out-of-tree build with external module

out-of-tree build with external module

[Tino Mettler]

Hi,

I want to build an external module out-of-tree. I tried this:

make -C <kernel-source> KBUILD_OUTPUT=<out-of-tree-path> M=<external-module> modules

However, the result is put to the source path specified by M=, whereas a
normal kernel build (without M=) but otherwise same parameters puts the
result to <out-of-tree-path>.

Any hints what I'm doing wrong?

Regards,
Tino

Re: out-of-tree build with external module

[dvomlehn]

On 11/18/2015 06:46 AM, Tino Mettler wrote:
> Hi,
>
> I want to build an external module out-of-tree. I tried this:
>
> make -C <kernel-source> KBUILD_OUTPUT=<out-of-tree-path> M=<external-module> modules
>
> However, the result is put to the source path specified by M=, whereas a
> normal kernel build (without M=) but otherwise same parameters puts the
> result to <out-of-tree-path>.
>
> Any hints what I'm doing wrong?
>
> Regards,
> Tino
>
>
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When building a module out of tree, I set up a directory in which the 
source and Make file reside. I don't use KBUILD_OUTPUT and set M to 
$$PWD. I do the build in the directory specified by M and the result is 
put in that directory. This is pretty much exactly what is defined in 
the Kbuild documentation in kbuild/modules.txt (see the examples in 
sections 3.1-3.3). Are you looking for something else?

-- 
David VL

Re: out-of-tree build with external module

[Michal Marek]

On 2015-11-18 15:46, Tino Mettler wrote:
> Hi,
> 
> I want to build an external module out-of-tree. I tried this:
> 
> make -C <kernel-source> KBUILD_OUTPUT=<out-of-tree-path> M=<external-module> modules
> 
> However, the result is put to the source path specified by M=, whereas a
> normal kernel build (without M=) but otherwise same parameters puts the
> result to <out-of-tree-path>.

The combination of M= and O= is not supported by kbuild.

Michal