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From: Sam Ravnborg <sam@ravnborg.org>
To: Michal Marek <mmarek@suse.cz>
Cc: Masahiro Yamada <yamada.m@jp.panasonic.com>,
	linux-kbuild@vger.kernel.org
Subject: Re: [PATCH] kbuild: document KBUILD_SHELL
Date: Tue, 10 Jun 2014 11:50:17 +0200	[thread overview]
Message-ID: <20140610095016.GA5528@ravnborg.org> (raw)
In-Reply-To: <5396CF99.1070309@suse.cz>

> 
> The variable is assinged with a ":=", not a "?=", so you can't change it
> from outside, can you?

Variables assigned with ":=" can be changed like this:

$ cat Makefile
FOO := fisk
$(info FOO=$(FOO))
all:
	@:

$ FOO=bar make
FOO=fisk

$ make FOO=bar
FOO=bar


The first is the same as using an environment variable.
The latter is a special make syntax.

	Sam

  reply	other threads:[~2014-06-10  9:50 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-06-10  2:51 [PATCH] kbuild: document KBUILD_SHELL Masahiro Yamada
2014-06-10  9:27 ` Michal Marek
2014-06-10  9:50   ` Sam Ravnborg [this message]
2014-06-10 11:00     ` Michal Marek
2014-06-10 11:17       ` Masahiro Yamada
2014-06-10 11:36         ` Michal Marek
2014-06-10 12:02           ` Masahiro Yamada
2014-06-10 12:22             ` Michal Marek
2014-06-10 12:55               ` Masahiro Yamada
2014-06-26  2:02               ` Masahiro Yamada
2014-07-04 22:01                 ` Michal Marek
2014-06-10 19:56           ` Sam Ravnborg

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