From: wbin00@gmail.com (Bin Wang)
To: kernelnewbies@lists.kernelnewbies.org
Subject: When does Makefile init the variables like KBUILD_OUTPUT
Date: Fri, 18 Jan 2013 10:42:51 +0800 [thread overview]
Message-ID: <50F8B6AB.4030709@gmail.com> (raw)
In-Reply-To: <50F76155.3000506@gmail.com>
On 2013/01/17/ 10:26, Bin Wang wrote:
> Hi, all
>
> The kernel Makefile init the variables like KBUILD_OUTPUT outside any
> target's make process. But when I try to output the KBUILD_OUTPUT in
> the target's make process, for example, the target "help", I find it
> is not defined. I want to know when will it init? Thanks a lot
However, when I just write a Makefile with this:
|ifeq ("$(origin O)", "command line")
KBUILD_OUTPUT := $(O)
endif
help:
@echo 'KBUILD_OUTPUT: ${KBUILD_OUTPUT}'
|
Then I run|make O=../build help|, I will see|KBUILD_OUTPUT: ../build|.
Is there anything special in kernel's Makefile?
prev parent reply other threads:[~2013-01-18 2:42 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-17 2:26 When does Makefile init the variables like KBUILD_OUTPUT Bin Wang
2013-01-18 2:42 ` Bin Wang [this message]
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