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?
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