Re: make-4.0 allows empty ARFLAGS to be passed to ar

[Ken Moffat]

On Mon, Oct 21, 2013 at 01:11:47PM -0400, Paul Smith wrote:
> On Mon, 2013-10-21 at 18:03 +0100, Ken Moffat wrote:
> > 2. Unfortunately, rules.mak *is* adding -rR to the MAKEFLAGS -
> > 
> > # Don't use implicit rules or variables
> > # we have explicit rules for everything
> > MAKEFLAGS += -rR
> 
> >  I'll attach rules.mak.  Is this a qemu bug which just happened to
> > work in make-3.82, or a make problem ?
> 
> It's a qemu bug, that just happened to work with make-3.82.  By adding
> the -R flag they are stating they don't want to use ANY default variable
> values.  However they are relying on the default variable value for
> ARFLAGS to be set.  If they want to use -R they should set ARFLAGS to an
> acceptable value in their makefile.
> 
> In previous versions of GNU make adding those flags wouldn't take effect
> in the current instance of make; it would only be in effect in a
> sub-make; that bug/mis-feature was fixed in GNU make 4.0.  Now adding
> those flags in a makefile takes effect immediately, within that same
> instance of make.  From the NEWS for GNU make 4.0:
> 
> * Setting the -r and -R options in MAKEFLAGS inside a makefile now works as
>   expected, removing all built-in rules and variables, respectively.

 Thanks.  Is it OK if I quote this whole reply to the qemu devs ?

PS - I've now got your second mail, it obviously came by the slow
route.

ĸen
-- 
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