When does Makefile init the variables like KBUILD_OUTPUT
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. Bin Wang
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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Bin Wang