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Date: Fri, 27 Nov 2015 16:23:07 +0000
From: Bruce Richardson <bruce.richardson@intel.com>
To: David Marchand <david.marchand@6wind.com>
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Subject: Re: [dpdk-dev] [PATCH 7/7] mk: Add hierarchy-file support (linux
	mod)
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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.

/Bruce