linux-kernel - Re: Easier way to generate stuff like asm-offsets.

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Message-ID: <20091121061006.GA13067@ellpspace.math.ualberta.ca>
Date:	Fri, 20 Nov 2009 23:10:06 -0700
From:	Michal Jaegermann <michal@...pspace.math.ualberta.ca>
To:	Kaz Kylheku <kkylheku@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Easier way to generate stuff like asm-offsets.

On Fri, Nov 20, 2009 at 04:56:14PM -0800, Kaz Kylheku wrote:
> 
> Here is the simple trick:
....
> 
> Now we compile test.c:
> 
> $ /path/to/toolchain/bin/arch-prefix-gcc test.c -c
> 
> Then we can use the ``nm'' tool (the toolchain should have binutils in it):
> 
> $ /path/to/toolchain/bin/arch-prefix-nm -t d -P foo.c   # decimal
> output, posix format
> offsetof_foo_member C 00000044 00000044
> 
> There we go, 44 bytes.  Simple.  This is almost an #include file;
> we just have to do some simple filtering, such as:
> 
> $ /path/to/toolchain/bin/arch-prefix-nm -t d -P test.o | awk '{ print "#define", $1, $4 }'
> #define offsetof_foo_member 00000044

If that is a "decimal output" then resulting define has a wrong format.
You do not want octal.  Fix that with
   ... | awk '{print "#define", $1, 0 + $4}'
to force a conversion of a string to a number.

   Michal
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