linux-kernel - Re: tinyconfig x86-32 vmlinux sizes by gcc compiler version

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Message-ID: <20141204222521.GA20091@cloud>
Date:	Thu, 4 Dec 2014 14:25:21 -0800
From:	josh@...htriplett.org
To:	Joe Perches <joe@...ches.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: tinyconfig x86-32 vmlinux sizes by gcc compiler version

On Thu, Dec 04, 2014 at 01:32:59PM -0800, Joe Perches wrote:
> Just fyi.
> 
> At least for x86-32, it seems later versions of gcc
> are producing smaller images.
> 
> $ size vmlinux.*
>    text	   data	    bss	    dec	    hex	filename
>  657725	 118496	1189040	1965261	 1dfccd	vmlinux.4.4
>  633563	 118528	1189448	1941539	 1da023	vmlinux.4.6
>  633277	 118496	1189592	1941365	 1d9f75	vmlinux.4.7
>  632299	 121120	1192784	1946203	 1db25b	vmlinux.4.9

I would certainly hope that GCC's -Os gets better over time.  However, I
find the increase in data/bss and thus overall size in 4.9 concerning.
Any idea what that comes from?

- Josh Triplett
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