[Buildroot] __USE_GNU ?

Baruch Siach baruch at tkos.co.il
Thu Mar 3 09:28:56 UTC 2011


Hi Guillaume,

On Thu, Mar 03, 2011 at 10:19:44AM +0100, Guillaume Dargaud wrote:
> Hello all,
> I'm trying to compile some code that uses splice/vmplice and I get:
> TestSockets.c:85: error: 'SPLICE_F_GIFT' undeclared (first use in this function)
> TestSockets.c:86: error: 'SPLICE_F_MOVE' undeclared (first use in this function)
> 
> I use #include <fcntl.h> in my code which includes output/host/usr/powerpc-unknown-linux-
> uclibc/sysroot/usr/include/bits/fcntl.h
> where I see the two corresponding defines for SPLICE_F_*, but the conditional macro __USE_GNU is not defined.
> 
> A quick googling tell me it's an internal macro to uclibc, so why is it not on ?
> How do I get those two macros ?
> 
> Sure, I can define them by hand, but something's fishy.
> 
> Thanks for the clarification.

Make sure to define _GNU_SOURCE before including any header.

baruch

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