linux-kernel - Re: Challenges around the usage of different "HOSTCFLAGS" for kernel build configuration and module generation

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Date:   Wed, 19 Oct 2016 17:03:47 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Jim Davis <jim.epost@...il.com>
Cc:     SF Markus Elfring <elfring@...rs.sourceforge.net>,
        linux-kbuild@...r.kernel.org, Michal Marek <mmarek@...e.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: Re: Challenges around the usage of different "HOSTCFLAGS" for kernel build configuration and module generation

On Wed, Oct 19, 2016 at 12:51:44PM -0700, Jim Davis wrote:
> On Wed, Oct 19, 2016 at 12:25 AM, SF Markus Elfring
> <elfring@...rs.sourceforge.net> wrote:
> >
> > Are you interested that a software generation parameter like "-S"
> > (for output of assembler source files) could be directly supported
> > for a special build variant?
> 
> No, if you want to see the assembly code then something like
> 
> make defconfig; make EXTRA_CFLAGS="-g" drivers/md/; objdump -S
> drivers/md/whatever.o
> 
> seems easy enough.  You could write a little shell wrapper to save
> some keystrokes if you find you're running those commands frequently.

Don't forget -r when running objdump on an object file.  But, you
want to use  make drivers/md/whatever.s  if you want to see the
assembler code.

And that doesn't work for build-time tools, which I think is what
the original discussion was about.


Segher