How to build an external module in a specified directory?

[Alexander Kapshuk]

On Mon, Jan 2, 2017 at 1:39 PM, Shiyao Ma <i at introo.me> wrote:
> Hi,
>
> When building an external module, for example, given this command,
> all:
>     $(MAKE) -C $(KDIR) M=$$PWD
>
> It will build the ko file in the $PWD.
>
> How to specify a location for the .ko files?
>
>
> Regards.
>
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Perhaps KBUILD_EXTMOD is what you're looking for.

/path/to/kernel/sources/Makefile:183,185
# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence