linux-kernel - Re: Allow (O=...) from file

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Message-ID: <20071205213126.43548ccf@osprey.hogchain.net>
Date:	Wed, 5 Dec 2007 21:31:26 -0600
From:	Jay Cliburn <jacliburn@...lsouth.net>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Allow (O=...) from file

On Wed, 5 Dec 2007 22:00:03 +0100
Sam Ravnborg <sam@...nborg.org> wrote:

> On Tue, Dec 04, 2007 at 09:04:33PM -0600, Jay Cliburn wrote:
> > Sam,
> > 
> > This piece of the top-level Makefile in current git causes an
> > out-of-tree driver Makefile to fail.
> > 
> > 101 ifdef O
> > 102   ifeq ("$(origin O)", "command line")
> > 103     KBUILD_OUTPUT := $(O)
> > 104   endif
> > 105 endif
> > 
> > The out-of-tree driver Makefile contains an O=... directive that
> > (correctly) does _not_ specify the kernel source dir, and apparently
> > isn't overridden by the command line either. If in the above
> > Makefile snippet I change "command line" to "file", my out-of-tree
> > make succeeds. What do you think about allowing O= to come from a
> > file in addition to the command line?
> 
> When you change "command line" to "file" you actually makes kbuild
> ignore the O=... value which is why it succeeds.

I'm puzzled by your statement.  Isn't the opposite true?  When using
"command line", doesn't the following happen?

1. My makefile sets O=/foo
2. My makefile invokes your makefile with O=/foo
3. Your makefile ignores my O=/foo because it requires O=/foo to
originate from the command line
4. KBUILD_OUTPUT never gets set to /foo and we hit the error

OTOH, if I use "file":
1. My makefile sets O=/foo
2. My makefile invokes your makefile with O=/foo
3. Your makefile accepts my O=/foo because it requires O=/foo to
originate from another makefile
4. KBUILD_OUTPUT gets set to /foo and my make succeeds

This all used to work the last time I tried it, which was sometime
during 2.6.23 development, IIRC.  Isn't the current structure going to
break just about all out-of-tree driver builds?

Jay
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