James <[EMAIL PROTECTED]>
Enviado por: news <[EMAIL PROTECTED]>
24/01/2008 17:00
Por favor, responda a gentoo-user
Para: gentoo-user@lists.gentoo.org
cc:
Asunto: [gentoo-user] Re: firewall make.conf settings
<tecnic5 <at> silvanoc.com> writes:
>If you'd like to use the same make.conf for different machines you should
>make sure they all have same processors or, at least, same family of >
>processors; in your case, I recommend using -mcpu instead of -march. Keep
>in mind that K6 processors have their own -marc=k6 and might not be
>comptable with -march=i586. More in /etc/make.conf.example.
Good point:
-mcpu is deprecated, according to the examples file as of gcc 3.4, SO:
CFLAGS="-Os -march=i586 -pipe -fomit-frame-pointer"
CHOST="i586-pc-linux-gnu"
changed to:
CFLAGS="-Os -mtune=i586 -pipe -fomit-frame-pointer"
or
CFLAGS="-Os -march=i586 -mtune=i586 -pipe -fomit-frame-pointer"
<????? Remember I want one set of binaries for both k6 and old pentiums>
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You're right, make it -mtune ;-). On the other hand, and according to
Gentoo GCC optimization guide[1], both -mtune and -mcpu only take effect
if there is no -march available, so I guess the later takes preference
over the former. I'd use the first option of CFLAGS, hence.
[1] http://www.gentoo.org/doc/en/gcc-optimization.xml#doc_chap2
HTH,
Abraham Marín
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