
#include "cfg.h"
    #include "env.h"
    #include "prob.h"
}

int main(int argc, const char * argv[])
{
    glp_prob *P;
CFG *G;
int nV, v, u, degree;

    P = glp_create_prob();
glp_read_lp(P, NULL, "./clique4.lp");
G = cfg_build_graph(P); 

nV = G->nv;

std::cout<<"# vertices: "<<nV<<std::endl;

int *ref = G->ref;
int *neg = G->neg;
int *pos = G->pos;

for (v = 1; v <= nV; v++){  
std::cout<<"vertex "<<v<<" --> variable "<<ref[v]<<"\n";
std::cout<<" pos "<<pos[ref[v]]<<" neg "<<neg[ref[v]]<<"\n";
}

    return 0;
}
-----------------------------------------
main2.cpp
-----------------------------------------

#include <iostream>
extern "C" {
#include <glpk.h>
}

int main(int argc, const char * argv[])
{
    glp_prob *P;

    P = glp_create_prob();
glp_read_lp(P, NULL, "./clique4.lp");
    glp_simplex(P, NULL);

    return 0;
}
-----------------------------------------
Makefile
-----------------------------------------

CPP          = g++
ARGS         = -m64 -g
GLPKPATH     = /Users/jwalteros/Applications/GLPK/glpk-4.54
GLPKLIBPATH  = /usr/local
GLPK         = $(GLPKLIBPATH)/include/
GLPKSRC      = $(GLPKPATH)/src/
GLPKCGLIB    = $(GLPKPATH)/src/cglib/
GLPKENV      = $(GLPKPATH)/src/env/
GLPKMISC     = $(GLPKPATH)/src/misc/
LIBGLPK      = $(GLPKLIBPATH)/lib/

all: main1 main2

main1:
$(CPP) $(ARGS) -o main1 main1.cpp -I$(GLPK) -I$(GLPKSRC) -I$(GLPKCGLIB) \
-I$(GLPKENV) -I$(GLPKENV) -I$(GLPKMISC) -L$(LIBGLPK) -lglpk

main2:
$(CPP) $(ARGS) -o main2 main2.cpp -I$(GLPK) -L$(LIBGLPK) -lglpk

-----------------------------------------
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