Re: D_GNU_SOURCE option for gcc?

[stephen parkinson]

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

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