I would advise to put -ljingjing after main.cpp:
g++ -o test.exe -L/usr/lib -L/home/test test.cpp -ljingjing
----
Lev Assinovsky
Aelita Software Corporation
(now is a part of Quest Software)
O&S InTrust Framework Division, Team Leader
ICQ# 165072909
> -----Original Message-----
> From: Ramin NIkaeen [mailto:Rnikaeen@xxxxxxxxxxxx]
> Sent: Wednesday, April 21, 2004 7:00 PM
> To: gcc-help@xxxxxxxxxxx
> Subject: simple linking question
>
>
>
> Friends,
>
> I am having linking problems with user-generated libraries on
> my Redhat 7.2
> using gcc-3.3.
>
> To demonstrate the problem, I created the following simple example:
>
> /*
> --------------------------------------------------------------
> --------------------------------------------------------------
> FILE: /home/test/jingjing.hpp
> --------------------------------------------------------------
> -------------------------------------------------------------- */
>
> #ifndef JINGJING_H
> #define JINGJING_H
>
> void jingjing();
>
> #endif
>
> /*
> --------------------------------------------------------------
> --------------------------------------------------------------
> FILE: /home/test/jingjing.cpp
> --------------------------------------------------------------
> -------------------------------------------------------------- */
> #include "jingjing.hpp"
> #include <stdio.h>
>
> void jingjing()
> {
> fprintf(stderr, "jingjing invoked!\n");
> }
>
> /*
> --------------------------------------------------------------
> --------------------------------------------------------------
> FILE: test.cpp
> --------------------------------------------------------------
> -------------------------------------------------------------- */
> #include "jingjing.hpp"
>
> int main()
> {
>
> jingjing();
>
> return 0;
> }
>
> --------------------------------------------------------------
> -----------------------------------------------------------------
> compilation and linking
> --------------------------------------------------------------
> -----------------------------------------------------------------
> /home/test>g++ -g -O2 -c jingjing.cpp -o jingjing.o
> /home/test>ar cru libjingjing.a jingjing.o
> /home/test>ranlib libjingjing.a
> /home/test>chmod 755 *.o *.a
> /home/test>g++ -o test.exe -L/usr/lib -L/home/test
> -ljingjing test.cpp
>
> At the linking stage, when I execute the last command shown
> on the last line (g++ -o test.exe ....),
> I get the following error:
> --------------------------------------------------------------
> -----------------------------------------------------------------
> /tmp/ccuw3cNo.o: In function `main':
> /tmp/ccuw3cNo.o(.text+0x11): undefined reference to `jingjing()'
> collect2: ld returned 1 exit status
> --------------------------------------------------------------
> -----------------------------------------------------------------
>
> when I try
> /home/test>g++ jingjing.o test.cpp
> it generates the executable properly.
>
> but when I try
> /home/test>g++ libjingjing.a test.cpp
> I get the same error.
>
> Can someone tell me what is wrong?!
>
>
> thanks so much
>
> ramin
>
>
>
>
