From help-octave-request at bevo dot che dot wisc dot edu Tue Jan 21 10:23:59 2003
Subject: Re: Library libg2c leads double definition of main routine.
From: <mwollenw at cs dot loyola dot edu>
To: Kohei Taki <k-taki at ist dot osaka-u dot ac dot jp>
cc: "help-octave at bevo dot che dot wisc dot edu" <help-octave@bevo.che.wisc.edu>,    jwe@bevo.che.wisc.edu
Date: Tue, 21 Jan 2003 11:22:24 -0500 (EST)

I'm having similar problems. Where can i find documentation on using
octave in C/C++ programs?


---------------------------
Matthew Wollenweber       
mwollenw at cs dot loyola dot edu

On Mon, 20 Jan 2003, Kohei Taki wrote:

> 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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> 
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