Date: Fri, 25 May 2007 16:02:47 +0200 From: Stefan Ehmann <shoesoft@gmx.net> To: freebsd-current@freebsd.org Cc: Roman Divacky <rdivacky@freebsd.org> Subject: Re: size of kernel after gcc4.2 upgrade Message-ID: <200705251602.48778.shoesoft@gmx.net> In-Reply-To: <20070525095146.GA45288@freebsd.org> References: <20070525095146.GA45288@freebsd.org>
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On Friday 25 May 2007 11:51:46 Roman Divacky wrote: > hi > > I just noticed that > spravci ~# ls -l /boot/kernel*/kernel > -r-xr-xr-x 1 root wheel 3389971 May 18 12:03 /boot/kernel.old/kernel* > -r-xr-xr-x 1 root wheel 5211345 May 25 11:47 /boot/kernel/kernel* > > ie. after gcc42 import the kernel size increased roughly by 60% thats > a little too much. is there any forgotten option or something that > makes the kernel grow so big? While I also see an increase, it's not that much. GENERIC from today's current, also compiled with gcc34 from ports (I had to delete two gcc options in sys/conf/kern.mk): gcc34: 6530916 gcc42: 7352560 gcc34 -Os: 6074468 gcc42 -Os: 10058032 That -Os produces a much larger kernel image looks worrying. Can anyone confirm this? I used make COPTFLAGS="-Os -pipe" buildkernel. For comparision, a stripped (uncompressed) debian unstable kernel (2.6.20): gcc 3.4: 2655188 gcc 4.2: 2595948 It seems the kernel is compiled with -Os by default. with -O2: gcc 3.4: 3036116 gcc 4.2: 2956568 Stefan
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