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Re: glibc devel info pages

On Wed, Jan 03, 2001 at 04:37:44PM +1100, Brian May wrote:
> >>>>> "Ben" == Ben Collins <bcollins@debian.org> writes:
>     Ben> By default, __USE_GNU is defined. If you want to define it
> (perhaps you meant "...is undefined"???)
>     Ben> explicitly, then use -D_GNU_SOURCE in your CFLAGS.
> It doesn't seem to be the case here:
> > gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../include    -g -O2 -Wall -c -o main.o main.c        
> main.c: In function `xmlparse_file':
> main.c:14: warning: implicit declaration of function `asprintf'
> >gcc -DHAVE_CONFIG_H -I. -I. -I.. -I../include    -g -O2 -D_GNU_SOURCE -Wall -c -o main.o main.c
> [no warnings]
> So it looks like I have to define _GNU_SOURCE explicitly in order to
> get rid of the warning.

No, __USE_GNU is defined, unless one of the other _XXX_SOURCE macros are
also defined (like _SVID_SOURCE or _XOPEN_SOURCE, or similar). Most
likely the program you are compiling is defining one of these aswell. In
that case, yes, you do have to define _GNU_SOURCE explicitly.

/  Ben Collins  --  ...on that fantastic voyage...  --  Debian GNU/Linux   \
`  bcollins@debian.org  --  bcollins@openldap.org  --  bcollins@linux.com  '

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