From: Michal Marek <mmarek@suse.cz>
To: Sam Ravnborg <sam@ravnborg.org>
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 13:00:45 +0200 [thread overview]
Message-ID: <5396E55D.8000202@suse.cz> (raw)
In-Reply-To: <20140610095016.GA5528@ravnborg.org>
On 2014-06-10 11:50, Sam Ravnborg wrote:
>>
>> 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.
I see. But do we want to encourage people to change the value? IMO There
should be some "change this variable only if you know what you are
doing" warning.
Michal
next prev parent reply other threads:[~2014-06-10 11:00 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
2014-06-10 11:00 ` Michal Marek [this message]
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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