Date: Wed, 9 Apr 2008 18:44:35 +0100 From: RW <fbsd06@mlists.homeunix.com> To: freebsd-questions@freebsd.org Subject: Re: Setting CPUTYPE and CFLAGS in make.conf Message-ID: <20080409184435.3bb4b91c@gumby.homeunix.com.> In-Reply-To: <2daa8b4e0804081314o25b9773bn844734b674856e8c@mail.gmail.com> References: <2daa8b4e0804081314o25b9773bn844734b674856e8c@mail.gmail.com>
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On Tue, 8 Apr 2008 13:14:45 -0700 "David Allen" <the.real.david.allen@gmail.com> wrote: > The advice I've read in several posts on the subject involve > everything from setting one, setting both, to ignoring both, > sometimes with the =? notation and sometimes without. And then, I've > read comments that suggest when compiling the kernel, for example, > both are ignored, and default values (tucked away somewhere) are > always applied. IIRC, the handbook recommends at least setting > CPUTYPE. Avoid setting CFLAGS unless you have a good reason - Gentoo documentation has a lot to answer for. CPUTYPE causes "-march" to be applied, so it can affect compatibility. AFAIK both setting do affect world and kernel because CFLAGS can cause a build to fail, and I've seen matching march settings in kernel builds. > Or are those settings relevant to the > compilation process only? Or to both the compilation process and the > actual performance of the binary? It can be either, -O2 is related to execution, -pipe speeds-up compilation.
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