Re: shared library - undefined symbols

[Anitha Boyapati <anithab at sankhya dot com>]

On Wed, 6 Dec 2006, Andrew Haley wrote:

> Anitha Boyapati writes:
>  > 
>  >  Please let me know if I am missing something.It is important for
>  >  me to get through this immediately :-(
>  > 
>  >  -------------------------------------------
>  > 
>  >  Sample Code :
>  > 
>  > 	class X : class baseX {
>  > 	...
>  > 	};
>  > 
>  > 	class Y : class baseY {
>  > 	...
>  > 	};
>  > //End of Code
>  > 
>  >  g++ -c -shared -o mem.so X.o Y.o
>  > 
>  >  ( This created mem.so )
>  > 
>  >  When used with dlopen as :
>  > 
>  >  handle = dlopen ("mem.so", RTLD_LAZY)
>  >  
>  >  The above statement throws error saying undefined reference to baseX
>  >  and BaseY!	
> 
> No kidding.  Where are baseX and BaseY defined?

 They are also included while building mem.so.But I got the mistake.
 I didnt define the virtual methods declared in X and Y out of pure 
 ignorance :-)

 Doesnt it sound right if we have some error or warning thrown for such 
 cases where definitions are not found while building a shared library?
 Since it didnt throw anything during build, I thought my lib is as good 
 as any that of experts'!

[ This is my first time to use shared libs and (please close your eyes)
 I dont even know what a shared lib should contain]
 

> 
> Andrew.
> 

-- 
Regards,
Anitha B,
Sankhya Technologies Private Limited.