Date: Sun, 27 Jul 2003 18:50:50 -0700 From: Steve Kargl <sgk@troutmask.apl.washington.edu> To: Jun Kuriyama <kuriyama@imgsrc.co.jp> Cc: Current <freebsd-current@freebsd.org> Subject: Re: dereferencing type-punned pointer will break strict-aliasing rules Message-ID: <20030728015050.GA77047@troutmask.apl.washington.edu> In-Reply-To: <7mvftnv3fp.wl@black.imgsrc.co.jp> References: <7mwue3v6gf.wl@black.imgsrc.co.jp> <7mvftnv3fp.wl@black.imgsrc.co.jp>
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On Mon, Jul 28, 2003 at 10:35:22AM +0900, Jun Kuriyama wrote: > At Mon, 28 Jul 2003 00:30:35 +0000 (UTC), > kuriyama wrote: > > Is this caused by -oS option? > > Grrr, of course this should be s/-oS/-Os/. > > These warnings are caused from DROP_GIANT() macro. By tracking this > down, actual source is __PCPU_GET() macro (line: 115) in > sys/i386/include/pcpu.h. > > __result = *(__pcpu_type(name) *)&__i; > snip > > What should we do? > I presume you read share/example/make.conf, which states # To compile just the kernel with special optimizations, you should use # this instead of CFLAGS (which is not applicable to kernel builds anyway). # There is very little to gain by using higher optimization levels, and doing # so can cause problems. # #COPTFLAGS= -O -pipe Notice the last 6 words. -- Steve
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