linux-kernel - Re: [PATCH 1/3] arch/um/Makefile: remove dead code

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Message-ID: <CALkWK0mcK13RiVjNCrgwEaaL3nBZ1W0R5+cHAhbqiOmRE4UjAg@mail.gmail.com>
Date:	Fri, 5 Jul 2013 16:12:30 +0530
From:	Ramkumar Ramachandra <artagnon@...il.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Richard Weinberger <richard@....at>,
	Jeff Dike <jdike@...toit.com>
Subject: Re: [PATCH 1/3] arch/um/Makefile: remove dead code

Al Viro wrote:
> [...]
> IOW, any make variable (== macro in POSIX quote above) can be explicitly
> set in make(1) command line in form name=value and in that case nothing in
> makefile(s) can change its value.  It's true for GNU make, it's true for
> BSD make and it's been true for historical Unix make since its introduction
> in v7.

Thanks Al, the education is much appreciated.  I always thought =
would override it, and ?= was for default value.
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