[Patches] Fix compiler warning on Linux

[Fredrik Lundh]

M.-A. Lemburg wrote:> > umm.  according to my copy of features.h, =
__USE_XOPEN is an
> > *internal* GNU-specific thingie.  any reason you cannot do this
> > in a portable way, and use
> >=20
> >     #define _XOPEN_SOURCE
> >=20
> > instead, just as the unix specifications say?
> >=20
> > (see GNU's features.h for a discussion of environment defines)
>=20
> Doesn't defining _GNU_SOURCE fix the above too ?

if you have a GNU compiler, sure.

but _XOPEN_SOURCE is a vendor-independent standard
(http://www.unix-systems.org).

maybe Python should set this variable on a system-wide
level?  after all, if the source code assumes X/Open API's,
explicitly saying so cannot really hurt...

    /* force susv2 compatibility, where available */
    #define _XOPEN_SOURCE 500

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