From mboxrd@z Thu Jan  1 00:00:00 1970
From: greg@kroah.com (Greg KH)
Date: Thu, 15 Mar 2018 17:26:45 +0100
Subject: Out-of-tree module build in a dedicated build directory.
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Message-ID: <20180315162645.GA2450@kroah.com>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org

On Thu, Mar 15, 2018 at 11:27:05AM -0400, Aruna Hewapathirane wrote:
> On Thu, Mar 15, 2018 at 10:52 AM, Aruna Hewapathirane <
> aruna.hewapathirane at gmail.com> wrote:
> 
> > <snip>
> >
> >>
> >> But the issue remain the same:
> >> $ make
> >> make -C /home/lexa/linux M=/home/lexa/module
> >> O=/home/lexa/module/build_x86 modules
> >> make[1]: Entering directory '/home/lexa/linux'
> >> make[2]: Entering directory '/home/lexa/module/build_x86'
> >>
> >>   WARNING: Symbol version dump ./Module.symvers
> >>            is missing; modules will have no dependencies and modversions.
> >>
> > <snip>
> >
> > Please run make modules from the top level directory of your source tree
> > and and then module.symvers will be generated.
> >
> >
> If for some reason make modules did not create module.symvers then try:
> 
>         cd /home/lexa/linux
>         make
>         [wait a few minutes as it builds some scripts and starts building
> kernel code...]
>         hit <Ctrl-C>
> 
> then go back and try building your module.

'make modules_prepare' should do the same thing.

'make help' shows all of this, but who ever reads documentation :)