Re: Cross OS version UB development
Re: Cross OS version UB development
- Subject: Re: Cross OS version UB development
- From: Shawn Erickson <email@hidden>
- Date: Sat, 24 Feb 2007 09:14:40 -0800
On Feb 24, 2007, at 9:03 AM, John Daniel wrote:
On Feb 24, 2007, at 10:44 AM, Shawn Erickson wrote:
On Feb 24, 2007, at 8:31 AM, John Daniel wrote:
On Feb 24, 2007, at 9:52 AM, Theodore H. Smith wrote:
Hi people,
What's the earliest OS I can cross compile for OS versions?
Right now I'm using these settings.
SDKROOT = /Developer/SDKs/MacOSX10.3.9.sdk
MACOSX_DEPLOYMENT_TARGET_i386 = 10.4
SDKROOT_i386 = /Developer/SDKs/MacOSX10.4u.sdk
Now, what if I wanted to let PPC users run my library on MacOS
10.2? Is this possible? Whats the earliest OS I can cross
compile for? I'd rather know than test it out for myself because
I don't actually have MacOS10.2 or 10.1 or 10.0 installed.
It is probably safer to create two targets in your project, one
for Intel only (using 10.4) and one for PPC (10.2) and meld them
together using lipo in a 3rd target that has only a run script
build phase.
Why? Xcode supports building a UB directly for you (by default
Release configuration does this while Debug only build the
platform you are running on). You don't need to make it harder on
yourself. This capability works fine so I suggest you use it.
Because I'm not an Xcode wizard.
You don't have to be.
It is all documented and discoverable in Apple's online documentation
and via Xcode documentation feature. Personally I try never to use a
feature without taking 10 minutes to review relevant documentation...
doing so you often can avoid doing extra work that may not be needed.
For example a section of the document that discusses cross
development fully covers this capability.
<http://developer.apple.com/documentation/DeveloperTools/Conceptual/
cross_development/UniversalBinaries/chapter_4_section_1.html>
...or if you come at this from the Universal Binary Programming Guide
you see the following note in a little callout box and links to the
above...
"Note: Xcode has per-architecture SDK support. For example, you can
target Mac OS X versions 10.3 and 10.4 for PowerPC while also
targeting Mac OS X v10.4 and later for Intel-based Macintosh computers."
-Shawn
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