Geek Answers Handbook

Undefined reference to a function declared in a * .h file

I am an unskilled programmer and new to Linux, I encounter a problem when I complicate. I have two files "ex_addinst.c" and "lindo.h" in the same folder, I entered the command:

g++ -c ex_addinst.c

then the object file ex_addinst.o will be generated with a warning:

ex_addinst.c: In function ‘int main()’:
ex_addinst.c:80: warning: deprecated conversion from string constant to ‘char*’

then I leak them with

g++ -Wall -o ex_addinst ex_addinst.o

and get the following information:

ex_addinst.o: In function `main':
ex_addinst.c:(.text+0x2b): undefined reference to `LSloadLicenseString'
ex_addinst.c:(.text+0x75): undefined reference to `LSgetVersionInfo'
ex_addinst.c:(.text+0xae): undefined reference to `LScreateEnv'
ex_addinst.c:(.text+0x10a): undefined reference to `LSgetErrorMessage'
...
...
ex_addinst.c:(.text+0x1163): undefined reference to `LSdeleteEnv'
collect2: ld returned 1 exit status

I assume the header file 'lindo.h' is not executed in the .o file, but I have no idea what to do now. I tried gcc but getting the same error. the version of my g ++ and gcc is 4.4.5. I am using Ubuntu 10.10.

All functions and structures were declared in 'lindo.h'.

The ex_addinst.c part is as follows:

    #include <stdio.h>
    #include <stdlib.h>
    /* LINDO API header file */
    #include "lindo.h"
        enter code here
int CALLTYPE LSwriteMPIFile(pLSmodel pModel,
                             char     *pszFname);


/* Define a macro to declare variables for
    error checking */
#define APIERRORSETUP  \
   int nErrorCode; \
   char cErrorMessage[LS_MAX_ERROR_MESSAGE_LENGTH] \
/* Define a macro to do our error checking */
#define APIERRORCHECK  \
   if (nErrorCode) \
   { \
      if ( pEnv) \
      { \
         LSgetErrorMessage( pEnv, nErrorCode, \
          cErrorMessage); \
         printf("nErrorCode=%d:  %s\n", nErrorCode, \
          cErrorMessage); \
      } else {\
         printf( "Fatal Error\n"); \
      } \
      exit(1); \
   } \

#define APIVERSION \
{\
    char szVersion[255], szBuild[255];\
    LSgetVersionInfo(szVersion,szBuild);\
    printf("\nLINDO API Version %s built on %s\n",szVersion,szBuild);\
}\
/* main entry point */
int main()
{
   APIERRORSETUP;
   pLSenv pEnv;
   pLSmodel pModel;
   char MY_LICENSE_KEY[1024];

 /*****************************************************************
  * Step 1: Create a model in the environment.
  *****************************************************************/
   nErrorCode = LSloadLicenseString("home/li/work/tools/lindo/lindoapi/license/lndapi60.lic", MY_LICENSE_KEY);
   if ( nErrorCode != LSERR_NO_ERROR)
   {
      printf( "Failed to load license key (error %d)\n",nErrorCode);
      exit( 1);
   }
......
......
......
   APIERRORCHECK;
   {
      int nStatus;
      double objval=0.0, primal[100];
      /* Get the optimization result */
      nErrorCode = LSgetInfo(pModel, LS_DINFO_GOP_OBJ, &objval);
      APIERRORCHECK;
      LSgetMIPPrimalSolution( pModel, primal) ;
      APIERRORCHECK;
      printf("\n\nObjective = %f \n",objval);
      printf("x[0] = %f \n",primal[0]);
      printf("x[1] = %f \n",primal[1]);
      /* Get the linearity of the solved model */
      nErrorCode = LSgetInfo (pModel, LS_IINFO_GOP_STATUS, &nStatus);
      APIERRORCHECK;
      /* Report the status of solution */
      if (nStatus==LS_STATUS_OPTIMAL || nStatus==LS_STATUS_BASIC_OPTIMAL)
      printf("\nSolution Status: Globally Optimal\n");
      else if (nStatus==LS_STATUS_LOCAL_OPTIMAL)
      printf("\nSolution Status: Locally Optimal\n\n");
      else if (nStatus==LS_STATUS_INFEASIBLE)
      printf("\nSolution Status: Infeasible\n\n");
   }

 /* >>> Step 7 <<< Delete the LINDO environment */
   LSdeleteEnv(&pEnv);

  /* Wait until user presses the Enter key */
   printf("Press <Enter> ...");
   getchar();
}

part of "lindo.h":

/*********************************************************************
 * Structure Creation and Deletion Routines (4)                      *
 *********************************************************************/

 pLSenv CALLTYPE LScreateEnv(int     *pnErrorcode,
                             char    *pszPassword);

 pLSmodel CALLTYPE LScreateModel(pLSenv pEnv,
                             int     *pnErrorcode);

 int CALLTYPE LSdeleteEnv(pLSenv *pEnv);


 int CALLTYPE LSdeleteModel(pLSmodel *pModel);


 int CALLTYPE LSloadLicenseString(char *pszFname, char *pachLicense);

 void CALLTYPE LSgetVersionInfo(char *pachVernum, char    *pachBuildDate);

Thank!

, , . , , . :

gcc -o ex_addinst  ./ex_addinst.o -L/home/li/work/tools/lindo/lindoapi/bin/linux64 -m64 -llindo64  -lmosek64 -lconsub3 -lc -ldl -lm -lguide -lpthread -lsvml -limf -lirc

ex_addinst: :

./ex_addinst

:

./ex_addinst: error while loading shared libraries: liblindo64.so.6.0: cannot open shared object file: No such file or directory

: liblindo64.so.6.0 lib, :

libconsub3.so  libirc.so          liblindojni.so        libmosek64.so.5.0  lindo.par
libguide.so    liblindo64.so      liblindojni.so.6.0.3  libsvml.so         placeholder
libimf.so      liblindo64.so.6.0  libmosek64.so         lindoapivars.sh    runlindo

liblindo64.so.6.0 liblindo64.so

ln -sf liblindo64.so.6.0 liblindo64.so

.

- , ?

( , , , )

+5
4

, lindo.h , , ? C, .

, .

, , , g++ - .. . .

+13

g++ -Wall -o ex_addinst ex_addinst. c

g++ -Wall -o ex_addinst ex_addinst.o

.c, .o.

+1

gcc , LS..., . , , , .

+1

undefined reference to ... . , (), .
Limbo API , , : .
EDIT: , , Linux. -L/-L g++. man g++ , Limbo .

0

More articles:


All Articles