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Date: Mon, 8 Jun 2015 11:47:23 +0100
From: Bruce Richardson <bruce.richardson@intel.com>
To: Olivier MATZ <olivier.matz@6wind.com>
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Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] mk: remove "u" modifier from "ar" command
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On Mon, Jun 08, 2015 at 10:13:30AM +0200, Olivier MATZ wrote:
> Hi Bruce,
> 
> On 06/05/2015 01:05 PM, Bruce Richardson wrote:
> > On Fedora 22, the "ar" binary operates by default in deterministic mode,
> > making the "u" parameter irrelevant, and leading to warning messages
> > getting printed in the build output like below.
> > 
> >   INSTALL-LIB librte_kvargs.a
> > ar: `u' modifier ignored since `D' is the default (see `U')
> > 
> > There are two options to remove these warnings:
> > * add in the "U" flag to make "ar" non-deterministic again
> > * remove the "u" flag to have all objects always updated
> 
> Indeed, I think that removing 'u' won't have any impact in this case,
> as we always regenerate the full archive without updating it.
> However, why not explicitly use 'D' to have the same behavior across
> distributions?
> 
> Regards,
> Olivier
> 

Good question. I didn't bother adding in the "D" flag as I didn't see the need.
[Basically, I asked "why" instead of "why not" :-)]
However, if folks think it's worthwhile doing, I don't think doing a V2 of
this patch would tax me unduly :-)

/Bruce

> 
> > 
> > This patch takes the second approach.
> > 
> > Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> > ---
> >  mk/rte.lib.mk | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/mk/rte.lib.mk b/mk/rte.lib.mk
> > index 0d7482d..6bd67aa 100644
> > --- a/mk/rte.lib.mk
> > +++ b/mk/rte.lib.mk
> > @@ -70,7 +70,7 @@ else
> >  _CPU_LDFLAGS := $(CPU_LDFLAGS)
> >  endif
> >  
> > -O_TO_A = $(AR) crus $(LIB) $(OBJS-y)
> > +O_TO_A = $(AR) crs $(LIB) $(OBJS-y)
> >  O_TO_A_STR = $(subst ','\'',$(O_TO_A)) #'# fix syntax highlight
> >  O_TO_A_DISP = $(if $(V),"$(O_TO_A_STR)","  AR $(@)")
> >  O_TO_A_CMD = "cmd_$@ = $(O_TO_A_STR)"
> >