Re: Library libg2c leads double definition of main routine.

[mwollenw]

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


---------------------------
Matthew Wollenweber       
address@hidden

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  address@hidden
> 
> 
> 
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Octave is freely available under the terms of the GNU GPL.

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How to fund new projects:  http://www.octave.org/funding.html
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