Re: [LTP] [PATCH] clone/clone08.c: check whether clone supports 7 arguments

[Mike Frysinger <vapier@gentoo.org>]

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On Thursday 09 January 2014 08:23:48 Jan Stancek wrote:
> ----- Original Message -----
> 
> > From: "Mike Frysinger" <vapier@gentoo.org>
> > To: ltp-list@lists.sourceforge.net
> > Sent: Thursday, 9 January, 2014 2:03:38 PM
> > Subject: Re: [LTP] [PATCH] clone/clone08.c: check whether clone supports
> > 7	arguments
> > 
> > On Wednesday 08 January 2014 09:31:30 Zeng Linggang wrote:
> > > +AC_DEFUN([LTP_CHECK_CLONE7ARGS],[
> > > +AH_TEMPLATE(HAVE_CLONE7ARGS,
> > > +[Define to 1 if clone() supports 7 arguments.])
> > > +AC_MSG_CHECKING([for CLONE7ARGS])
> > > +AC_TRY_LINK([#define _GNU_SOURCE
> > > +		#include <sched.h>
> > > +		#include <stdlib.h>],
> > > +		[
> > > +		#if !defined(__ia64__)
> > > +		clone(NULL, NULL, 0, NULL, NULL, NULL, NULL);
> > > +		#endif
> > > +		],
> > > +		AC_DEFINE(HAVE_CLONE7ARGS) AC_MSG_RESULT(yes), AC_MSG_RESULT(no))
> > > +])
> > 
> > you aren't really testing for "clone takes 7 args", you're testing for
> > "clone has varargs support".  rename the define (and use _ in its name),
> > and drop the
> > ia64 check as it isn't needed.
> 
> Why not? It should matter, according to clone(2) you should be using
> __clone2() on ia64: ia64
>        On ia64, a different interface is used:

exactly.  why does a clone() test have any bearing at all on ia64 behavior ?  
the code that checks the define won't get used in the __ia64__ case, so having 
a define here is pointless.
-mike

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