Thread

1. libpq++ linking

   Vazsonyi Peter[ke] <neko@kornel.szif.hu> — 1998-01-22T17:51:01Z

   Hello!
   
   I try to use libpq++ (linux: redhat4.2, postgresql-(devel)?-6.2 GNU c)
   And i have problem with linking:
   
   [root@3dom neko]# g++ -I/usr/include/postgres/ -lpq++ -o a a.cc 
   /tmp/cca032541.o: In function 
   ain':
   /tmp/cca032541.o(.text+0x22): undefined reference to gConnection::Exec(char
   const *)'
   ...
   And more like this. But where is this famous exec?
   
   [root@3dom neko]# nm -C /usr/lib/libpq++.a | grep 'Exec(char'
   00000348 T PgConnection::Exec(char const *)
            U PgConnection::Exec(char const *)
   
   All right. In libpq++.
   And I use this lib?
   [root@3dom neko]# mv /usr/lib/libpq++.a .    
   [root@3dom neko]# g++ -I/usr/include/postgres/ -lpq -lpq++ -o e e.cc 
   ld: cannot open -lpq++: No such file or directory
   Yes. We were use before this.
   And include-s is too works.
   
   My first program:
   --------	x	--------
   #include <postgres/libpq++.h>
   #ifndef PGDATABASE_H
     main(){;};
   #else // PGDATABASE_H
   #include <iostream.h>
   main(){
           ExecStatusType XStat;
           PgDatabase conn("tval");
           XStat=conn.Exec("select oid from szak order by oid ;");
           for (int i=0,max=conn.Tuples();max>i;i++) {
                   cout << conn.GetValue(i,0) << endl;
           }
   }
   #endif // PGDATABASE_H
   --------	x	--------
   
   I mean, i try all what i can. But somewhere i must done a mistake. 
   BUT where?!
   
   Please help me...
   
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   "Petike"         (_Y_.)'  ._   )  `._ `. ``-..-'     line:3
   /* Neko */     _..`--'_..-_/  /--'_.' ,'             Before /*Neko*/
    );           (il),-''  (li),'  ((!.-'
   
   
   

2. Re: [HACKERS] libpq++ linking

   Maarten Boekhold <maartenb@dutepp0.et.tudelft.nl> — 1998-01-22T20:22:20Z

   On Thu, 22 Jan 1998, Vazsonyi Peter[ke] wrote:
   
   > Hello!
   > 
   > I try to use libpq++ (linux: redhat4.2, postgresql-(devel)?-6.2 GNU c)
   > And i have problem with linking:
   > 
   > [root@3dom neko]# g++ -I/usr/include/postgres/ -lpq++ -o a a.cc 
   > /tmp/cca032541.o: In function ain':
   > /tmp/cca032541.o(.text+0x22): undefined reference to gConnection::Exec(char
   > const *)'
   > ...
   > And more like this. But where is this famous exec?
   > 
   > [root@3dom neko]# nm -C /usr/lib/libpq++.a | grep 'Exec(char'
   > 00000348 T PgConnection::Exec(char const *)
   >          U PgConnection::Exec(char const *)
   > 
   > All right. In libpq++.
   > And I use this lib?
   > [root@3dom neko]# mv /usr/lib/libpq++.a .    
   > [root@3dom neko]# g++ -I/usr/include/postgres/ -lpq -lpq++ -o e e.cc 
   > ld: cannot open -lpq++: No such file or directory
   > Yes. We were use before this.
   
   Try putting the -lpq++ *after* your input files, ie. last on the line.
   
   Maarten
   
   _____________________________________________________________________________
   |     Maarten Boekhold, Faculty of Electrical Engineering TU Delft,   NL    |
   |           Computer Architecture and Digital Technique section             |
   |                          M.Boekhold@et.tudelft.nl                         |
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