Date: Fri, 12 Dec 2003 15:12:57 -0600 From: Jon Noack <noackjr@alumni.rice.edu> To: toxa <postfix@sendmail.ru> Cc: freebsd-current@freebsd.org Subject: Re: CURRENT state of acpi and -O'ptimisations in buildworld Message-ID: <3FDA2F59.3060009@alumni.rice.edu> In-Reply-To: <200312121823.22352.postfix@sendmail.ru> References: <200312121749.12408.postfix@sendmail.ru> <1071241208.970.49.camel@localhost> <200312121823.22352.postfix@sendmail.ru>
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On 12/12/2003 9:23 AM, toxa wrote: > On Friday 12 December 2003 18:00, Ryan Sommers wrote: > > >>>The second is about buildworld. Usually I use this opimisaton flags to >>>build world and userland (putting them to /etc/make.conf): >>> >>>CFLAGS= -O3 -pipe -ffast-math -funroll-loops -mno-sse2 -march=pentium4 >>>COPTFLAGS= -O2 -pipe -march=pentium4 -ffast-math -funroll-loops >>>CPUTYPE= p4 >> >>Building with any optimization higher then -O is not supported. > > > Does it mean that -O3 really translated into -O then making buildworld OR that > with any optimisation higher than -O you may have _success_ with buildworld > BUT binaries may be _broken_? I have used -O2 and -O3 with 5-CURRENT for many > months (cvsuping to -current since 5.1-release) without any problem until > tonight. > > Thanks for your reply. They are not translated to -O -- they simply may not work (as you have seen). The following are excerpts from /etc/defaults/make.conf. On CFLAGS: "Note that optimization settings above -O (-O2, ...) are not recommended or supported for compiling the world or the kernel - please revert any nonstandard optimization settings to "-O" before submitting bug reports to the developers." On COPTFLAGS: "There is very little to gain by using higher optimization levels, and doing so can cause problems." Jon Noack
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