Re: Why do PPC Tiger apps run on a Mactel Leopard system? [from an Xcode perspective]
Re: Why do PPC Tiger apps run on a Mactel Leopard system? [from an Xcode perspective]
- Subject: Re: Why do PPC Tiger apps run on a Mactel Leopard system? [from an Xcode perspective]
- From: Rick Altherr <email@hidden>
- Date: Tue, 8 Jul 2008 14:20:32 -0700
On Jul 8, 2008, at 2:13 PM, John F. Richardson wrote:
Hello,
Every now and then I use Xcode but I have a newbie type question.
I recently used setup assistant to transfer the applications folder
(and
other associated folders) from a PPC architecture running Tiger
10.4.8 to a
Leopard 10.5.2 Intel architecture.
So, I have tried a reasonable number of my apps by double clicking
them...
...And they execute and seem to fully initialize. Not all functions
have
been exercised but I am quite pleased with Tiger PPC to Leopard Intel
forward compatibility.
So, are the apps just running in some sort of compatibility mode? For
instance Graphic Converter has an about box that mentions CFM and
PPC but it
seems to behave nicely. Get info on most of the working apps does
not list
(Universal). If this is not the case, what is the Xcode reason for
such
success.
Could someone list a URL for such a compatibility mode
documentation. Is the
phrase" compatibility mode" even a legitimate Xcode concept and if
not, what
is the correct phrase for such forward compatibility behavior? Just
asking a
few questions before I load the developer tools and start reading the
manual.
Note: as a reward for actually running, I would like to give kudos
to Google
Earth, Software McKiev, Zbush (pixologic), Blender foundation,
Lemkesoft,
Starry Night, SuperCard, Bryce 5, LightWave9,...
John F. Richardson
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Rosetta is what you are looking for. It's a technology that allows
PPC binaries to run on Intel machines. There is no related settings
in Xcode since it has nothing to do with how the application is built
(other than being built for PPC only). In general, any PPC binary
will run on Intel machines through Rosetta, but they will suffer a
performance penalty. A native Intel version of the same application
will be faster.
--
Rick Altherr
Architecture and Performance Group
email@hidden
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