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Date:      Tue, 20 Nov 2007 17:14:49 +1100 (EST)
From:      Bruce Evans <brde@optusnet.com.au>
To:        Heikki Suonsivu <hsu@bbnetworks.net>
Cc:        freebsd-bugs@freebsd.org, FreeBSD-gnats-submit@freebsd.org
Subject:   Re: kern/118121: RELENG_7 kernel compile fails with -Os
Message-ID:  <20071120171444.U820@besplex.bde.org>
In-Reply-To: <200711190511.lAJ5BFdh020851@joutseno.wlansystems.com>
References:  <200711190511.lAJ5BFdh020851@joutseno.wlansystems.com>

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On Mon, 19 Nov 2007, Heikki Suonsivu wrote:

>> Description:
>
> 	When compiling kernel with -Os, gcc apparently finds some new
> 	possible warnings (possible uninitialized variables, etc).  This exits
> 	kernel compile.  -O2 does not trigger these.
>
> 	scsi_sa and scsi_ses were among the offending files, but there
> 	may be more.

-Os is also a large negative optimization (it increases size by about 50%)
in RELENG_7 (or probably just with gcc-4), due to bogus inlining flags.

Bruce




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