Re: D_GNU_SOURCE option for gcc?

[Henry Lenzi <synthespian@uol.com.br>]

stephen parkinson <stephen <at> zmemw16.demon.co.uk> writes:

> 
> Thomas H. George wrote:
> 
> > I am using source code from UNIX SYSTEMS PROGRAMMING by Robbins & 
> > Robbins.  It gives a compiler error unless compiled with the option 
> > -D_GNU_SOURCE .
> > Where does this option come from - its not in the man pages?  Why is 
> > it needed when using the Debian gcc and g++ packages?
> >
> > Curious,
> >
> > Tom
> >
> >
> >
> 30sec google search suggests it should perhaps be
> 
> -DGNU_SOURCE
> 
 No, it should not.
 gcc -D_GNU_SOURCE hello.c 
means the compiler will use the GNU standard of compilation, the superset of all
other standards under GNU C libraries.
 gcc -g -D_GNU_SOURCE hello.c -o hello 
 is better, because it will provide nice info when debugging.

 The op should get a beginner's book on programming win GNU/Linux.

 Cheers,

 Henry