kern/118121: RELENG_7 kernel compile fails with -Os

Bruce Evans brde at
Tue Nov 20 02:10:03 PST 2007

The following reply was made to PR kern/118121; it has been noted by GNATS.

From: Bruce Evans <brde at>
To: Heikki Suonsivu <hsu at>
Cc: FreeBSD-gnats-submit at, freebsd-bugs at
Subject: Re: kern/118121: RELENG_7 kernel compile fails with -Os
Date: Tue, 20 Nov 2007 17:14:49 +1100 (EST)

 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.

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