Re: help: Undefined reference to '...'

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Article #326

#326

From: Chris Ahlstrom
Date: Fri, 25 May 2001 16:34

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"David. E. Goble" wrote:
> 
> Hi All;
> 
> I have redHat 6.2 (server install)
> 
> I am trying to do some programming.
> 
> Tried these two;
> 
>         gcc testlibpq.c -I/usr/include/pgsql/ -L/usr/lib/
> 
> and
> 
>         gcc cube.cpp -I/usr/X11R6/include/ -L/usr/X11R6/lib/
> 
> both produce a list of;
> 
> .... Undefined reference to '...'
> collect2: ld returned 1 exit status
> 
> I understand this has something to do with linking...
> 
> What am I doing wrong or not doing. Please I need step by step
> instruction, thanks.

Can't give you steps, but it sounds like you're forgetting
to add an explicit reference to a library (*.a) or an object
module (*.o) that contains the definition of the function
or global variable "collect2".  So the linker/loader (ld)
cannot find it.  

    gcc testlibpq.c -I/usr/include/pgsql/ -L/usr/lib/ collect2.o

    gcc testlibpq.c -I/usr/include/pgsql/ -L/usr/lib/ mylibrary.a

I don't know what library/module collect2 would appear in.
Is an SQL thang?

Chris

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