linux-kernel - Re: Difficulties around "fixdep" for the usage of a kernel build output directory

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Date:   Tue, 18 Oct 2016 18:38:22 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Jim Davis <jim.epost@...il.com>
Cc:     linux-kbuild@...r.kernel.org, Michal Marek <mmarek@...e.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Difficulties around "fixdep" for the usage of a kernel build
 output directory

>> elfring@...ne:~/Projekte/Linux/next-patched> my_off=-O0 && for X in off; do my_output_dir=${my_build_dir}unchanged/optimisation/${X} && my_var="my_${X}" && my_parameters="-Wall -std=gnu89 -fomit-frame-pointer ${!my_var}" && LANG=C make V=2 O="${my_output_dir}" HOSTCC='/usr/bin/gcc-6' HOSTCFLAGS="-S ${my_parameters}" drivers/md/; done
…
> That's a very complicated command line.

I find it "advanced".

It shows a few of my imaginations around a specific software development task.

> Does something basic, like
> 
> make O=/tmp/$$ allmodconfig
> make O=/tmp/$$
> 
> work for you?

Not really. - I would like to achieve the automatic selection of a few
compilation settings by a for loop which I reduced in the shown example
to one element.

I am looking for a "convenient" way to get assembler source files from
the preferrred C compiler for some software build configurations.
I hope that I can avoid the switching of compilation results in the source
file directory hierarchy so that an occasional disassembly by a tool
like "objdump" could be compared.

Regards,
Markus