From help-octave-request at bevo dot che dot wisc dot edu Mon Jan 20 17:38:18 2003
Subject: Library libg2c leads double definition of main routine.
From: Kohei Taki <k-taki at ist dot osaka-u dot ac dot jp>
To: "help-octave at bevo dot che dot wisc dot edu" <help-octave@bevo.che.wisc.edu>
Date: Mon, 20 Jan 2003 16:59:14 -0600

Hello.

I want to use octave as class library for C++.
But, using compiler link option for libg2c leads me below error.
  % g++ -I/usr/include/octave-2.1.35/ -L/usr/lib/octave-2.1.35 -loctave -lcruft \
        -loctinterp -lreadline -lcurses -llapack -lblas -ldl -lg2c \
        -L/home/pippin/name/.redhat/SOURCES/octave-2.1.35/kpathsea -lkpathsea \
        hello.cpp
  /usr/lib/gcc-lib/i386-redhat-linux/2.96/libg2c.a(main.o)(.text+0x0): first defined here
  /usr/bin/ld: Warning: size of symbol `main' changed from 58 to 174 in /tmp/ccvCth5v.o
  collect2: ld returned 1 exit status
  %
The compiler tell me that main routine already defined at libg2c.
I use strings command for libg2c.
  % strings /usr/lib/gcc-lib/i386-redhat-linux/2.96/libg2c.a | grep main
  main
  main.o/	101865......
  main.c
  main
  %
It is true what the compiler said,
how have you solve this problem ?
The C++ source code expresses following simple logic.
  ==========begin hello.cpp=============
  #include<iostream>
  #include<octave/config.h>
  #inlcude<octave/Matrix.h>
  int main() {
    Matrix m(2, 2, 1.0);
    cout << "hello octave !" << endl < m;
    return 0;
  }
  ==========end hello.cpp===============

Please give me advises to overcome this error message.

----
Kohei Taki  k-taki at ics dot es dot osaka-u dot ac dot jp



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