Date: Fri, 10 Mar 2000 13:28:38 -0500 From: "C J Michaels" <cjm2@earthling.net> To: <wsanborn@uswest.net>, <questions@FreeBSD.ORG> Subject: RE: Any major downside to using "-O3" when compiling? Message-ID: <NDBBILKDCLLECBCLPMBIKEANCAAA.cjm2@earthling.net> In-Reply-To: <38C1422B.16524.3085E0@localhost>
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I put -O3 in my /etc/make.conf probably 4 months ago, and have done several make world's with it and have had no problems. I am still err'ing on the side of caution with the kernel and have left that on -O2. As for performance increasing, I can't really say since I've never run any benchmarks between the 2. Also, from what I have read, anything over -O3 (e.g. -O4) is broken, do a search through the mailing list archives for more info. -Chris -----Original Message----- From: owner-freebsd-questions@FreeBSD.ORG [mailto:owner-freebsd-questions@FreeBSD.ORG]On Behalf Of wsanborn@uswest.net Sent: Saturday, March 04, 2000 8:05 PM To: questions@FreeBSD.ORG Subject: Any major downside to using "-O3" when compiling? After poking around the cc and gcc manpages, I noticed the "-O" option for optimization. I've now compiled a few items with that option and have noticed that: 1- It takes longer to compile (general resource hog. noticibly longer with -O3). 2- The binaries are larger (kernel size increased about %7) Is there any other downside? To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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