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Date: Fri, 27 Nov 2015 16:48:53 +0000
From: Ferruh Yigit <ferruh.yigit@intel.com>
To: Bruce Richardson <bruce.richardson@intel.com>
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Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 7/7] mk: Add hierarchy-file support
	(linux	mod)
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On Fri, Nov 27, 2015 at 04:23:07PM +0000, Bruce Richardson wrote:
> On Fri, Nov 27, 2015 at 05:20:43PM +0100, David Marchand wrote:
> > On Fri, Nov 27, 2015 at 5:01 PM, Ferruh Yigit <ferruh.yigit@intel.com>
> > wrote:
> > 
> > > As far as I know only "?=" assignment overridden by command line.
> > >
> > > Basic experiment:
> > >
> > > # cat Makefile
> > > A ?= a
> > > B := b
> > > C = c
> > >
> > > all:
> > >         @echo $(A) $(B) $(C)
> > >
> > > -----
> > >
> > > # make
> > > a b c
> > >
> > > # A=x B=x C=x make
> > > x b c
> > >
> > 
> > Those variables are passed through env, but if you give them to make.
> > 
> > $ make A=x B=x C=x
> > x x x
> > 
> >
> You just beat me to it! ?= can be overridden by either environment or cmdline, others
> are overridden just by cmdline, which means they are passed to make, not to the
> shell.
> 
I see, thanks for clarification.

ferruh