For iBook G3, are there better mcpu and mtune flags?

cayenne · l33t Joined: 17 Oct 2002 Posts: 945 Location: New Orleans

Hello all,

I"m working on putting Gentoo on an old iBook G3 to try to breathe some new life into it.

I'm looking at the manual, and the example has -mcpu=powerpc and -mtune=powerpc

Is there a more specific flag that can be set for the G3 on my laptop? It is old and likely could use all the help it can get for compiling.
I"m starting with stage3 and then doing the bootstrap...so, everything will be optimized as much as possible.

In the manual, it said examples could be found in /etc/make.conf/example, but I don't see that file anywhere around.

Any suggestions for these....any other good thing to put in there for squeezing as much as I can out an old computer that has worked well for me for years....?

Thanks in advance,

cayenne
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cayenne · l33t Joined: 17 Oct 2002 Posts: 945 Location: New Orleans

Wow...forgot that I'd tried doing a dual boot on this thing way back in 2006..and I'd asked a similar question.

https://forums.gentoo.org/viewtopic-t-213425-highlight-cayenne+mcpu.html

Looking like in the past it for the G3 it was -mcpu=750 -mtune=750

I'd assume this would still be the setting for today?

Also, seeing some other suggestions and I'm not sure what they do...

-mpowerpc-gfxopt
-fno-strict-aliasing
-mmultiple
-mstring
-ftracer

And I even saw this:

CXXFLAGS="${CFLAGS} -fvisibility-inlines-hidden"
LDFLAGS="-Wl,-O1 -Wl,--enable-new-dtags -Wl,--sort-common -s"

I've never seen anyone add anything to CXXFLAGS before..usually just set to the same as CFLAGS...and I've not heard of the
LDFLAGS before?

Any insight on these?

TIA,

cayenne :?:

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mattst88 · Developer Joined: 28 Oct 2004 Posts: 422

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JoseJX · Retired Dev Joined: 28 Apr 2002 Posts: 2774

Using 750 or G3 would work fine. The other options are not required and are implied (as needed) by 750 or G3.

LDFLAGS are passed to the linker. By default, you'll already have -Wl,-O1. You may want to try using -Wl,--as-needed, I use it on my development laptop with no real issues and it does reduce the number of libraries linked into binaries. Be careful when trying these sorts of options, it's easy to find a combination that breaks things, unless that's the point! :)
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Gentoo PPC FAQ: http://www.gentoo.org/doc/en/gentoo-ppc-faq.xml